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University of Zambia
1.
Shalwindi, Choolwe.
Exploring sustainable water resource management from synergies of the indigenous knowledge systems of the Toka Leya people of Zambia and integrated water resource management
.
Degree: 2014, University of Zambia
URL: http://hdl.handle.net/123456789/3221 
► Zambia’s ethnic groups have each developed indigenous practices and systems that make up their Indigenous Knowledge (IK). This IK has not been adequately documented nor…
(more)
▼ Zambia’s ethnic groups have each developed indigenous practices and systems that make up their Indigenous Knowledge (IK). This IK has not been adequately documented nor has it been used in modern approaches to natural resource conservation. IK is useful not only in managing water resources but also in ameliorating climatic variances that occur in form of droughts and floods. Such Indigenous Knowledge encompasses more than water resources management, it also takes into account other systems that play a role in the resources such as land use practices and trees. This study focused on exploring and documenting Toka Leya IK in relation to water resource management and establishing whether or not IK could be used in synergy with Integrated Water Resources Management and vice versa in the study area. The study analysed the Toka Leya IK in relation to water management and compared them to tenets of IWRM. The general research question posed in this study was: How can IK and IWRM be used in synergy to achieve sustainable water resources management among the Toka Leya of Chief Sekute? In order to achieve the research aim, specific research questions that were posed were: (1) What indigenous views are held by the Toka Leya of Chief Sekute’s Chiefdom about water? (2) Are the indigenous water practices of the Toka Leya people compatible with IWRM practices? (3) Is it feasible to incorporate the Toka Leya IK in IWRM and vice versa? Data collected was largely qualitative and hence its analysis was descriptive. The respondents were purposively sampled from the Chiefdom and Government offices directly involved in water and sanitation in the district. Key findings of the study were that the Toka Leya view water as a vulnerable and finite resource that should be conserved. The Toka Leya also use indigenous practices such as the use of flora to locate underground water sources and the basic principle of surface water retention after the wet season. There were rules and regulations that governed the abstraction and use of water resources that ensured sustainable use of the available water resources for the whole community. The rules and regulations also ensured the conservation of other natural resources such as flora more importantly riparian and high water table indicator trees. The conclusion of the study was that Toka Leya IK is indeed compatible with IWRM tenets. It is evident that Toka Leya IK has aspects that encourage participatory approach in water management. Women are not excluded from the management of water and water resources are not viewed as a free gift. Water is not considered as infinite in supply. As such the two approaches can be used in synergy to achieve sustainable water resources management in the study area. Key recommendations are that more future research be undertaken in IK along with botanical research that will validate the research findings that do not have scientific backing. Experts of IK, who are the indigenous people in any area, should be included during planning, implementation and monitoring of any…
Subjects/Keywords: Zambia-water resources-Management;
Water Resources
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APA (6th Edition):
Shalwindi, C. (2014). Exploring sustainable water resource management from synergies of the indigenous knowledge systems of the Toka Leya people of Zambia and integrated water resource management
. (Thesis). University of Zambia. Retrieved from http://hdl.handle.net/123456789/3221
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Shalwindi, Choolwe. “Exploring sustainable water resource management from synergies of the indigenous knowledge systems of the Toka Leya people of Zambia and integrated water resource management
.” 2014. Thesis, University of Zambia. Accessed January 24, 2021.
http://hdl.handle.net/123456789/3221.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Shalwindi, Choolwe. “Exploring sustainable water resource management from synergies of the indigenous knowledge systems of the Toka Leya people of Zambia and integrated water resource management
.” 2014. Web. 24 Jan 2021.
Vancouver:
Shalwindi C. Exploring sustainable water resource management from synergies of the indigenous knowledge systems of the Toka Leya people of Zambia and integrated water resource management
. [Internet] [Thesis]. University of Zambia; 2014. [cited 2021 Jan 24].
Available from: http://hdl.handle.net/123456789/3221.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Shalwindi C. Exploring sustainable water resource management from synergies of the indigenous knowledge systems of the Toka Leya people of Zambia and integrated water resource management
. [Thesis]. University of Zambia; 2014. Available from: http://hdl.handle.net/123456789/3221
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
2.
Suriya S.
Effect of land use change on flooding from integrated
water resources management (IWRM) perspective.
Degree: Civil engineering, 2014, Anna University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/15820
► Due to rapid urbanization and industrialization, the change in the land use pattern has resulted in irreversible anthropogenic disturbances to the hydrological processes. The increase…
(more)
▼ Due to rapid urbanization and industrialization,
the change in the land use pattern has resulted in irreversible
anthropogenic disturbances to the hydrological processes. The
increase in impervious area associated with urban development
affects the hydrologic cycle and consequently there is an enhanced
risk due to urban flooding. The increase in impermeable area
decreases infiltration, increases the runoff and reduces the time
of concentration. Hence, for a given amount of rainfall, greater
flooding is realized. Even though flood is a natural hydrological
phenomenon, human modification and new developments on flood plains
had accentuated the problem. This may be due to little attention
being paid to the social, political, environmental, ecological,
institutional, economical and legal aspects of flooding while more
emphasis is given to engineering aspects of flood control. The
focus of the research is to bring the hydrologic, hydraulic, social
and economic aspects of the flooding under the umbrella of
Integrated Flood Management (IFM) that aims to combine all the
characteristics of flooding and tries to give effective solution
for the problem. It also argues that flood management measures will
be successful if the policies are appropriate and adequate
attention is paid to social issues involving stakeholders in the
decision making process. The research aims to investigate the
impacts of land use changes on runoff generation process and the
problems associated with the flood management. In this study, Soft
Systems Methodology (SSM) was used to address social and
engineering problems arising due to flooding along Adayar River in
Chennai, India. Two workshops were conducted in order to define and
explore the problematic situation, the role of various actors
involved, to develop the conceptual model, to rank decision-making
criteria and to analyze the forces for and against the solution of
the problem. It is found from the study that the effect of flooding
tends to be severe due to formation of sand bar at the
river
References p. 219-236, List of publications p.
237-238, Vitae p. 239
Advisors/Committee Members: Mudgal B V.
Subjects/Keywords: Integrated water resources management; Water Resources
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APA (6th Edition):
S, S. (2014). Effect of land use change on flooding from integrated
water resources management (IWRM) perspective. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/15820
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
S, Suriya. “Effect of land use change on flooding from integrated
water resources management (IWRM) perspective.” 2014. Thesis, Anna University. Accessed January 24, 2021.
http://shodhganga.inflibnet.ac.in/handle/10603/15820.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
S, Suriya. “Effect of land use change on flooding from integrated
water resources management (IWRM) perspective.” 2014. Web. 24 Jan 2021.
Vancouver:
S S. Effect of land use change on flooding from integrated
water resources management (IWRM) perspective. [Internet] [Thesis]. Anna University; 2014. [cited 2021 Jan 24].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/15820.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
S S. Effect of land use change on flooding from integrated
water resources management (IWRM) perspective. [Thesis]. Anna University; 2014. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/15820
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
3.
Roussinova, Vesselina.
Turbulent structures in smooth and rough open channel flows:
effect of depth.
Degree: MA, Civil and Environmental
Engineering, 2009, National Library of Canada
URL: http://scholar.uwindsor.ca/etd/94
► In this thesis, detailed experiments are performed to study the effect of the flow depth on turbulent structures in smooth and rough bed open channel…
(more)
▼ In this thesis, detailed experiments are
performed to study the effect of the flow depth on turbulent
structures in smooth and rough bed open channel flow. When the
rough bed is introduced in the shallow flow, the local turbulence
near the roughness element intensifies and becomes highly
heterogeneous. The model roughness under study consists of a train
of two dimensional square ribs spanning the whole length of the
channel. The height of the ribs (k) occupy 10-15% of the depth of
flow (d) and falls in the category of large roughness. Velocity
measurements were conducted using laser Doppler velocimetry (LDV)
and particle image velocimetry (PIV) systems. While on the smooth
bed, mean velocity scaling in the classical logarithmic format was
confirmed from the present experiments, for the deep-flow cases,
turbulence quantities were found to be influenced by the free
surface. A modified length scale based on a region of constant
turbulence intensity is proposed to account for the effect of the
free surface. Two-dimensional PIV measurements were made in the
streamwise-wall normal plane of the smooth open channel flow at d =
0.10 m and Red = 21,000 to further study the influence of the free
surface on the turbulent structures. Proper orthogonal
decomposition (POD) and swirling strength analysis were employed to
investigate the structures present in the flow. Analysis of the POD
reconstructed velocity fields reveals the presence of large-scale
energetic structures near the free surface.
Advisors/Committee Members: Biswas, Niharendu (Civil & Environmental Engineering).
Subjects/Keywords: Water Resources Engineering.
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APA (6th Edition):
Roussinova, V. (2009). Turbulent structures in smooth and rough open channel flows:
effect of depth. (Masters Thesis). National Library of Canada. Retrieved from http://scholar.uwindsor.ca/etd/94
Chicago Manual of Style (16th Edition):
Roussinova, Vesselina. “Turbulent structures in smooth and rough open channel flows:
effect of depth.” 2009. Masters Thesis, National Library of Canada. Accessed January 24, 2021.
http://scholar.uwindsor.ca/etd/94.
MLA Handbook (7th Edition):
Roussinova, Vesselina. “Turbulent structures in smooth and rough open channel flows:
effect of depth.” 2009. Web. 24 Jan 2021.
Vancouver:
Roussinova V. Turbulent structures in smooth and rough open channel flows:
effect of depth. [Internet] [Masters thesis]. National Library of Canada; 2009. [cited 2021 Jan 24].
Available from: http://scholar.uwindsor.ca/etd/94.
Council of Science Editors:
Roussinova V. Turbulent structures in smooth and rough open channel flows:
effect of depth. [Masters Thesis]. National Library of Canada; 2009. Available from: http://scholar.uwindsor.ca/etd/94
4.
Faruque, Md. Abdullah Al.
Smooth and Rough Wall Open Channel Flow Including Effects of
Seepage and Ice Cover.
Degree: PhD, Civil and Environmental
Engineering, 2009, National Library of Canada
URL: http://scholar.uwindsor.ca/etd/403
► A comprehensive study was carried out to understand the effects of roughness, seepage and ice cover on the turbulence characteristics of flow in an open…
(more)
▼ A comprehensive study was carried out to
understand the effects of roughness, seepage and ice cover on the
turbulence characteristics of flow in an open channel. To this end,
tests were conducted with four different types of bed surface
conditions. This includes the use of an impermeable smooth bed,
impermeable rough bed, permeable sand bed and an impermeable bed
with distributed roughness. Both suction and injection seepage
tests were conducted covering a range of seepage rates. For the ice
cover tests, two different cover conditions were used. The tests
were conducted at two different Reynolds number (Re = 47,500 and
31,000). The bed roughness effect on the turbulence characteristics
is seen to have penetrated through most of the flow depth,
disputing the wall similarity hypothesis initially proposed by
Townsend (1976). The results show that the distributed roughness
shows the greatest roughness effect. Although the same sand grain
is used to create the different rough bed conditions, there are
differences in turbulence characteristics, which is an indication
that specific geometry of the roughness has an influence. Roughness
increases the contribution of the extreme turbulent events which
produces very large instantaneous Reynolds shear stress and can
potentially influence the sediment transport, resuspension of
pollutant from the bed and alter the nutrient composition, which
eventually affects the sustainability of benthic organisms. For the
tests with seepage, injection increases the magnitude of the
various turbulent characteristics and suction reduces the values in
comparison to no-seepage condition. Effect of seepage on different
turbulent characteristics is not restricted to the near-bed region
but can be seen through out the flow depth. The results from the
analysis of turbulent bursting events clearly show a distinct
effect of seepage well beyond the near-bed region. The introduction
of ice cover causes a change in mean velocity profile and increases
total resistance of the channel. The magnitude of this change
depends on both the bed and the cover roughness. The change in
turbulent characteristics seems to be bound to the upper half of
the flow and the changes can be significant with the rougher
cover.
Advisors/Committee Members: Balachandar, Ramaswami (Civil and Environmental Engineering).
Subjects/Keywords: Water Resources Engineering.
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Manager
APA (6th Edition):
Faruque, M. A. A. (2009). Smooth and Rough Wall Open Channel Flow Including Effects of
Seepage and Ice Cover. (Doctoral Dissertation). National Library of Canada. Retrieved from http://scholar.uwindsor.ca/etd/403
Chicago Manual of Style (16th Edition):
Faruque, Md Abdullah Al. “Smooth and Rough Wall Open Channel Flow Including Effects of
Seepage and Ice Cover.” 2009. Doctoral Dissertation, National Library of Canada. Accessed January 24, 2021.
http://scholar.uwindsor.ca/etd/403.
MLA Handbook (7th Edition):
Faruque, Md Abdullah Al. “Smooth and Rough Wall Open Channel Flow Including Effects of
Seepage and Ice Cover.” 2009. Web. 24 Jan 2021.
Vancouver:
Faruque MAA. Smooth and Rough Wall Open Channel Flow Including Effects of
Seepage and Ice Cover. [Internet] [Doctoral dissertation]. National Library of Canada; 2009. [cited 2021 Jan 24].
Available from: http://scholar.uwindsor.ca/etd/403.
Council of Science Editors:
Faruque MAA. Smooth and Rough Wall Open Channel Flow Including Effects of
Seepage and Ice Cover. [Doctoral Dissertation]. National Library of Canada; 2009. Available from: http://scholar.uwindsor.ca/etd/403
University of California – San Diego
5.
Manduley, Morgan.
Scene of Shipwreck.
