You searched for subject:(groundwater flow).
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University of Texas – Austin
1.
-7553-4195.
Groundwater flow controls on coastal water quality and global groundwater ages.
Degree: PhD, Geological Sciences, 2015, University of Texas – Austin
URL: http://hdl.handle.net/2152/45858 
► Humanity relies on groundwater. But, current consumption may be outpacing groundwater renewal rates, and anthropogenic activities are altering its quality. This dissertation advances the state…
(more)
▼ Humanity relies on
groundwater. But, current consumption may be outpacing
groundwater renewal rates, and anthropogenic activities are altering its quality. This dissertation advances the state of knowledge of how local and regional
groundwater dynamics affect its quality and quantity. First, I investigate
groundwater discharge patterns and fluxes in three lakes in the Nebraska Sand Hills region and on the island of Rarotonga, Cook Islands, to understand the hydrologic connection between
groundwater and surface water in these lacustrine and coastal settings. In Nebraska, I use electrical geophysical methods to characterize the spatial signature of
groundwater recharge and discharge to and from the lakes using
groundwater salinity patterns. On Rarotonga, a detailed field study of
groundwater flow at the intertidal zone shows how
groundwater flow influences the thermal regimes of nearshore environments, affecting the biota that live and chemical processes that occur near and below this dynamic interface. Next, a dense network of geophysical surveys across the coastal plain and into the lagoon on Rarotonga constrains multiple features of the larger-scale hydrologic system that are primarily controlled by the local carbonate and volcanic geology on the island. Finally, I give the first estimate of the global storage and spatial distribution of
groundwater with a mean age since recharge of less than fifty years. I use several thousand two-dimensional
groundwater flow and age-as-mass transport simulations parameterized by the best available hydrologic and geologic datasets. This global analysis suggested that ~6% of the
groundwater stored in the upper 2 km of the Earth’s crust is younger than 50 years. Comparing this young
groundwater storage to current
groundwater depletion rates indicates that more than half of the irrigated areas depending significantly on
groundwater could have already used up all of the young
groundwater and are using
groundwater more quickly than the storage is replenished. Together, these studies advance how to quantify
groundwater as a renewable resource through the global estimation of
groundwater storage associated with certain timespans and by analyzing the implications of
groundwater flow on water quantity and quality in field settings.
Advisors/Committee Members: Cardenas, Meinhard Bayani, 1977- (advisor), Gleeson, Thomas P (committee member), Hesse, Marc A (committee member), Paine, Jeffrey G (committee member), Sharp, John M (committee member).
Subjects/Keywords: Groundwater; Hydrology; Submarine groundwater discharge; Electrical resistivity; Coastal groundwater; Groundwater age; Groundwater renewability; Groundwater dynamics; Groundwater storage; Groundwater flow
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APA (6th Edition):
-7553-4195. (2015). Groundwater flow controls on coastal water quality and global groundwater ages. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/45858
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Chicago Manual of Style (16th Edition):
-7553-4195. “Groundwater flow controls on coastal water quality and global groundwater ages.” 2015. Doctoral Dissertation, University of Texas – Austin. Accessed February 27, 2021.
http://hdl.handle.net/2152/45858.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
MLA Handbook (7th Edition):
-7553-4195. “Groundwater flow controls on coastal water quality and global groundwater ages.” 2015. Web. 27 Feb 2021.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Vancouver:
-7553-4195. Groundwater flow controls on coastal water quality and global groundwater ages. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2015. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/2152/45858.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Council of Science Editors:
-7553-4195. Groundwater flow controls on coastal water quality and global groundwater ages. [Doctoral Dissertation]. University of Texas – Austin; 2015. Available from: http://hdl.handle.net/2152/45858
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Delft University of Technology
2.
Van Ballaer, A. (author).
Monitoring Groundwater flow with ERT.
Degree: 2020, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:68835460-920e-4799-8f44-39d6dbf74d36
► Geophysical monitoring is a popular tool in aquifer characterization and groundwater flow. To address this objective at groundwater extraction site ‘t Klooster, an ERT dataset…
(more)
▼ Geophysical monitoring is a popular tool in aquifer characterization and
groundwater flow. To address this objective at
groundwater extraction site ‘t Klooster, an ERT dataset was analyzed to identify
groundwater flow patterns resulting from the injection of warm oxygenated water. Using a petrophysical model, changes in resistivity were converted to estimated temperature changes to visualize the spread of warm oxygenated water. Multi-dimensional analysis of the resistivity response of the subsurface was carried out. This allowed for the division of the subsurface into 4 depth regimes according to their response to well activity. It is shown that wells up to 100m removed from the ERT set-up influenced the temperature distribution. Furthermore, injected oxygenated water highlighted a preferential
flow path between the depths of 20 and 35m in a north-west direction. This is in line with global
groundwater flow in the area.
Groundwater flow effects could not be reliably separated from the effect of well activity, however its effect is recognized both during extraction of
groundwater and injection of warm water.
Advisors/Committee Members: Slob, E.C. (mentor), Karaoulis, Marios (mentor), Draganov, D.S. (graduation committee), Wagner, Florian (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: Electrical resistivity tomography; Groundwater abstraction; Groundwater flow
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APA (6th Edition):
Van Ballaer, A. (. (2020). Monitoring Groundwater flow with ERT. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:68835460-920e-4799-8f44-39d6dbf74d36
Chicago Manual of Style (16th Edition):
Van Ballaer, A (author). “Monitoring Groundwater flow with ERT.” 2020. Masters Thesis, Delft University of Technology. Accessed February 27, 2021.
http://resolver.tudelft.nl/uuid:68835460-920e-4799-8f44-39d6dbf74d36.
MLA Handbook (7th Edition):
Van Ballaer, A (author). “Monitoring Groundwater flow with ERT.” 2020. Web. 27 Feb 2021.
Vancouver:
Van Ballaer A(. Monitoring Groundwater flow with ERT. [Internet] [Masters thesis]. Delft University of Technology; 2020. [cited 2021 Feb 27].
Available from: http://resolver.tudelft.nl/uuid:68835460-920e-4799-8f44-39d6dbf74d36.
Council of Science Editors:
Van Ballaer A(. Monitoring Groundwater flow with ERT. [Masters Thesis]. Delft University of Technology; 2020. Available from: http://resolver.tudelft.nl/uuid:68835460-920e-4799-8f44-39d6dbf74d36
University of Aberdeen
3.
McGrane, Scott James.
The hydrology of mesoscale catchments in Scotland : hydroclimatic trends, monitoring and modelling isotope dynamics and water quality implications.
Degree: PhD, 2012, University of Aberdeen
URL: https://abdn.alma.exlibrisgroup.com/view/delivery/44ABE_INST/12152480780005941
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.575387
► Understanding the spatial and temporal dynamics of catchment systems is crucial to understanding how hydrological behaviour may change over time and how this impacts on…
(more)
▼ Understanding the spatial and temporal dynamics of catchment systems is crucial to understanding how hydrological behaviour may change over time and how this impacts on crucial aspects of catchment management such as flood generation, water resource management and the sources and fluxes of sediment, nutrients and contaminants. A combined statistical analysis was undertaken to assess whether similar catchment groupings respond to changing climatic drivers in