Degree: Visual Arts, 2017, University of California – San Diego
URL: http://www.escholarship.org/uc/item/9vh8t0xt
► My MFA Thesis exhibition, Scene of Shipwreck, is a synthesis of my practice as both an object and exhibition maker. Centered around the narrative described…
(more)
▼ My MFA Thesis exhibition, Scene of Shipwreck, is a synthesis of my practice as both an object and exhibition maker. Centered around the narrative described by survivors Henri Savigny and Alexandre Corréard of the raft of the French Frigate Medusé, I have constructed a number of rafts to explore context, materiality, and symbolism in a liminal space. The potentiality of both is used for revelation and concealment...or concealment through revelation...or the vice versa. This paper reveals the mask of the historical, philosophical and referential tropes to show their relationship to the emotional or poetic.
Subjects/Keywords: Water resources management
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APA (6th Edition):
Manduley, M. (2017). Scene of Shipwreck. (Thesis). University of California – San Diego. Retrieved from http://www.escholarship.org/uc/item/9vh8t0xt
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Manduley, Morgan. “Scene of Shipwreck.” 2017. Thesis, University of California – San Diego. Accessed January 24, 2021.
http://www.escholarship.org/uc/item/9vh8t0xt.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Manduley, Morgan. “Scene of Shipwreck.” 2017. Web. 24 Jan 2021.
Vancouver:
Manduley M. Scene of Shipwreck. [Internet] [Thesis]. University of California – San Diego; 2017. [cited 2021 Jan 24].
Available from: http://www.escholarship.org/uc/item/9vh8t0xt.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Manduley M. Scene of Shipwreck. [Thesis]. University of California – San Diego; 2017. Available from: http://www.escholarship.org/uc/item/9vh8t0xt
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Minnesota
6.
Macdonald, Megan J.
Photochemical and microbial degradation of dissolved
organic matter in the Lake Superior watershed.
Degree: MS, Water resources science, 2012, University of Minnesota
URL: http://purl.umn.edu/131050
► University of Minnesota M.S. thesis. May 2012. Major: Water resources science. Advisor: Dr. Elizabeth C. Minor. 1 computer file (PDF); v, 72 pages.
Photodegradation of…
(more)
▼ University of Minnesota M.S. thesis. May 2012.
Major: Water resources science. Advisor: Dr. Elizabeth C. Minor. 1
computer file (PDF); v, 72 pages.
Photodegradation of dissolved organic matter (DOM)
due to ultraviolet (UV) exposure can have important consequences
for coastal zone productivity. The availability of UV radiation to
aquatic environments has increased due to ozone depletion.
Chromophoric DOM affects the amount of light penetration in a water
column. Ecosystem productivity depends in part on the input of DOM
into a coastal zone. DOM can protect animals, plants, and microbes
from damaging UV light by acting as sunscreen, resulting in
increased ecosystem productivity. Alternatively, DOM can decrease
ecosystem productivity by absorbing light needed for photosynthesis
and forming reaction products that are harmful to coastal zone
biota. Increased urbanization of watersheds and seasonal
differences in weather patterns change the delivery pathways,
reactivity, input, and energy flow of DOM into aquatic systems.
Understanding the input and reactivity of DOM in coastal systems as
a function of land urbanization and season will help determine the
fate of irradiated organic matter and its potential role as a
sunscreen in coastal waters. The consequences of energy flow from
UV radiation to DOM in aquatic systems will provide useful
preliminary data to be used for land-use planning in tributary
regions. This study also provides data useful for predictive models
of the fate of irradiated organic chemicals and the resultant
impact on water quality. In this paper, the study of watershed
urbanization and season on the input and photodegradation of DOM in
coastal waters is discussed based on organic carbon analysis,
UV-Visible spectrophotometry, microbial processing of DOM, and
terrestrial (land-use) analysis.
Advisors/Committee Members: Dr. Elizabeth C. Minor.
Subjects/Keywords: Water resources science
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APA (6th Edition):
Macdonald, M. J. (2012). Photochemical and microbial degradation of dissolved
organic matter in the Lake Superior watershed. (Masters Thesis). University of Minnesota. Retrieved from http://purl.umn.edu/131050
Chicago Manual of Style (16th Edition):
Macdonald, Megan J. “Photochemical and microbial degradation of dissolved
organic matter in the Lake Superior watershed.” 2012. Masters Thesis, University of Minnesota. Accessed January 24, 2021.
http://purl.umn.edu/131050.
MLA Handbook (7th Edition):
Macdonald, Megan J. “Photochemical and microbial degradation of dissolved
organic matter in the Lake Superior watershed.” 2012. Web. 24 Jan 2021.
Vancouver:
Macdonald MJ. Photochemical and microbial degradation of dissolved
organic matter in the Lake Superior watershed. [Internet] [Masters thesis]. University of Minnesota; 2012. [cited 2021 Jan 24].
Available from: http://purl.umn.edu/131050.
Council of Science Editors:
Macdonald MJ. Photochemical and microbial degradation of dissolved
organic matter in the Lake Superior watershed. [Masters Thesis]. University of Minnesota; 2012. Available from: http://purl.umn.edu/131050
University of Minnesota
7.
Oster, Ryan John.
Modeling the corrosive loss of port infrastructure in the
Duluth-Superior Harbor and the North Shore of Lake
Superior.
Degree: MS, Water resources science, 2012, University of Minnesota
URL: http://purl.umn.edu/131055
► University of Minnesota M.S. thesis. May 2012. Major: Water resources science. Advisor: Randall E. Hicks. 1 computer file (PDF); xi, 99 pages, appendix p. 97-99.…
(more)
▼ University of Minnesota M.S. thesis. May 2012.
Major: Water resources science. Advisor: Randall E. Hicks. 1
computer file (PDF); xi, 99 pages, appendix p.
97-99.
Corrosion of steel infrastructure in the
Duluth-Superior Harbor (DSH) is a concern for those who own and
maintain structures that are critical for maritime transportation.
Long-term corrosion rates of steel structures in the DSH were 2 to
4 times faster than is typical for other freshwater habitats,
ranging from 0.06 to 0.14 mm/yr. The highest rates of steel
corrosion were found at moderately to severely corroded sites and
were within the lower range for corrosion of steel in seawater. It
is important to know the potential roles that water quality and
microorganisms play in the corrosion process to better understand
why steel structures in the DSH are corroding faster than expected
and to develop methods to prevent or mitigate this problem.
Dissolved oxygen increased and chloride and sulfate concentrations
decreased in the late 20th century in the DSH after the Western
Lake Superior Sanitary District became operational. In 2010, only
alkalinity, chloride, and conductivity were positively related to
long-term steel corrosion rates in the DSH and interestingly,
dissolved oxygen was inversely related to it. The Larson-Skold
Index, which measures the corrosivity of water towards steel,
decreased or remained constant at three sites between 1972 and
1996. The Larson-Skold Index was usually below the threshold for
concern in 2010-2011, indicating that changes in water chemistry
alone may not be responsible for the severe corrosion of steel in
this harbor. Gallionella, a genus of iron-oxidizing bacteria, was
more abundant within corrosion tubercles on severely corroded steel
structures in the DSH where more than 109 Gallionella 16S rRNA
copies/dry g of tubercle were observed, representing 2% to 34% of
the total prokaryotic cells recovered from these tubercles.
Gallionella bacteria were less abundant (~107 copies/dry g) on
steel structures at sites along the north shore of Lake Superior.
DNA from Gallionella was not detected in the water surrounding
corroding steel structures in the DSH or in harbors on the north
shore of Lake Superior, indicating that these bacteria were
enriched on corroding steel. Sulfate-reducing bacteria (SRB) were
also more abundant within tubercles at severely corroded sites but
at least 2 orders of magnitude less abundant than Gallionella
bacteria, accounting for less than 1% of prokaryotic cells within
these corrosion tubercles. Considered alone, neither the abundance
of Gallionella or SRB was related to long-term steel corrosion
rates in the DSH. A multiple linear regression model was developed
using water quality parameters and bacterial abundances to predict
steel corrosion rates. The model used alkalinity, sulfate
concentration, and log10 transformed SRB abundance to predict the
long-term steel corrosion rate. It overestimated the long-term
corrosion rate of a steel structure in one harbor along the north
shore of Lake Superior and…
Advisors/Committee Members: Randall E. Hicks.
Subjects/Keywords: Water resources science
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Record Details
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APA ·
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MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Oster, R. J. (2012). Modeling the corrosive loss of port infrastructure in the
Duluth-Superior Harbor and the North Shore of Lake
Superior. (Masters Thesis). University of Minnesota. Retrieved from http://purl.umn.edu/131055
Chicago Manual of Style (16th Edition):
Oster, Ryan John. “Modeling the corrosive loss of port infrastructure in the
Duluth-Superior Harbor and the North Shore of Lake
Superior.” 2012. Masters Thesis, University of Minnesota. Accessed January 24, 2021.
http://purl.umn.edu/131055.
MLA Handbook (7th Edition):
Oster, Ryan John. “Modeling the corrosive loss of port infrastructure in the
Duluth-Superior Harbor and the North Shore of Lake
Superior.” 2012. Web. 24 Jan 2021.
Vancouver:
Oster RJ. Modeling the corrosive loss of port infrastructure in the
Duluth-Superior Harbor and the North Shore of Lake
Superior. [Internet] [Masters thesis]. University of Minnesota; 2012. [cited 2021 Jan 24].
Available from: http://purl.umn.edu/131055.
Council of Science Editors:
Oster RJ. Modeling the corrosive loss of port infrastructure in the
Duluth-Superior Harbor and the North Shore of Lake
Superior. [Masters Thesis]. University of Minnesota; 2012. Available from: http://purl.umn.edu/131055
University of Minnesota
8.
Streets, Summer Serena.
Partitioning and bioaccumulation of polychlorinated
biphenyls and polybrominated diphenyl ethers in the microbial food
web of Lake Michigan.
Degree: 2012, University of Minnesota
URL: http://purl.umn.edu/131117
University of Minnesota M.S. thesis. May 2012.
Major:Water Resources science. Advisor:Deborah Swackhamer. 1
computer file (PDF); vii, 61 pages, appendices
A-B.
Abstract summary not available
Subjects/Keywords: Water Resources science
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APA ·
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Streets, S. S. (2012). Partitioning and bioaccumulation of polychlorinated
biphenyls and polybrominated diphenyl ethers in the microbial food
web of Lake Michigan. (Masters Thesis). University of Minnesota. Retrieved from http://purl.umn.edu/131117
Chicago Manual of Style (16th Edition):
Streets, Summer Serena. “Partitioning and bioaccumulation of polychlorinated
biphenyls and polybrominated diphenyl ethers in the microbial food
web of Lake Michigan.” 2012. Masters Thesis, University of Minnesota. Accessed January 24, 2021.
http://purl.umn.edu/131117.
MLA Handbook (7th Edition):
Streets, Summer Serena. “Partitioning and bioaccumulation of polychlorinated
biphenyls and polybrominated diphenyl ethers in the microbial food
web of Lake Michigan.” 2012. Web. 24 Jan 2021.
Vancouver:
Streets SS. Partitioning and bioaccumulation of polychlorinated
biphenyls and polybrominated diphenyl ethers in the microbial food
web of Lake Michigan. [Internet] [Masters thesis]. University of Minnesota; 2012. [cited 2021 Jan 24].
Available from: http://purl.umn.edu/131117.
Council of Science Editors:
Streets SS. Partitioning and bioaccumulation of polychlorinated
biphenyls and polybrominated diphenyl ethers in the microbial food
web of Lake Michigan. [Masters Thesis]. University of Minnesota; 2012. Available from: http://purl.umn.edu/131117
University of Minnesota
9.
Krider, Lori A.
Air - water temperature relationships in the trout
streams of southeastern Minnesota’s carbonate - sandstone
landscape: implications for climate change, brown trout biological
processes, and land management.
Degree: MS, Water resources science, 2012, University of Minnesota
URL: http://purl.umn.edu/132321
► University of Minnesota M.S. thesis. June 2012. Major: Water resources science. Advisor: Joe Magner, Chair. 1 computer file (PDF); vi, 50 pages.
Carbonate - sandstone…
(more)
▼ University of Minnesota M.S. thesis. June 2012.
Major: Water resources science. Advisor: Joe Magner, Chair. 1
computer file (PDF); vi, 50 pages.
Carbonate - sandstone geology in southeastern
Minnesota creates a heterogeneous landscape of springs, seeps, and
sinkholes that supply groundwater into streams. Air temperatures
have been shown to be effective predictors of water temperature in
surface - water dominated streams. However, no published work
investigates the relationship between air and water temperatures in
groundwater - fed streams across watersheds. We used simple linear
regression models to examine air - water temperature relationships
for 40 groundwater - fed streams in Southeastern Minnesota. A 40 -
stream, weekly time scale, composite linear regression model has an
R2 of 0.83, a slope of 0.38, and an intercept of 6.63. Regression
models were also combined by common intercept and slope and split
into winter and non - winter air temperature regimes to allow
approximation of winter water temperature regimes based on non -
winter data. The air - water temperature relationships for
groundwater - fed streams are different in slope and intercept
compared to surface - water dominated streams. The high R2 values
demonstrate that air - water temperature regression models for
groundwater - fed streams may be useful in predicting the thermal
regimes for these systems under future climate scenarios. Climate
change is expected to alter the thermal regime of groundwater - fed
systems but will most strongly affect streams that are more
vulnerable to climate change and will do so at a slower rate than
surface - water dominated systems. A regression model of intercept
vs. slope can be used to identify streams for which water
temperatures are more meteorologically controlled than
hydrologically controlled, and thus more vulnerable to climate
change, with evidence provided by an investigation into the
resulting mean summer water temperature under a moderate climate
change scenario for various types of linear regression models.
Modeling the possible increases in mean summer water temperature
provides insight into the potential effects of climate change on
the amount of suitable brown trout habitat as well as the possible
effects on brown trout biological processes and behavior.
Information on possible future thermal conditions and can be used
to guide restoration versus management strategies to protect the
thermal integrity of trout streams and ensure the persistence of
their stenothermic communities.
Advisors/Committee Members: Joe Magner, Chair.
Subjects/Keywords: Water resources science
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APA (6th Edition):
Krider, L. A. (2012). Air - water temperature relationships in the trout
streams of southeastern Minnesota’s carbonate - sandstone
landscape: implications for climate change, brown trout biological
processes, and land management. (Masters Thesis). University of Minnesota. Retrieved from http://purl.umn.edu/132321
Chicago Manual of Style (16th Edition):
Krider, Lori A. “Air - water temperature relationships in the trout
streams of southeastern Minnesota’s carbonate - sandstone
landscape: implications for climate change, brown trout biological
processes, and land management.” 2012. Masters Thesis, University of Minnesota. Accessed January 24, 2021.
http://purl.umn.edu/132321.
MLA Handbook (7th Edition):
Krider, Lori A. “Air - water temperature relationships in the trout
streams of southeastern Minnesota’s carbonate - sandstone
landscape: implications for climate change, brown trout biological
processes, and land management.” 2012. Web. 24 Jan 2021.
Vancouver:
Krider LA. Air - water temperature relationships in the trout
streams of southeastern Minnesota’s carbonate - sandstone
landscape: implications for climate change, brown trout biological
processes, and land management. [Internet] [Masters thesis]. University of Minnesota; 2012. [cited 2021 Jan 24].
Available from: http://purl.umn.edu/132321.
Council of Science Editors:
Krider LA. Air - water temperature relationships in the trout
streams of southeastern Minnesota’s carbonate - sandstone
landscape: implications for climate change, brown trout biological
processes, and land management. [Masters Thesis]. University of Minnesota; 2012. Available from: http://purl.umn.edu/132321
University of Minnesota
10.
Welsh, Elizabeth J.
A dual dye approach to measuring sunlight in lotic
systems.
Degree: MS, Water Resources Science, 2012, University of Minnesota
URL: http://purl.umn.edu/140171
► University of Minnesota M.S. thesis. August 2012. Major: Water Resources Science. Advisor: Dr. Elizabeth C. Minor. 1 computer file (PDF); v, 38 pages, appendix p.…
(more)
▼ University of Minnesota M.S. thesis. August 2012.
Major: Water Resources Science. Advisor: Dr. Elizabeth C. Minor. 1
computer file (PDF); v, 38 pages, appendix p.
37-38.
Light is an energy source that affects the
metabolism of an aquatic system by providing energy for
photosynthesis, the thermal structure by the transfer of light to
heat energy, and the chemical make-up by providing energy for both
indirect and direct photochemical reactions. This thesis considers
the use of two dyes (rhodamine WT and fluorescein) as a way to
measure the amount of light affecting lotic systems. These dyes are
common tracers usually used in aquatic systems to measure water
flow and mixing. Rhodamine WT exhibits photo-stability; while
fluorescein exhibits photo-lability. Combining these two could
potentially provide a Lagrangian measure of sunlight exposure in a
lotic system; a previously unattainable view of the light field in
such systems. In this thesis, several lab experiments were
performed to test the effects of temperature and pH on the
fluorescence of the dyes and to test the effects of pH and
wavelength of light on the photoresponse of the dyes upon
irradiation. A correction factor for temperature was found in lab
experiments that matched previously published results. When pH
remained within the normal range of North Shore streams
(6.99-7.54), rhodamine WT exhibited photo-stability while
fluorescein exhibited photo-lability; however, changes in response
were seen as a function of pH and there are indications that
rhodamine WT may be photo-labile at high pH. Irradiation of the
dyes showed that wavelengths at and/or above 420 nm degrade the
fluorescein. The dual-dye approach was tested in Amity Creek, a
designated trout stream located on the north shore of Lake
Superior. During deployment along a given reach, the dyes showed
robust applicability on base flow, high irradiance days but no
appreciable photoresponse on high flow days. During base flow
deployments, the fluorescein to rhodamine WT ratio decreased
linearly over time (with an R2 ranging from 0.971-0.998). Overall,
in-stream Lagrangian deployments showed similar degradation rates
to those seen in batch samples of stream water placed on the stream
bed in a fixed position in sunlight for the same period of time.
This concurs with visual observations that there is no significant
canopy cover down this stream reach. Although the dual-dye
methodology was successful in acting as an in situ light monitor
and is applicable to streams if temperature is recorded and pH is
within a certain operating range, more work needs to be done to
demonstrate if the use of fluorescein and rhodamine WT is a
practical alternative to current methods of light
measurement.
Advisors/Committee Members: Dr. Elizabeth C. Minor.
Subjects/Keywords: Water Resources Science
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APA (6th Edition):
Welsh, E. J. (2012). A dual dye approach to measuring sunlight in lotic
systems. (Masters Thesis). University of Minnesota. Retrieved from http://purl.umn.edu/140171
Chicago Manual of Style (16th Edition):
Welsh, Elizabeth J. “A dual dye approach to measuring sunlight in lotic
systems.” 2012. Masters Thesis, University of Minnesota. Accessed January 24, 2021.
http://purl.umn.edu/140171.
MLA Handbook (7th Edition):
Welsh, Elizabeth J. “A dual dye approach to measuring sunlight in lotic
systems.” 2012. Web. 24 Jan 2021.
Vancouver:
Welsh EJ. A dual dye approach to measuring sunlight in lotic
systems. [Internet] [Masters thesis]. University of Minnesota; 2012. [cited 2021 Jan 24].
Available from: http://purl.umn.edu/140171.
Council of Science Editors:
Welsh EJ. A dual dye approach to measuring sunlight in lotic
systems. [Masters Thesis]. University of Minnesota; 2012. Available from: http://purl.umn.edu/140171
University of Minnesota
11.
Welch, Jacqueline B.
Comparison of the structure and composition of
bacterioplankton communities in the ballast water of commercial
ships and the Duluth-Superior Harbor.
Degree: 2012, University of Minnesota
URL: http://purl.umn.edu/140887
► University of Minnesota M.S. thesis. August 2012. Major: Water Resources science. Advisor:n Randall E. Hicks. 1 computer file (PDF); x, 149 pages, appendix p. 138-149.…
(more)
▼ University of Minnesota M.S. thesis. August 2012.
Major: Water Resources science. Advisor:n Randall E. Hicks. 1
computer file (PDF); x, 149 pages, appendix p.
138-149.
Ship ballast water is a potential vector for the
introduction and spread of aquatic nonindigenous species (NIS).
Although most studies focus on invasive plants and animals, there
is an increased interest in the potential for invasive microbes.
The Duluth- Superior Harbor (DSH), located in a freshwater estuary
at the confluence of Lake Superior and the St. Louis River,
receives more ballast water discharge than any other Great Lakes
port yet little is known about the bacterioplankton communities in
the harbor or the ballast water released into the harbor. The two
most important factors affecting the successful establishment of an
aquatic NIS through ballast water discharge are propagule pressure,
and the abiotic and biotic characteristics of the new environment.
Water was collected at six sites in Lake Superior, the
Duluth-Superior Harbor, and the lower St. Louis River to
characterize bacterioplankton communities. Other water samples were
collected from the ballast tanks of ten commercial ships visiting
the Duluth-Superior Harbor and the Western Lake Superior Sanitary
District (WLSSD) because these sources may influence the genetic
structure and composition of natural bacterioplankton communities
in the harbor. Three distinct bacterioplankton communities
representative of Lake Superior, the Duluth-Superior Harbor, and
the St. Louis River habitats were detected in water samples
collected on one day in early September 2009 (ANOSIM, p < 0.05)
using a DNA fingerprint analysis (T-RFLP). These results were
consistent with findings of other investigations that found
distinct bacterioplankton communities in estuarine mixing zones.
Water temperature, dissolved organic carbon (DOC), ammonium (NH4
+), and nitrate (NO3 −) were more highly correlated with
differences in the genetic structure of bacterioplankton
communities along a transect from the river through the harbor than
other environmental variables. DNA fingerprint analyses also
indicated that bacterioplankton communities discharged into the DSH
with ballast water and treated wastewater effluent were different
from bacterioplankton communities found within the harbor. The most
common bacterial phyla found in freshwater habitats (i.e.,
Alphaproteobacteria, Betaproteobacteria, Actinobacteria,
Bacteroidetes) were also seen in 16S rRNA gene clone libraries of
freshwater ballast and the Duluth-Superior Harbor. The genetic
structure and species composition of the seawater ballast
bacterioplankton community from an ocean-going ship was
fundamentally different than the bacterioplankton communities in
freshwater ballast, and was uncharacteristically dominated by
bacteria from the Epsilonproteobacteria. Interestingly, three
environmental DNA sequences from the seawater ballast of this ship
were similar to Tennacibaculum soleae, a marine fish pathogen
(phylum Bacteroidetes, Class Flavobacteria). DNA from this…
Subjects/Keywords: Water Resources science
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APA ·
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CSE |
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Manager
APA (6th Edition):
Welch, J. B. (2012). Comparison of the structure and composition of
bacterioplankton communities in the ballast water of commercial
ships and the Duluth-Superior Harbor. (Masters Thesis). University of Minnesota. Retrieved from http://purl.umn.edu/140887
Chicago Manual of Style (16th Edition):
Welch, Jacqueline B. “Comparison of the structure and composition of
bacterioplankton communities in the ballast water of commercial
ships and the Duluth-Superior Harbor.” 2012. Masters Thesis, University of Minnesota. Accessed January 24, 2021.
http://purl.umn.edu/140887.
MLA Handbook (7th Edition):
Welch, Jacqueline B. “Comparison of the structure and composition of
bacterioplankton communities in the ballast water of commercial
ships and the Duluth-Superior Harbor.” 2012. Web. 24 Jan 2021.
Vancouver:
Welch JB. Comparison of the structure and composition of
bacterioplankton communities in the ballast water of commercial
ships and the Duluth-Superior Harbor. [Internet] [Masters thesis]. University of Minnesota; 2012. [cited 2021 Jan 24].
Available from: http://purl.umn.edu/140887.
Council of Science Editors:
Welch JB. Comparison of the structure and composition of
bacterioplankton communities in the ballast water of commercial
ships and the Duluth-Superior Harbor. [Masters Thesis]. University of Minnesota; 2012. Available from: http://purl.umn.edu/140887
University of Minnesota
12.
Erickson, Jeremy Michael.
Stream Metabolism Along an Urban to Rural Gradient in
Lake Superior Tributary Streams.
Degree: MS, Water Resources Science, 2011, University of Minnesota
URL: http://purl.umn.edu/104193
► University of Minnesota Master of Science thesis. January 2011. Major: Water Resources Science. Advisor: Lucinda B. Johnson. 1 computer file (PDF); vi, 51 pages.
The…
(more)
▼ University of Minnesota Master of Science thesis.
January 2011. Major: Water Resources Science. Advisor: Lucinda B.
Johnson. 1 computer file (PDF); vi, 51 pages.
The North Shore streams of Lake Superior are known
for their clear cool waters that flow through expanses of
undeveloped land. However, many North Shore watersheds are
experiencing rapid urbanization, resulting in increased impervious
surface cover (ISC). Previous research on the impact of ecological
disturbances on stream health have seldom focused on ecosystem
processes such as stream metabolism. This study assesses the effect
of increasing urbanization on whole stream community respiration
(CR) and gross primary production (GPP) rates during summer and
autumn base flow periods for nine low productivity, heterotrophic
streams spanning a watershed ISC gradient. Land cover was measured
as a percentage of the whole watershed and by distance-weighting to
evaluate the possible influence of spatial position of land cover
on stream function. Stream metabolism rates were determined using
high frequency diel dissolved oxygen changes at a single station
coupled with propane evasion to estimate stream reaeration rates.
GPP estimates ranged from 0.02 to 2.02 g O2 m-2d-1 and CR from 0.17
to 6.09 g O2 m-2d-1. During summer base flows there were strong
correlations between urban development measures and both stream
metabolism and nutrients. However, the associations between land
use and stream metabolism were not observed during the autumn base
flow period. Our data suggest the variability in stream flow and
leaf off along with stream temperature changes appear to be the
dominant factors influencing the relationship between land use and
stream metabolism in these Lake Superior tributary streams.
Distance-weighting did not improve the predictive power on stream
metabolism and water chemistry variables.
Advisors/Committee Members: Lucinda B. Johnson.
Subjects/Keywords: Water Resources Science
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CSE |
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Manager
APA (6th Edition):
Erickson, J. M. (2011). Stream Metabolism Along an Urban to Rural Gradient in
Lake Superior Tributary Streams. (Masters Thesis). University of Minnesota. Retrieved from http://purl.umn.edu/104193
Chicago Manual of Style (16th Edition):
Erickson, Jeremy Michael. “Stream Metabolism Along an Urban to Rural Gradient in
Lake Superior Tributary Streams.” 2011. Masters Thesis, University of Minnesota. Accessed January 24, 2021.
http://purl.umn.edu/104193.
MLA Handbook (7th Edition):
Erickson, Jeremy Michael. “Stream Metabolism Along an Urban to Rural Gradient in
Lake Superior Tributary Streams.” 2011. Web. 24 Jan 2021.
Vancouver:
Erickson JM. Stream Metabolism Along an Urban to Rural Gradient in
Lake Superior Tributary Streams. [Internet] [Masters thesis]. University of Minnesota; 2011. [cited 2021 Jan 24].
Available from: http://purl.umn.edu/104193.
Council of Science Editors:
Erickson JM. Stream Metabolism Along an Urban to Rural Gradient in
Lake Superior Tributary Streams. [Masters Thesis]. University of Minnesota; 2011. Available from: http://purl.umn.edu/104193
University of Minnesota
13.
Wein, Sarah Nicole Panzer.
Targeting Audiences for Improved Lawn Management: Can
Grouping Households Assist with Nonpoint Water Pollution
Reduction.
Degree: MS, Water Resources Science, 2011, University of Minnesota
URL: http://purl.umn.edu/104297
► University of Minnesota Master of Science thesis. January 2011. Major: Water Resources Science. Advisor: Kristen Nelson. 1 computer file (PDF); vi, 35 pages.
In urban…
(more)
▼ University of Minnesota Master of Science thesis.
January 2011. Major: Water Resources Science. Advisor: Kristen
Nelson. 1 computer file (PDF); vi, 35 pages.
In urban ecosystems, households are important
decision-making units that are resource consumers and contributors
to urban water pollution. At the landscape level, individual
household choices regarding lawn management vary greatly,
contributing to the detriment or protection of water resources. To
better target household behavior change, we need to understand the
social influences that determine how and why households manage
their lawns differently, and what characteristics of the household
could be driving these differences. We suggest that a better
understanding of households could inform targeted policies and
programs for effective change strategies. By spatially examining
income, house age and proximity to a lake, we analyzed whether
household groupings reflect households that think and act in
similar ways with respect to lawn management. We obtained data for
this research through a 2008 mail survey completed by the Twin
Cities Household Ecosystem Project in Ramsey and Anoka Counties,
Minnesota. Responses to questions pertaining to fertilization, leaf
and lawn clipping management, vegetation choice, and lawn
management attitudes were analyzed. When households were grouped
spatially across the landscape with respect to proximity to a lake,
few significant differences were found between household groups
within 200 meters vs. farther than 200 meters. While income did
influence particular lawn management attitudes and behaviors, it
did not group spatially at a county scale, or at the finer scale of
Saint Paul, the major city in our study area. House age showed
significant relationships with almost every attitude and behavior
examined, and was the only factor to demonstrate important spatial
grouping. The correlation of house age with lawn
attitudes/behaviors, however, is partially an artifact of housing
density and number of trees on a household’s property. This study
demonstrates that it may be possible to target households based on
particular factors in order to tailor educational programming and
policy to influence lawn management behavior, reduce pollutants
leaving household lawns, and therefore improve water
quality.
Advisors/Committee Members: Kristen Nelson.
Subjects/Keywords: Water Resources Science
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APA ·
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Manager
APA (6th Edition):
Wein, S. N. P. (2011). Targeting Audiences for Improved Lawn Management: Can
Grouping Households Assist with Nonpoint Water Pollution
Reduction. (Masters Thesis). University of Minnesota. Retrieved from http://purl.umn.edu/104297
Chicago Manual of Style (16th Edition):
Wein, Sarah Nicole Panzer. “Targeting Audiences for Improved Lawn Management: Can
Grouping Households Assist with Nonpoint Water Pollution
Reduction.” 2011. Masters Thesis, University of Minnesota. Accessed January 24, 2021.
http://purl.umn.edu/104297.
MLA Handbook (7th Edition):
Wein, Sarah Nicole Panzer. “Targeting Audiences for Improved Lawn Management: Can
Grouping Households Assist with Nonpoint Water Pollution
Reduction.” 2011. Web. 24 Jan 2021.
Vancouver:
Wein SNP. Targeting Audiences for Improved Lawn Management: Can
Grouping Households Assist with Nonpoint Water Pollution
Reduction. [Internet] [Masters thesis]. University of Minnesota; 2011. [cited 2021 Jan 24].
Available from: http://purl.umn.edu/104297.
Council of Science Editors:
Wein SNP. Targeting Audiences for Improved Lawn Management: Can
Grouping Households Assist with Nonpoint Water Pollution
Reduction. [Masters Thesis]. University of Minnesota; 2011. Available from: http://purl.umn.edu/104297
University of Minnesota
14.
Li, Jiying.
Diagenesis and sediment-water exchanges in organic-poor
sediments of Lake Superior.
Degree: MS, Water resources science, 2011, University of Minnesota
URL: http://purl.umn.edu/114087
► University of Minnesota M.S. thesis. June 2011. Major: Water resources science. Advisor: Sergei Katsev. 1 computer file (PDF); vi, 117 pages.
To investigate early diagenetic…
(more)
▼ University of Minnesota M.S. thesis. June 2011.
Major: Water resources science. Advisor: Sergei Katsev. 1 computer
file (PDF); vi, 117 pages.
To investigate early diagenetic processes and the
spatial and temporal variability in organic-poor sediments of Lake
Superior, we have repeatedly sampled sediments at 8 locations
across the lake. Sediment geochemistry was characterized by the
penetration depths and uptake rates of oxygen, and the
distributions of organic carbon, dissolved Fe(II), nitrate,
ammonium, soluble reactive phosphate (SRP), and solid phase
Fe(III)/Fe(II) and phosphorus. Oxygen penetrated deeply into the
sediments at all locations: from ~3.5 cm at near-shore stations to
>12 cm in the deep basins. The total oxygen uptake ranged from
4.44 mmol m-2 d-1 to 7.68 mmol m-2 d-1, averaging 6.10 mmol m-2
d-1. Diffusive oxygen flux averaged 2.92 ± 0.75 mmol m-2 d-1.
Aerobic respiration accounted for >90-95% of the total carbon
degradation, with denitrification and iron reduction contributing
<5% of the total carbon degradation. Reactivity of the organic
carbon in the upper 1 cm of sediment was calculated to be ~ 1.2
yr-1, which is typical for organic material less than a year old.
Sediment carbon degradation rate of 5.29± 1.20 mmol m-2 d-1
corresponds to ~ 19% of the recently estimated primary production.
More than ~ 90% of carbon reaching the lake floor is mineralized,
with a sediment carbon burial flux of 0.49 mmol m-2 d-1. Diffusive
fluxes of nitrate from sediment into the overlying water averaged
0.17± 0.07 mmol m-2 d-1, recycling ~ 40% of nitrogen sedimentation
flux. Phosphorus cycling was strongly associated with the
diagenetic cycling of iron. Sediment diffusive effluxes of SRP were
small (< ~ 1.5 x 10-3 mmol m-2 d-1) and similar among stations.
The efficient trapping of phosphorus in the sediment is interpreted
as a result of strong adsorption of phosphorus by iron
(hydro)oxides. Sediments in Lake Superior exhibit strong spatial
heterogeneity on spatial scales down to hundreds of meters. The
presence of multiple Fe- and Mn-rich layers, forming dense crusts
and often visible to the naked eye, suggests decadal or longer
variations in the sediment’s physical or redox environment. Oxygen
diffusive fluxes and carbon degradation rates exhibited strong
seasonality, with higher oxygen fluxes and carbon degradation rates
in July, and the depth of oxygen penetration varied by several mm
to cm.
Advisors/Committee Members: Sergei Katsev.
Subjects/Keywords: Water resources science
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APA ·
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MLA ·
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CSE |
Export
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Manager
APA (6th Edition):
Li, J. (2011). Diagenesis and sediment-water exchanges in organic-poor
sediments of Lake Superior. (Masters Thesis). University of Minnesota. Retrieved from http://purl.umn.edu/114087
Chicago Manual of Style (16th Edition):
Li, Jiying. “Diagenesis and sediment-water exchanges in organic-poor
sediments of Lake Superior.” 2011. Masters Thesis, University of Minnesota. Accessed January 24, 2021.
http://purl.umn.edu/114087.
MLA Handbook (7th Edition):
Li, Jiying. “Diagenesis and sediment-water exchanges in organic-poor
sediments of Lake Superior.” 2011. Web. 24 Jan 2021.
Vancouver:
Li J. Diagenesis and sediment-water exchanges in organic-poor
sediments of Lake Superior. [Internet] [Masters thesis]. University of Minnesota; 2011. [cited 2021 Jan 24].
Available from: http://purl.umn.edu/114087.
Council of Science Editors:
Li J. Diagenesis and sediment-water exchanges in organic-poor
sediments of Lake Superior. [Masters Thesis]. University of Minnesota; 2011. Available from: http://purl.umn.edu/114087
University of Minnesota
15.
Newman, Brian J.
Biofilm ecoenzymatic activity, organic carbon and
nitrogen in Lake Superior tributary streams.
Degree: 2011, University of Minnesota
URL: http://purl.umn.edu/117076
► University of Minnesota M.S. thesis. August 2011. Major:Water resources science. Advisors: Advisors: Dr. Brian H. Hill and Dr. Elizabeth Minor. 1 computer file (PDF); vi,…
(more)
▼ University of Minnesota M.S. thesis. August 2011.
Major:Water resources science. Advisors: Advisors: Dr. Brian H.
Hill and Dr. Elizabeth Minor. 1 computer file (PDF); vi, 45
pages.
I compared the ecoenzymatic activity of naturally
occurring epilithic biofilm to stream water carbon and nitrogen
concentrations in Lake Superior tributary streams along the south
and north shores of the western end of Lake Superior. My goal was
to determine if the ecoenzymatic activity of biofilm would reflect
water chemistry. The streams drain catchments ranging in size from
14-172 km2 of primarily deciduous forest, coniferous forest and
woody wetlands. Measurements and samples were collected during base
stream flows (June-September). The streams represented a broad
range of organic carbon, nitrogen and phosphorous concentrations,
which correlated to physical habitat parameters and land usage. I
used light absorbance in the ultraviolet and visible light (UV-VIS)
spectrum to show differences in dissolved organic matter (DOM)
between sites on the north and south shore. The UV-VIS proxies of
E2:E3 and SUVA254, which indicate molecular size and degree of
aromaticity, were correlated with the percentage of wetlands in the
catchment, as well as the specific conductance, pH and the C, N and
P concentrations in the water. Eleven different ecoenzymes involved
in the breakdown of organic matter were measured. The activities of
these enzymes were often positively correlated to each other and
correlated to the measured water chemistry. The slopes from Type II
linear regression of β-N-acetylglucosaminidase to phosphatase
(0.77), β-d-glucosidase to phosphatase (0.68), and -d-glucosidase
to β-N-acetylglucosaminidase (0.88) are presented here as metabolic
stoichiometric ratios. The molar C:N ratio in epilithic biofilm
(11:1) was positively correlated to the ratio of dissolved organic
carbon to total dissolved nitrogen (DOC:TDN) in filtered (<0.45
μm) stream water and negatively correlated with biofilm peptidase
activity. The expression of the peptidase activity by both
L-alanine aminopeptidase and L-leucine aminopeptidase increased in
response to dissolved organic nitrogen (DON). Increasing
stream-water inorganic nitrogen (DIN) concentrations reduced or
inhibited L-alanine aminopeptidase expression and had no apparent
influence on L-leucine aminopeptidase. These results along with
other studies of biofilm show that the ecoenzymatic activity of
biofilm and the C:N ratio in biofilm reflects water chemistry,
providing further evidence linking the stoichiometric theory of
ecology to metabolic theories of ecology. The ecoenzymatic activity
is a measurement of metabolic requirements mediating the
stoichiometry of incorporation of nutrients by the biofilm. This
study was the first to compare natural epilithic biofilm ecoenzyme
activity in the Lake Superior region to water chemistry, land use
and habitat characteristics.
Subjects/Keywords: Water resources science
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APA (6th Edition):
Newman, B. J. (2011). Biofilm ecoenzymatic activity, organic carbon and
nitrogen in Lake Superior tributary streams. (Masters Thesis). University of Minnesota. Retrieved from http://purl.umn.edu/117076
Chicago Manual of Style (16th Edition):
Newman, Brian J. “Biofilm ecoenzymatic activity, organic carbon and
nitrogen in Lake Superior tributary streams.” 2011. Masters Thesis, University of Minnesota. Accessed January 24, 2021.
http://purl.umn.edu/117076.
MLA Handbook (7th Edition):
Newman, Brian J. “Biofilm ecoenzymatic activity, organic carbon and
nitrogen in Lake Superior tributary streams.” 2011. Web. 24 Jan 2021.
Vancouver:
Newman BJ. Biofilm ecoenzymatic activity, organic carbon and
nitrogen in Lake Superior tributary streams. [Internet] [Masters thesis]. University of Minnesota; 2011. [cited 2021 Jan 24].
Available from: http://purl.umn.edu/117076.
Council of Science Editors:
Newman BJ. Biofilm ecoenzymatic activity, organic carbon and
nitrogen in Lake Superior tributary streams. [Masters Thesis]. University of Minnesota; 2011. Available from: http://purl.umn.edu/117076
University of Minnesota
16.
Hartzheim, Paul Matthew.
Application of household flux calculator in determining
variability in annual carbon, nitrogen, and phosphorus flux through
Falcon Heights, Minnesota households.
Degree: MS, Water resources science, 2011, University of Minnesota
URL: http://purl.umn.edu/120087
► University of Minnesota M.S. thesis. December 2011. Major: Water resources science. Advisor: Dr. Lawrence A. Baker. 1 computer file (PDF); xi, 127 pages, appendix p.…
(more)
▼ University of Minnesota M.S. thesis. December 2011.
Major: Water resources science. Advisor: Dr. Lawrence A. Baker. 1
computer file (PDF); xi, 127 pages, appendix p.
99-127.
As human population has continued to grow and
become increasingly more metropolitan, urban ecosystems have become
an increasingly important contributor to air and water pollution on
a local, regional, and global scale. As such, households provide a
useful unit of study, and quantifying environmental impacts from
individual households helps provide a clearer picture of what
individual household decisions have the largest impact to air and
water quality. In this study, a group of University of Minnesota
research fellows conducted a series of interviews and field surveys
of single-family homeowners in the city of Falcon Heights,
Minnesota. The surveys were constructed by a team of faculty
members and research associates, for the purpose of collecting
detailed information on household consumption, behaviors, and
attitudes. The survey was developed to obtain information that
could be translated into quantitative data to determine overall
flux of carbon (C), nitrogen (N) and phosphorus (P) as they relate
to household activities and personal choices. For purposes of this
thesis, we define “flux” as the quantitative measurement of inputs
and outputs through the household unit, including any portions that
are sequestered within or exported from the household. Surveys were
conducted with 34 households; 6 or which were eliminated from this
analysis due to incomplete data. Approximately 40 variables
gathered from the surveys were quantified and directly inputted
into the Household Flux Calculator (HFC), a spreadsheet accounting
model which was developed as part of this study to estimate the
overall fluxes of C, N, and P for each household. This thesis
analyzes the variability of C, N, and P flux among the households
surveyed, and highlights household activities that have the
greatest influence on the inputs and outputs of household C, N, and
P, with the goal of developing a better understanding of how
decisions and choices made on a household level impact local,
regional, and global environments.
Advisors/Committee Members: Dr. Lawrence A. Baker.
Subjects/Keywords: Water resources science
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APA (6th Edition):
Hartzheim, P. M. (2011). Application of household flux calculator in determining
variability in annual carbon, nitrogen, and phosphorus flux through
Falcon Heights, Minnesota households. (Masters Thesis). University of Minnesota. Retrieved from http://purl.umn.edu/120087
Chicago Manual of Style (16th Edition):
Hartzheim, Paul Matthew. “Application of household flux calculator in determining
variability in annual carbon, nitrogen, and phosphorus flux through
Falcon Heights, Minnesota households.” 2011. Masters Thesis, University of Minnesota. Accessed January 24, 2021.
http://purl.umn.edu/120087.
MLA Handbook (7th Edition):
Hartzheim, Paul Matthew. “Application of household flux calculator in determining
variability in annual carbon, nitrogen, and phosphorus flux through
Falcon Heights, Minnesota households.” 2011. Web. 24 Jan 2021.
Vancouver:
Hartzheim PM. Application of household flux calculator in determining
variability in annual carbon, nitrogen, and phosphorus flux through
Falcon Heights, Minnesota households. [Internet] [Masters thesis]. University of Minnesota; 2011. [cited 2021 Jan 24].
Available from: http://purl.umn.edu/120087.
Council of Science Editors:
Hartzheim PM. Application of household flux calculator in determining
variability in annual carbon, nitrogen, and phosphorus flux through
Falcon Heights, Minnesota households. [Masters Thesis]. University of Minnesota; 2011. Available from: http://purl.umn.edu/120087
University of Minnesota
17.
Van Der Werff, Jessica.
Spatial and temporal dynamics of phytoplankton nutrient
status in the deep chlorophyll layer (DCL) of Lake
Superior.
Degree: 2011, University of Minnesota
URL: http://purl.umn.edu/120529
► University of Minnesota M.S. thesis. December 2011. Major:Water Resources science. Advisors: Stephanie J. Guildford, Robert E. Hecky. 1 computer file (PDF); vii, 134 pages, appendix…
(more)
▼ University of Minnesota M.S. thesis. December 2011.
Major:Water Resources science. Advisors: Stephanie J. Guildford,
Robert E. Hecky. 1 computer file (PDF); vii, 134 pages, appendix p.
94-134.
Total phosphorus and chlorophyll have been
declining over the last few decades in the ultra-oligotrophic Lake
Superior. A region in the water column where chlorophyll exceeds
that of the mixed layer during the stratified period, referred to
in this study as the deep chlorophyll layer (DCL), is presumably
ideal in terms of nutrients and light for primary producers.
Investigating the nutrient status of these primary producers could
aid in understanding the nutrient dynamics in this large, low
nutrient lake. Lake nutrient concentration and phytoplankton
nutrient status measurements were determined to evaluate seasonal,
temporal, and spatial patterns both across the lake and with depth.
Additionally, active fluorometry was measured in order to compare
its efficacy as a nutrient status indicator with more traditional
methods. Water samples were collected above, within, and below the
DCL across the lake during the summer of 2010. Chemical analyses
including chlorophyll a, particulate nutrients (carbon, nitrogen,
and phosphorus), soluble reactive phosphorus, total and total
dissolved phosphorus, total and total dissolved nitrogen, ammonium,
nitrate, and soluble reactive silica were performed in conjunction
with bioassays (N and P debt, alkaline phosphatase activity) and
active fluorometry (PhytoPAM) to fully assess phytoplankton
nutrient status. Results indicated extreme P deficiency across the
lake in the epilimnion and metalimnion with the most extreme
deficiency seeming to occur in the epilimnion and occasional
deficiency in the hypolimnion. Also, a P deficiency indicator
exhibited a diurnal pattern with higher deficiency during the
daytime. Deficiency also appeared to be highest in the spring and
decline over the course of the summer; however, even in September,
samples still indicated extreme deficiency. Additionally, N debt
data suggests N deficiency in spring which had disappeared by
August. Active fluorometry was consistent with nutrient bioassays
in suggesting that the epilimnion was more stressed than the
metalimnion or hypolimnion. Strong nutrient concentration gradients
across the lake and with depth as well as with time were absent,
although there appears to be a seasonal decrease in SRP, nitrate,
and silica and an increase in TN and TDN from June to September.
Nutrient concentration and phytoplankton nutrient status could have
been influenced by many factors in Lake Superior including a
seasonal shift in algal species composition, zooplankton nutrient
translocation, contribution to deficiency by picobacterioplankton,
borderline iron (Fe) limitation, and reallocation of nutrients for
purposes other than photochemistry.
Subjects/Keywords: Water Resources science
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APA ·
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CSE |
Export
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Manager
APA (6th Edition):
Van Der Werff, J. (2011). Spatial and temporal dynamics of phytoplankton nutrient
status in the deep chlorophyll layer (DCL) of Lake
Superior. (Masters Thesis). University of Minnesota. Retrieved from http://purl.umn.edu/120529
Chicago Manual of Style (16th Edition):
Van Der Werff, Jessica. “Spatial and temporal dynamics of phytoplankton nutrient
status in the deep chlorophyll layer (DCL) of Lake
Superior.” 2011. Masters Thesis, University of Minnesota. Accessed January 24, 2021.
http://purl.umn.edu/120529.
MLA Handbook (7th Edition):
Van Der Werff, Jessica. “Spatial and temporal dynamics of phytoplankton nutrient
status in the deep chlorophyll layer (DCL) of Lake
Superior.” 2011. Web. 24 Jan 2021.
Vancouver:
Van Der Werff J. Spatial and temporal dynamics of phytoplankton nutrient
status in the deep chlorophyll layer (DCL) of Lake
Superior. [Internet] [Masters thesis]. University of Minnesota; 2011. [cited 2021 Jan 24].
Available from: http://purl.umn.edu/120529.
Council of Science Editors:
Van Der Werff J. Spatial and temporal dynamics of phytoplankton nutrient
status in the deep chlorophyll layer (DCL) of Lake
Superior. [Masters Thesis]. University of Minnesota; 2011. Available from: http://purl.umn.edu/120529
University of Minnesota
18.
Blick, Bethany Lynn.
Knife River stressor identification, Kanabec County,
Minnesota.
Degree: MS, Water resources science, 2012, University of Minnesota
URL: http://purl.umn.edu/122091
► University of Minnesota M.S. thesis. February 2012. Major: Water resources science. Advisor: Bruce Vondracek. 1 computer file (PDF); viii, 97 pages.
The Environmental Protection Agency…
(more)
▼ University of Minnesota M.S. thesis. February 2012.
Major: Water resources science. Advisor: Bruce Vondracek. 1
computer file (PDF); viii, 97 pages.
The Environmental Protection Agency (EPA) developed
the Stressor Identification (SI) process to identify stressors
causing biological impairment. The SI process precedes a TMDL
(Total Maximum Daily Load) and offers a means by which developers
of a TMDL can more confidently identify stressor(s) causing
impairment. The EPA’s Causal Analysis/Diagnosis Decision
Information System (CADDIS) framework was utilized to develop a SI
for the Knife River Basin, Kanabec County, Minnesota. Data
collected by the Minnesota Pollution Control Agency (PCA) during
biomonitoring and the EPA’s STORET database were analyzed using
nonmetric multidimentional scaling (NMDS) ordination to evaluate
the relationships between fish species and abundance, and
environmental and chemical stressors. A least-squared regression
between fish index of biotic integrity (IBI) scores and
environmental variables was also calculated. The NMDS analysis
suggests there is similarity between the two headwater sites, which
are correlated with low gradient and a high percent fines,
agriculture, urban, and rangeland. High gradient, percent forest
and percent riffles were correlated with the mid-stream reaches of
the Knife River. Only pH was significantly correlated with fish IBI
scores (p=0.034). The Knife River SI identified three potential
stressors; low dissolved oxygen (DO), high pH, and excess bedded
sediment.
Advisors/Committee Members: Bruce Vondracek.
Subjects/Keywords: Water resources science
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APA (6th Edition):
Blick, B. L. (2012). Knife River stressor identification, Kanabec County,
Minnesota. (Masters Thesis). University of Minnesota. Retrieved from http://purl.umn.edu/122091
Chicago Manual of Style (16th Edition):
Blick, Bethany Lynn. “Knife River stressor identification, Kanabec County,
Minnesota.” 2012. Masters Thesis, University of Minnesota. Accessed January 24, 2021.
http://purl.umn.edu/122091.
MLA Handbook (7th Edition):
Blick, Bethany Lynn. “Knife River stressor identification, Kanabec County,
Minnesota.” 2012. Web. 24 Jan 2021.
Vancouver:
Blick BL. Knife River stressor identification, Kanabec County,
Minnesota. [Internet] [Masters thesis]. University of Minnesota; 2012. [cited 2021 Jan 24].
Available from: http://purl.umn.edu/122091.
Council of Science Editors:
Blick BL. Knife River stressor identification, Kanabec County,
Minnesota. [Masters Thesis]. University of Minnesota; 2012. Available from: http://purl.umn.edu/122091
Cornell University
19.
Choi, Kwang-Bae.
STOCHASTIC DYNAMIC PROGRAMMING (SDP) AND SAMPLE STOCHASTIC DYNAMIC PROGRAMMING (SSDP) FOR OPTIMIZATION OF KOREAN HYDROPOWER PLANT.
Degree: M.S., Civil and Environmental Engineering, Civil and Environmental Engineering, 2017, Cornell University
URL: http://hdl.handle.net/1813/59071
► As society is increasingly aware of the ecological value of water. As a result, sustainable eco-friendly hydropower reservoir operation is a priority to preserve downstream…
(more)
▼ As society is increasingly aware of the ecological value of
water. As a result, sustainable eco-friendly hydropower reservoir operation is a priority to preserve downstream biodiversity while minimizing the impact on energy production levels. This study develops Stochastic Dynamic Programming (SDP) and Sample Stochastic Dynamic Programming (SSDP) optimization models to address minimum environmental flow constraints on hydropower operations levels and storage targets while reflecting the uncertainty in future inflow forecasts. A case study of the Bosunggang Hydropower system in Korea compares the performance of historical operations with decisions generated by SDP and SSDP models with different hydrologic state variables, state variable discretization, and system turbine capacities. A watershed model, SSARR, was successfully employed to obtain a daily soil moisture series representing the watershed’s wetness. Importantly, simply adopting sophisticated optimization models without careful consideration of system characteristics such as basin hydrology and system objective does not guarantee better optimized system performance.
Advisors/Committee Members: Stedinger, Jery Russell (chair), Schneider, Rebecca L. (committee member).
Subjects/Keywords: Water resources management
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CSE |
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Manager
APA (6th Edition):
Choi, K. (2017). STOCHASTIC DYNAMIC PROGRAMMING (SDP) AND SAMPLE STOCHASTIC DYNAMIC PROGRAMMING (SSDP) FOR OPTIMIZATION OF KOREAN HYDROPOWER PLANT. (Masters Thesis). Cornell University. Retrieved from http://hdl.handle.net/1813/59071
Chicago Manual of Style (16th Edition):
Choi, Kwang-Bae. “STOCHASTIC DYNAMIC PROGRAMMING (SDP) AND SAMPLE STOCHASTIC DYNAMIC PROGRAMMING (SSDP) FOR OPTIMIZATION OF KOREAN HYDROPOWER PLANT.” 2017. Masters Thesis, Cornell University. Accessed January 24, 2021.
http://hdl.handle.net/1813/59071.
MLA Handbook (7th Edition):
Choi, Kwang-Bae. “STOCHASTIC DYNAMIC PROGRAMMING (SDP) AND SAMPLE STOCHASTIC DYNAMIC PROGRAMMING (SSDP) FOR OPTIMIZATION OF KOREAN HYDROPOWER PLANT.” 2017. Web. 24 Jan 2021.
Vancouver:
Choi K. STOCHASTIC DYNAMIC PROGRAMMING (SDP) AND SAMPLE STOCHASTIC DYNAMIC PROGRAMMING (SSDP) FOR OPTIMIZATION OF KOREAN HYDROPOWER PLANT. [Internet] [Masters thesis]. Cornell University; 2017. [cited 2021 Jan 24].
Available from: http://hdl.handle.net/1813/59071.
Council of Science Editors:
Choi K. STOCHASTIC DYNAMIC PROGRAMMING (SDP) AND SAMPLE STOCHASTIC DYNAMIC PROGRAMMING (SSDP) FOR OPTIMIZATION OF KOREAN HYDROPOWER PLANT. [Masters Thesis]. Cornell University; 2017. Available from: http://hdl.handle.net/1813/59071
University of Illinois – Urbana-Champaign
20.
Dang, Qian.
Understanding linkages between trade and water resources.
Degree: PhD, Civil Engineering, 2018, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/101174
► Water is an essential input for agricultural production. Agriculture, in turn, is globalized through the trade of agricultural commodities. The relationship between international trade and…
(more)
▼ Water is an essential input for agricultural production. Agriculture, in turn, is globalized through the trade of agricultural commodities. The relationship between international trade and
water resources is an issue of great interest in the literature. Many studies focus on the relationship between trade and virtual
water resources, without direct consideration of domestic, physical
water resources. Now, there is a critical need to better understand the implications of trade for domestic (physical)
water use. As such, the main goal of this dissertation is to understand linkages between trade and
water resource both theoretically and empirically.
In this dissertation, I develop a theoretical model that emphasizes four tradeoffs involving
water-use decision-making that are important yet not always considered in a consistent framework. One tradeoff focuses on competition for
water among different economic sectors. A second tradeoff examines the possibility that certain types of agricultural investments can offset
water use. A third tradeoff explores the possibility that the rest of the world can be a source of supply or demand for a country's
water-using commodities. The fourth tradeoff concerns how variability in
water supplies influences farmer decision-making. I show conditions under which trade liberalization affect
water use. Two policy scenarios to reduce
water use are evaluated. First, I derive a target tax that reduces
water use without offsetting the gains from trade liberalization, although important tradeoffs exist between economic performance and resource use. Second, I show how subsidization of
water-saving technologies can allow producers to use less
water without reducing agricultural production, making such subsidization an indirect means of influencing
water use decision-making. Finally, I outline conditions under which riskiness of
water availability affects
water use. These theoretical model results generate hypotheses that can be tested empirically in future work.
I also contribute to the debate over globalization and the environment by asking: What is the impact of trade on national
water use and
water quality? To address this question I employ econometric methods to quantify the causal relationship between trade openness,
water use and nutrient use. Specifically, I use the instrumental variables methodology to evaluate the impact of trade openness on domestic
water withdrawals in agriculture and industry, national nitrate, phosphate and potash use in agriculture. I find that a one percentage point increase in trade openness leads to a 5.21% decrease in agricultural
water withdrawals. I find that trade openness reduces
water use in agriculture primarily through the intensive margin effect, by leading farmers to produce more with less
water, such as through the adoption of technology. I do not find evidence for extensive margin or crop mix impacts on agricultural
water withdrawals. Significantly, these results demonstrate that trade openness leads to less
water use in agriculture. However, for…
Advisors/Committee Members: Konar, Megan (advisor), Konar, Megan (Committee Chair), Sivapalan, Murugesu (committee member), Cai, Ximing (committee member), Deryugina, Tatyana (committee member).
Subjects/Keywords: Trade; Water resources
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Dang, Q. (2018). Understanding linkages between trade and water resources. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/101174
Chicago Manual of Style (16th Edition):
Dang, Qian. “Understanding linkages between trade and water resources.” 2018. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed January 24, 2021.
http://hdl.handle.net/2142/101174.
MLA Handbook (7th Edition):
Dang, Qian. “Understanding linkages between trade and water resources.” 2018. Web. 24 Jan 2021.
Vancouver:
Dang Q. Understanding linkages between trade and water resources. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2018. [cited 2021 Jan 24].
Available from: http://hdl.handle.net/2142/101174.
Council of Science Editors:
Dang Q. Understanding linkages between trade and water resources. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2018. Available from: http://hdl.handle.net/2142/101174
Texas A&M University
21.
Leidner, Andrew.
Economic Essays on Water Resources Management of the Texas Lower Rio Grande Valley.
Degree: PhD, Agricultural Economics, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10807
► The study area for this dissertation is the Texas Lower Rio Grande Valley (Valley). The overarching theme is water and includes regional water management, water…
(more)
▼ The study area for this dissertation is the Texas Lower Rio Grande Valley (Valley). The overarching theme is
water and includes regional
water management,
water management institutions, and
water supply decision-making as it relates to community well-being and public health.
The first essay provides a description of a control model developed for the management of a municipal
water supply system in the context of public health and waterborne illnesses issues. The most beneficial disease-management strategy is found to depend on the community's levels of infected population,
water services, and budget. The model is numerically parameterized using data drawn from Hidalgo County in the Valley. Greater capital depreciation rates and shorter planning horizons contribute to lower levels of community well-being, which is measured as the present value of damages from disease infection levels. Reductions in community well-being are greatest when greater capital depreciation rates are combined with shorter planning horizons.
The second essay provides an overview of the organizations, institutions, policies, and geographic particulars of the region's
water management system and the region's
water market. Demand growth for potable
water and a relatively-fixed supply of raw
water are reflected in increasing prices for domestic, municipal, and industrial (DMI)
water rights. The market is characterized by rising prices and the transfer of
water from lower-value to higher-value uses. Some reasons for the market's functionality are due to minimal return flows to the Rio Grande (River) occurring throughout the Valley, and the monitoring and enforcement efforts of the Rio Grande Watermaster Program.
The final essay is a presentation of a hydroeconomic model to study regional allocation of
water resources across the municipal and agricultural sectors of several counties in the Valley. Results indicate that anticipated population growth will increase demand for municipal
water and will motivate the transfer of
water from the agricultural sector to the municipal sector and the further development of brackish desalination of groundwater. Population density scenarios indicate greater population density is associated with a greater level of agricultural production and reduced revenue to agriculture from land and
water-right sales. On balance, climate change scenarios with population increases to 2060 are associated with fewer acres farmed, cropping pattern shifts to higher-value crops, and increasing irrigation requirements.
Since the study area for this dissertation is encountering a variety of challenges that are related to environmental conditions, institutions, demographics, and health, this dissertation may provide guidance to the broader
water-management community and to other locations, where these challenges are also occurring.
Advisors/Committee Members: Rister, M. Edward (advisor), Lacewell, Ronald D. (advisor), Harris, Bill L. (committee member), McCarl, Bruce A. (committee member).
Subjects/Keywords: Water Resources; Economics
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Manager
APA (6th Edition):
Leidner, A. (2012). Economic Essays on Water Resources Management of the Texas Lower Rio Grande Valley. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10807
Chicago Manual of Style (16th Edition):
Leidner, Andrew. “Economic Essays on Water Resources Management of the Texas Lower Rio Grande Valley.” 2012. Doctoral Dissertation, Texas A&M University. Accessed January 24, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10807.
MLA Handbook (7th Edition):
Leidner, Andrew. “Economic Essays on Water Resources Management of the Texas Lower Rio Grande Valley.” 2012. Web. 24 Jan 2021.
Vancouver:
Leidner A. Economic Essays on Water Resources Management of the Texas Lower Rio Grande Valley. [Internet] [Doctoral dissertation]. Texas A&M University; 2012. [cited 2021 Jan 24].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10807.
Council of Science Editors:
Leidner A. Economic Essays on Water Resources Management of the Texas Lower Rio Grande Valley. [Doctoral Dissertation]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10807
22.
Salgado-Herrera, Miriam.
Characterization of Bacteria Community and Evaluation of Anthropogenic and Natural Disturbances in Surface Waters Quality of Sabana River in the Luquillo Experimental Forest in Puerto Rico.
Degree: 2018, Universidad del Turabo (Puerto Rico)
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=10285300
► Characterization of bacteria community and evaluation of anthropogenic and natural disturbances in surface waters quality of Sabana River in the Luquillo Experimental Forest in…
(more)
▼ Characterization of bacteria community and evaluation of anthropogenic and natural disturbances in surface waters quality of Sabana River in the Luquillo Experimental Forest in Puerto Rico. This doctoral dissertation research focused on the bacterial characterization, and evaluation of anthropogenic, and natural disturbances in the surface waters quality of the Sabana River in the Luquillo Experimental Forest in Puerto Rico. Monthly samples were taken at seven stations along the river during one year, and physicochemical factors such as temperature, pH, conductivity, DO and salinity were measured to explore their effect in the bacterial community. The effect of recreation was evaluated at El Puente, and at La Paila in the Sabana River, and at Puente Roto in the Mameyes River, from August 4 to September 8, 2012. Samples were collected up-river (before), on-site, and down-river (after) primary contact recreation activity. The number of bathers, and the temperature of the water were recorded. Also, four monthly sampling events were conducted under low flow conditions between May 2015 and August 2015, at two sites in the Sabana River impacted by non-point sources. Terminal restriction fragment length polymorphism (T-RFLP), pyrosequencing, and Colilert and Enterolert Test-System, were used for the bacterial community characterization. It was found that number of phylotypes of the bacterial community increases from upriver to downriver as anthropogenic disturbances proliferate along the river, and that bacteria are adapted or acclimated to in situ temperature, dissolved oxygen, conductivity, salinity and pH, therefore, show little variation in time and space. Pyrosequncing revealed that a total of 12 bacteria classes, 27 orders, 33 families, 82 genera and 186 species were found in the Sabana River. There is an increase in families and species through the three stations, with the largest amounts observed downriver at station 7. <i>Vogesella</i> spp. was the most abundant specie at the three stations, with 59% at station # 1, 67% at station # 4, and 53% at station # 7. A significant positive and strong correlation was found between the amount of <i>E. coli</i> and the number of bathers at MPRS (R = 0.919; p-value = 0.027), which means that a high number of bathers coincides with a high concentration of <i> E.coli</i>. Also, there is a significant positive and strong correlation between the concentration of <i>Enterococci</i> and the number of bathers at Pai.S (R is 0.908; p-value = 0.033). There were not significant differences between the bacterial community up-river, on site and down river of the two non-point sources.
Subjects/Keywords: Water resources management
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Manager
APA (6th Edition):
Salgado-Herrera, M. (2018). Characterization of Bacteria Community and Evaluation of Anthropogenic and Natural Disturbances in Surface Waters Quality of Sabana River in the Luquillo Experimental Forest in Puerto Rico. (Thesis). Universidad del Turabo (Puerto Rico). Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=10285300
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Salgado-Herrera, Miriam. “Characterization of Bacteria Community and Evaluation of Anthropogenic and Natural Disturbances in Surface Waters Quality of Sabana River in the Luquillo Experimental Forest in Puerto Rico.” 2018. Thesis, Universidad del Turabo (Puerto Rico). Accessed January 24, 2021.
http://pqdtopen.proquest.com/#viewpdf?dispub=10285300.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Salgado-Herrera, Miriam. “Characterization of Bacteria Community and Evaluation of Anthropogenic and Natural Disturbances in Surface Waters Quality of Sabana River in the Luquillo Experimental Forest in Puerto Rico.” 2018. Web. 24 Jan 2021.
Vancouver:
Salgado-Herrera M. Characterization of Bacteria Community and Evaluation of Anthropogenic and Natural Disturbances in Surface Waters Quality of Sabana River in the Luquillo Experimental Forest in Puerto Rico. [Internet] [Thesis]. Universidad del Turabo (Puerto Rico); 2018. [cited 2021 Jan 24].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10285300.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Salgado-Herrera M. Characterization of Bacteria Community and Evaluation of Anthropogenic and Natural Disturbances in Surface Waters Quality of Sabana River in the Luquillo Experimental Forest in Puerto Rico. [Thesis]. Universidad del Turabo (Puerto Rico); 2018. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10285300
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
West Virginia University
23.
Miller, Eric Mitchell.
Ecological Benefits of Mitigation on a Large River Mainstem in an Intensively Mined Appalachian Watershed.
Degree: MS, Wildlife and Fisheries Resources, 2011, West Virginia University
URL: https://doi.org/10.33915/etd.321
;
https://researchrepository.wvu.edu/etd/321
► Large scale surface mining in the central Appalachians causes significant alteration of headwater catchments, and these impacts may be offset through implementation of stream restoration…
(more)
▼ Large scale surface mining in the central Appalachians causes significant alteration of headwater catchments, and these impacts may be offset through implementation of stream restoration projects. As an example, several habitat enhancement structures (cross-vanes and j-hooks) were constructed along a 13.7 km section of the Little Coal River as mitigation for mining impacts in the region. The objectives of our study were to: 1-quantify changes in channel morphology, habitat quality, sediment composition, bank stability, biological communities and organic matter processing in response to habitat enhancing structures; 2-relate changes in structural and functional attributes of the Little Coal River mainstem to losses resulting from mining impacts to headwater catchments; and 3-develop a long term restoration monitoring plan for the Little Coal River. The study area included three 1.5 – 2 km segments along the Little Coal River mainstem. The upstream segment contained 15 habitat enhancement structures that were constructed between 2005-2006. The downstream segment contained no structures at the beginning of the study (Spring 2009). Twenty structures were then constructed in the downstream segment during late Fall 2009 and Spring 2010. The middle segment contained no structures and served as our reference. Sampling for physical, chemical, and biological attributes occurred seasonally from Spring 2009 – Fall 2010. Our results indicate that the beneficial effects of structures included: increased fish habitat quality and bed complexity, increased substrate diversity, and increased macroinvertebrate biomass and diversity associated with substrate changes. Most measures of fish assemblages did not respond to restoration actions. Poor
water quality in the form of elevated sulfates and total dissolved solids (TDS) may be a critical factor limiting ecological benefits of habitat restoration in the Little Coal River. Furthermore, traditional measures of headwater function, such as organic matter decomposition and retention, were not significantly affected by structural enhancement actions. Consequently, effective management of aquatic
resources in the central Appalachians must couple habitat restoration projects on larger river mainstems with protection of headwater catchment functions and effective management of
water quality at a watershed scale.
Advisors/Committee Members: J. Todd Petty, Kyle J. Hartman, J. Steven Kite.
Subjects/Keywords: Water resources management
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APA (6th Edition):
Miller, E. M. (2011). Ecological Benefits of Mitigation on a Large River Mainstem in an Intensively Mined Appalachian Watershed. (Thesis). West Virginia University. Retrieved from https://doi.org/10.33915/etd.321 ; https://researchrepository.wvu.edu/etd/321
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Miller, Eric Mitchell. “Ecological Benefits of Mitigation on a Large River Mainstem in an Intensively Mined Appalachian Watershed.” 2011. Thesis, West Virginia University. Accessed January 24, 2021.
https://doi.org/10.33915/etd.321 ; https://researchrepository.wvu.edu/etd/321.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Miller, Eric Mitchell. “Ecological Benefits of Mitigation on a Large River Mainstem in an Intensively Mined Appalachian Watershed.” 2011. Web. 24 Jan 2021.
Vancouver:
Miller EM. Ecological Benefits of Mitigation on a Large River Mainstem in an Intensively Mined Appalachian Watershed. [Internet] [Thesis]. West Virginia University; 2011. [cited 2021 Jan 24].
Available from: https://doi.org/10.33915/etd.321 ; https://researchrepository.wvu.edu/etd/321.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Miller EM. Ecological Benefits of Mitigation on a Large River Mainstem in an Intensively Mined Appalachian Watershed. [Thesis]. West Virginia University; 2011. Available from: https://doi.org/10.33915/etd.321 ; https://researchrepository.wvu.edu/etd/321
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Minnesota
24.
Li, Hongyu.
Organic matter biogeochemical characteristics in Lake Superior: insights into composition, source and reactivity.
Degree: PhD, Water Resources Science, 2014, University of Minnesota
URL: http://hdl.handle.net/11299/167227
► Organic matter (OM) composition and its relationship with OM source and dynamics in Lake Superior were investigated with the combination of advanced spectroscopic techniques and…
(more)
▼ Organic matter (OM) composition and its relationship with OM source and dynamics in Lake Superior were investigated with the combination of advanced spectroscopic techniques and multiple-geochemical signatures. Studies of water-column dissolved, water-column particulate, and sedimentary organic matter (DOM, POM, and SOM, respectively) were performed. The composition of DOM obtained with two different solid phase extraction resins (C18 vs SDB-XC) was investigated using Uv-visible spectrometry and negative-ion electrospray Fourier transform ion cyclotron resonance mass spectrometry (ESI FT-ICR MS). Lake Superior raw offshore water was found to be very clear; its DOM is low in aromaticity, with primarily non-humic, hydrophilic and low molecular weight materials. Radiocarbon signatures reveal the primarily modern (post-bomb) nature of Lake Superior DOM. With such Lake Superior water, we found SDB-XC disks to outperform C18 disks in the isolation of DOC in terms of both higher recovery and less degree of fractionation to the initial DOM composition. Extracts of the same samples obtained with the different extraction disks share 70% of compounds, which were dominated by lignin-CRAM-like material but also include a variety of other functional groups including lipids, proteins, carbohydrates and condensed hydrocarbon. To assess settling particulate organic matter seasonality and availability to the benthic community, settling particulate matter was studied in terms of mass fluxes and main biochemical characteristics and composition at two Lake Superior offshore sites over the course of a year. Increase in sinking flux was variably associated with sediment resuspension and enhanced surface production. The combination of PCHO-C%, THAA and Fourier transform infrared spectroscopy (FTIR) data revealed that the relative bioavailability and nutritional values of POM to benthic microbes should be lower in spring than summer, although both periods exhibited high sinking fluxes. Isotopic and elemental analyses, FTIR, principal components analysis (PCA), and two dimensional (2D) correlation analysis, where core depth was used as perturbation, were used to study the diagenesis of organic matter (OM) in Lake Superior sediments. Depth-related changes among sites were found to be similar, leading to an increased contribution from inorganic (and possibly refractory aromatic organic) components at each site, and a loss of contribution from other organic components. Synchronous spectra reveal that aliphatic esters and carbohydrates degrade significantly with increasing depth, leading to an increased contribution from clays/ biogenic silica/ inactive carbohydrates. Asynchronous spectra show that, generally, carboxyl groups, including aliphatic ester and amide/protein, degrade first, followed by a group of carbohydrates, and then aromatic compounds and/ or the Si-O framework in clays and biogenic silica.
Subjects/Keywords: Water resources science
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APA (6th Edition):
Li, H. (2014). Organic matter biogeochemical characteristics in Lake Superior: insights into composition, source and reactivity. (Doctoral Dissertation). University of Minnesota. Retrieved from http://hdl.handle.net/11299/167227
Chicago Manual of Style (16th Edition):
Li, Hongyu. “Organic matter biogeochemical characteristics in Lake Superior: insights into composition, source and reactivity.” 2014. Doctoral Dissertation, University of Minnesota. Accessed January 24, 2021.
http://hdl.handle.net/11299/167227.
MLA Handbook (7th Edition):
Li, Hongyu. “Organic matter biogeochemical characteristics in Lake Superior: insights into composition, source and reactivity.” 2014. Web. 24 Jan 2021.
Vancouver:
Li H. Organic matter biogeochemical characteristics in Lake Superior: insights into composition, source and reactivity. [Internet] [Doctoral dissertation]. University of Minnesota; 2014. [cited 2021 Jan 24].
Available from: http://hdl.handle.net/11299/167227.
Council of Science Editors:
Li H. Organic matter biogeochemical characteristics in Lake Superior: insights into composition, source and reactivity. [Doctoral Dissertation]. University of Minnesota; 2014. Available from: http://hdl.handle.net/11299/167227
University of Minnesota
25.
Erickson, Jeremy Michael.
Stream Metabolism Along an Urban to Rural Gradient in Lake Superior Tributary Streams.
Degree: MS, Water Resources Science, 2011, University of Minnesota
URL: http://purl.umn.edu/104193
► The North Shore streams of Lake Superior are known for their clear cool waters that flow through expanses of undeveloped land. However, many North Shore…
(more)
▼ The North Shore streams of Lake Superior are known for their clear cool waters that flow through expanses of undeveloped land. However, many North Shore watersheds are experiencing rapid urbanization, resulting in increased impervious surface cover (ISC). Previous research on the impact of ecological disturbances on stream health have seldom focused on ecosystem processes such as stream metabolism. This study assesses the effect of increasing urbanization on whole stream community respiration (CR) and gross primary production (GPP) rates during summer and autumn base flow periods for nine low productivity, heterotrophic streams spanning a watershed ISC gradient. Land cover was measured as a percentage of the whole watershed and by distance-weighting to evaluate the possible influence of spatial position of land cover on stream function. Stream metabolism rates were determined using high frequency diel dissolved oxygen changes at a single station coupled with propane evasion to estimate stream reaeration rates. GPP estimates ranged from 0.02 to 2.02 g O2 m-2d-1 and CR from 0.17 to 6.09 g O2 m-2d-1. During summer base flows there were strong correlations between urban development measures and both stream metabolism and nutrients. However, the associations between land use and stream metabolism were not observed during the autumn base flow period. Our data suggest the variability in stream flow and leaf off along with stream temperature changes appear to be the dominant factors influencing the relationship between land use and stream metabolism in these Lake Superior tributary streams. Distance-weighting did not improve the predictive power on stream metabolism and water chemistry variables.
Subjects/Keywords: Water Resources Science
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Manager
APA (6th Edition):
Erickson, J. M. (2011). Stream Metabolism Along an Urban to Rural Gradient in Lake Superior Tributary Streams. (Masters Thesis). University of Minnesota. Retrieved from http://purl.umn.edu/104193
Chicago Manual of Style (16th Edition):
Erickson, Jeremy Michael. “Stream Metabolism Along an Urban to Rural Gradient in Lake Superior Tributary Streams.” 2011. Masters Thesis, University of Minnesota. Accessed January 24, 2021.
http://purl.umn.edu/104193.
MLA Handbook (7th Edition):
Erickson, Jeremy Michael. “Stream Metabolism Along an Urban to Rural Gradient in Lake Superior Tributary Streams.” 2011. Web. 24 Jan 2021.
Vancouver:
Erickson JM. Stream Metabolism Along an Urban to Rural Gradient in Lake Superior Tributary Streams. [Internet] [Masters thesis]. University of Minnesota; 2011. [cited 2021 Jan 24].
Available from: http://purl.umn.edu/104193.
Council of Science Editors:
Erickson JM. Stream Metabolism Along an Urban to Rural Gradient in Lake Superior Tributary Streams. [Masters Thesis]. University of Minnesota; 2011. Available from: http://purl.umn.edu/104193
University of Minnesota
26.
Wein, Sarah Nicole Panzer.
Targeting Audiences for Improved Lawn Management: Can Grouping Households Assist with Nonpoint Water Pollution Reduction.
Degree: MS, Water Resources Science, 2011, University of Minnesota
URL: http://purl.umn.edu/104297
► In urban ecosystems, households are important decision-making units that are resource consumers and contributors to urban water pollution. At the landscape level, individual household choices…
(more)
▼ In urban ecosystems, households are important decision-making units that are resource
consumers and contributors to urban water pollution. At the landscape level, individual
household choices regarding lawn management vary greatly, contributing to the
detriment or protection of water resources. To better target household behavior change,
we need to understand the social influences that determine how and why households
manage their lawns differently, and what characteristics of the household could be
driving these differences. We suggest that a better understanding of households could
inform targeted policies and programs for effective change strategies. By spatially
examining income, house age and proximity to a lake, we analyzed whether household
groupings reflect households that think and act in similar ways with respect to lawn
management. We obtained data for this research through a 2008 mail survey completed
by the Twin Cities Household Ecosystem Project in Ramsey and Anoka Counties,
Minnesota. Responses to questions pertaining to fertilization, leaf and lawn clipping
management, vegetation choice, and lawn management attitudes were analyzed. When
households were grouped spatially across the landscape with respect to proximity to a
lake, few significant differences were found between household groups within 200 meters
vs. farther than 200 meters. While income did influence particular lawn management
attitudes and behaviors, it did not group spatially at a county scale, or at the finer scale of
Saint Paul, the major city in our study area. House age showed significant relationships
with almost every attitude and behavior examined, and was the only factor to demonstrate
important spatial grouping. The correlation of house age with lawn attitudes/behaviors,
however, is partially an artifact of housing density and number of trees on a household’s
property. This study demonstrates that it may be possible to target households based on
particular factors in order to tailor educational programming and policy to influence lawn
management behavior, reduce pollutants leaving household lawns, and therefore improve
water quality.
Subjects/Keywords: Water Resources Science
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APA (6th Edition):
Wein, S. N. P. (2011). Targeting Audiences for Improved Lawn Management: Can Grouping Households Assist with Nonpoint Water Pollution Reduction. (Masters Thesis). University of Minnesota. Retrieved from http://purl.umn.edu/104297
Chicago Manual of Style (16th Edition):
Wein, Sarah Nicole Panzer. “Targeting Audiences for Improved Lawn Management: Can Grouping Households Assist with Nonpoint Water Pollution Reduction.” 2011. Masters Thesis, University of Minnesota. Accessed January 24, 2021.
http://purl.umn.edu/104297.
MLA Handbook (7th Edition):
Wein, Sarah Nicole Panzer. “Targeting Audiences for Improved Lawn Management: Can Grouping Households Assist with Nonpoint Water Pollution Reduction.” 2011. Web. 24 Jan 2021.
Vancouver:
Wein SNP. Targeting Audiences for Improved Lawn Management: Can Grouping Households Assist with Nonpoint Water Pollution Reduction. [Internet] [Masters thesis]. University of Minnesota; 2011. [cited 2021 Jan 24].
Available from: http://purl.umn.edu/104297.
Council of Science Editors:
Wein SNP. Targeting Audiences for Improved Lawn Management: Can Grouping Households Assist with Nonpoint Water Pollution Reduction. [Masters Thesis]. University of Minnesota; 2011. Available from: http://purl.umn.edu/104297
University of Minnesota
27.
Li, Jiying.
Diagenesis and sediment-water exchanges in organic-poor sediments of Lake Superior.
Degree: MS, Water resources science, 2011, University of Minnesota
URL: http://purl.umn.edu/114087
► To investigate early diagenetic processes and the spatial and temporal variability in organic-poor sediments of Lake Superior, we have repeatedly sampled sediments at 8 locations…
(more)
▼ To investigate early diagenetic processes and the spatial and temporal variability
in organic-poor sediments of Lake Superior, we have repeatedly sampled sediments at 8
locations across the lake. Sediment geochemistry was characterized by the penetration
depths and uptake rates of oxygen, and the distributions of organic carbon, dissolved
Fe(II), nitrate, ammonium, soluble reactive phosphate (SRP), and solid phase
Fe(III)/Fe(II) and phosphorus. Oxygen penetrated deeply into the sediments at all
locations: from ~3.5 cm at near-shore stations to >12 cm in the deep basins. The total
oxygen uptake ranged from 4.44 mmol m-2 d-1 to 7.68 mmol m-2 d-1, averaging 6.10
mmol m-2 d-1. Diffusive oxygen flux averaged 2.92 ± 0.75 mmol m-2 d-1. Aerobic
respiration accounted for >90-95% of the total carbon degradation, with denitrification
and iron reduction contributing <5% of the total carbon degradation. Reactivity of the
organic carbon in the upper 1 cm of sediment was calculated to be ~ 1.2 yr-1, which is
typical for organic material less than a year old. Sediment carbon degradation rate of
5.29± 1.20 mmol m-2 d-1 corresponds to ~ 19% of the recently estimated primary
production. More than ~ 90% of carbon reaching the lake floor is mineralized, with a
sediment carbon burial flux of 0.49 mmol m-2 d-1. Diffusive fluxes of nitrate from
sediment into the overlying water averaged 0.17± 0.07 mmol m-2 d-1, recycling ~ 40% of
nitrogen sedimentation flux. Phosphorus cycling was strongly associated with the
diagenetic cycling of iron. Sediment diffusive effluxes of SRP were small (< ~ 1.5 x 10-3
mmol m-2 d-1) and similar among stations. The efficient trapping of phosphorus in the sediment is interpreted as a result of strong adsorption of phosphorus by iron
(hydro)oxides. Sediments in Lake Superior exhibit strong spatial heterogeneity on spatial
scales down to hundreds of meters. The presence of multiple Fe- and Mn-rich layers,
forming dense crusts and often visible to the naked eye, suggests decadal or longer
variations in the sediment’s physical or redox environment. Oxygen diffusive fluxes and
carbon degradation rates exhibited strong seasonality, with higher oxygen fluxes and
carbon degradation rates in July, and the depth of oxygen penetration varied by several
mm to cm.
Subjects/Keywords: Water resources science
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APA (6th Edition):
Li, J. (2011). Diagenesis and sediment-water exchanges in organic-poor sediments of Lake Superior. (Masters Thesis). University of Minnesota. Retrieved from http://purl.umn.edu/114087
Chicago Manual of Style (16th Edition):
Li, Jiying. “Diagenesis and sediment-water exchanges in organic-poor sediments of Lake Superior.” 2011. Masters Thesis, University of Minnesota. Accessed January 24, 2021.
http://purl.umn.edu/114087.
MLA Handbook (7th Edition):
Li, Jiying. “Diagenesis and sediment-water exchanges in organic-poor sediments of Lake Superior.” 2011. Web. 24 Jan 2021.
Vancouver:
Li J. Diagenesis and sediment-water exchanges in organic-poor sediments of Lake Superior. [Internet] [Masters thesis]. University of Minnesota; 2011. [cited 2021 Jan 24].
Available from: http://purl.umn.edu/114087.
Council of Science Editors:
Li J. Diagenesis and sediment-water exchanges in organic-poor sediments of Lake Superior. [Masters Thesis]. University of Minnesota; 2011. Available from: http://purl.umn.edu/114087
University of Minnesota
28.
Newman, Brian J.
Biofilm ecoenzymatic activity, organic carbon and nitrogen in Lake Superior tributary streams.
Degree: MS, 2011, University of Minnesota
URL: http://purl.umn.edu/117076
► I compared the ecoenzymatic activity of naturally occurring epilithic biofilm to stream water carbon and nitrogen concentrations in Lake Superior tributary streams along the south…
(more)
▼ I compared the ecoenzymatic activity of naturally occurring epilithic biofilm to stream water carbon and nitrogen concentrations in Lake Superior tributary streams along the south and north shores of the western end of Lake Superior. My goal was to determine if the ecoenzymatic activity of biofilm would reflect water chemistry. The streams drain catchments ranging in size from 14-172 km2 of primarily deciduous forest, coniferous forest and woody wetlands. Measurements and samples were collected during base stream flows (June-September). The streams represented a broad range of organic carbon, nitrogen and phosphorous concentrations, which correlated to physical habitat parameters and land usage. I used light absorbance in the ultraviolet and visible light (UV-VIS) spectrum to show differences in dissolved organic matter (DOM) between sites on the north and south shore. The UV-VIS proxies of E2:E3 and SUVA254, which indicate molecular size and degree of aromaticity, were correlated with the percentage of wetlands in the catchment, as well as the specific conductance, pH and the C, N and P concentrations in the water. Eleven different ecoenzymes involved in the breakdown of organic matter were measured. The activities of these enzymes were often positively correlated to each other and correlated to the measured water chemistry. The slopes from Type II linear regression of β-N-acetylglucosaminidase to phosphatase (0.77), β-d-glucosidase to phosphatase (0.68), and -d-glucosidase to β-N-acetylglucosaminidase (0.88) are presented here as metabolic stoichiometric ratios. The molar C:N ratio in epilithic biofilm (11:1) was positively correlated to the ratio of dissolved organic carbon to total dissolved nitrogen (DOC:TDN) in filtered (<0.45 μm) stream water and negatively correlated with biofilm peptidase activity. The expression of the peptidase activity by both L-alanine aminopeptidase and L-leucine aminopeptidase increased in response to dissolved organic nitrogen (DON). Increasing stream-water inorganic nitrogen (DIN) concentrations reduced or inhibited L-alanine aminopeptidase expression and had no apparent influence on L-leucine aminopeptidase. These results along with other studies of biofilm show that the ecoenzymatic activity of biofilm and the C:N ratio in biofilm reflects water chemistry, providing further evidence linking the stoichiometric theory of ecology to metabolic theories of ecology. The ecoenzymatic activity is a measurement of metabolic requirements mediating the stoichiometry of incorporation of nutrients by the biofilm. This study was the first to compare natural epilithic biofilm ecoenzyme activity in the Lake Superior region to water chemistry, land use and habitat characteristics.
Subjects/Keywords: Water resources science
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APA (6th Edition):
Newman, B. J. (2011). Biofilm ecoenzymatic activity, organic carbon and nitrogen in Lake Superior tributary streams. (Masters Thesis). University of Minnesota. Retrieved from http://purl.umn.edu/117076
Chicago Manual of Style (16th Edition):
Newman, Brian J. “Biofilm ecoenzymatic activity, organic carbon and nitrogen in Lake Superior tributary streams.” 2011. Masters Thesis, University of Minnesota. Accessed January 24, 2021.
http://purl.umn.edu/117076.
MLA Handbook (7th Edition):
Newman, Brian J. “Biofilm ecoenzymatic activity, organic carbon and nitrogen in Lake Superior tributary streams.” 2011. Web. 24 Jan 2021.
Vancouver:
Newman BJ. Biofilm ecoenzymatic activity, organic carbon and nitrogen in Lake Superior tributary streams. [Internet] [Masters thesis]. University of Minnesota; 2011. [cited 2021 Jan 24].
Available from: http://purl.umn.edu/117076.
Council of Science Editors:
Newman BJ. Biofilm ecoenzymatic activity, organic carbon and nitrogen in Lake Superior tributary streams. [Masters Thesis]. University of Minnesota; 2011. Available from: http://purl.umn.edu/117076
University of Minnesota
29.
Hartzheim, Paul Matthew.
Application of household flux calculator in determining variability in annual carbon, nitrogen, and phosphorus flux through Falcon Heights, Minnesota households.
Degree: MS, Water resources science, 2011, University of Minnesota
URL: http://purl.umn.edu/120087
► As human population has continued to grow and become increasingly more metropolitan, urban ecosystems have become an increasingly important contributor to air and water pollution…
(more)
▼ As human population has continued to grow and become increasingly more
metropolitan, urban ecosystems have become an increasingly important contributor to air
and water pollution on a local, regional, and global scale. As such, households provide a
useful unit of study, and quantifying environmental impacts from individual households
helps provide a clearer picture of what individual household decisions have the largest
impact to air and water quality.
In this study, a group of University of Minnesota research fellows conducted a
series of interviews and field surveys of single-family homeowners in the city of Falcon
Heights, Minnesota. The surveys were constructed by a team of faculty members and
research associates, for the purpose of collecting detailed information on household
consumption, behaviors, and attitudes. The survey was developed to obtain information
that could be translated into quantitative data to determine overall flux of carbon (C),
nitrogen (N) and phosphorus (P) as they relate to household activities and personal
choices. For purposes of this thesis, we define “flux” as the quantitative measurement of
inputs and outputs through the household unit, including any portions that are sequestered within or exported from the household. Surveys were conducted with 34 households; 6
or which were eliminated from this analysis due to incomplete data.
Approximately 40 variables gathered from the surveys were quantified and
directly inputted into the Household Flux Calculator (HFC), a spreadsheet accounting
model which was developed as part of this study to estimate the overall fluxes of C, N,
and P for each household. This thesis analyzes the variability of C, N, and P flux among
the households surveyed, and highlights household activities that have the greatest influence on the inputs and outputs of household C, N, and P, with the goal of developing
a better understanding of how decisions and choices made on a household level impact
local, regional, and global environments.
Subjects/Keywords: Water resources science
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APA (6th Edition):
Hartzheim, P. M. (2011). Application of household flux calculator in determining variability in annual carbon, nitrogen, and phosphorus flux through Falcon Heights, Minnesota households. (Masters Thesis). University of Minnesota. Retrieved from http://purl.umn.edu/120087
Chicago Manual of Style (16th Edition):
Hartzheim, Paul Matthew. “Application of household flux calculator in determining variability in annual carbon, nitrogen, and phosphorus flux through Falcon Heights, Minnesota households.” 2011. Masters Thesis, University of Minnesota. Accessed January 24, 2021.
http://purl.umn.edu/120087.
MLA Handbook (7th Edition):
Hartzheim, Paul Matthew. “Application of household flux calculator in determining variability in annual carbon, nitrogen, and phosphorus flux through Falcon Heights, Minnesota households.” 2011. Web. 24 Jan 2021.
Vancouver:
Hartzheim PM. Application of household flux calculator in determining variability in annual carbon, nitrogen, and phosphorus flux through Falcon Heights, Minnesota households. [Internet] [Masters thesis]. University of Minnesota; 2011. [cited 2021 Jan 24].
Available from: http://purl.umn.edu/120087.
Council of Science Editors:
Hartzheim PM. Application of household flux calculator in determining variability in annual carbon, nitrogen, and phosphorus flux through Falcon Heights, Minnesota households. [Masters Thesis]. University of Minnesota; 2011. Available from: http://purl.umn.edu/120087
University of Minnesota
30.
Van Der Werff, Jessica.
Spatial and temporal dynamics of phytoplankton nutrient status in the deep chlorophyll layer (DCL) of Lake Superior.
Degree: MS, 2011, University of Minnesota
URL: http://purl.umn.edu/120529
► Total phosphorus and chlorophyll have been declining over the last few decades in the ultra-oligotrophic Lake Superior. A region in the water column where chlorophyll…
(more)
▼ Total phosphorus and chlorophyll have been declining over the last few decades in the ultra-oligotrophic Lake Superior. A region in the water column where chlorophyll exceeds that of the mixed layer during the stratified period, referred to in this study as the deep chlorophyll layer (DCL), is presumably ideal in terms of nutrients and light for primary producers. Investigating the nutrient status of these primary producers could aid in understanding the nutrient dynamics in this large, low nutrient lake. Lake nutrient concentration and phytoplankton nutrient status measurements were determined to evaluate seasonal, temporal, and spatial patterns both across the lake and with depth. Additionally, active fluorometry was measured in order to compare its efficacy as a nutrient status indicator with more traditional methods. Water samples were collected above, within, and below the DCL across the lake during the summer of 2010. Chemical analyses including chlorophyll a, particulate nutrients (carbon, nitrogen, and phosphorus), soluble reactive phosphorus, total and total dissolved phosphorus, total and total dissolved nitrogen, ammonium, nitrate, and soluble reactive silica were performed in conjunction with bioassays (N and P debt, alkaline phosphatase activity) and active fluorometry (PhytoPAM) to fully assess phytoplankton nutrient status. Results indicated extreme P deficiency across the lake in the epilimnion and metalimnion with the most extreme deficiency seeming to occur in the epilimnion and occasional deficiency in the hypolimnion. Also, a P deficiency indicator exhibited a diurnal pattern with higher deficiency during the daytime. Deficiency also appeared to be highest in the spring and decline over the course of the summer; however, even in September, samples still indicated extreme deficiency. Additionally, N debt data suggests N deficiency in spring which had disappeared by August. Active fluorometry was consistent with nutrient bioassays in suggesting that the epilimnion was more stressed than the metalimnion or hypolimnion. Strong nutrient concentration gradients across the lake and with depth as well as with time were absent, although there appears to be a seasonal decrease in SRP, nitrate, and silica and an increase in TN and TDN from June to September. Nutrient concentration and phytoplankton nutrient status could have been influenced by many factors in Lake Superior including a seasonal shift in algal species composition, zooplankton nutrient translocation, contribution to deficiency by picobacterioplankton, borderline iron (Fe) limitation, and reallocation of nutrients for purposes other than photochemistry.
Subjects/Keywords: Water Resources science
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APA (6th Edition):
Van Der Werff, J. (2011). Spatial and temporal dynamics of phytoplankton nutrient status in the deep chlorophyll layer (DCL) of Lake Superior. (Masters Thesis). University of Minnesota. Retrieved from http://purl.umn.edu/120529
Chicago Manual of Style (16th Edition):
Van Der Werff, Jessica. “Spatial and temporal dynamics of phytoplankton nutrient status in the deep chlorophyll layer (DCL) of Lake Superior.” 2011. Masters Thesis, University of Minnesota. Accessed January 24, 2021.
http://purl.umn.edu/120529.
MLA Handbook (7th Edition):
Van Der Werff, Jessica. “Spatial and temporal dynamics of phytoplankton nutrient status in the deep chlorophyll layer (DCL) of Lake Superior.” 2011. Web. 24 Jan 2021.
Vancouver:
Van Der Werff J. Spatial and temporal dynamics of phytoplankton nutrient status in the deep chlorophyll layer (DCL) of Lake Superior. [Internet] [Masters thesis]. University of Minnesota; 2011. [cited 2021 Jan 24].
Available from: http://purl.umn.edu/120529.
Council of Science Editors:
Van Der Werff J. Spatial and temporal dynamics of phytoplankton nutrient status in the deep chlorophyll layer (DCL) of Lake Superior. [Masters Thesis]. University of Minnesota; 2011. Available from: http://purl.umn.edu/120529
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Open Access Theses and Dissertations
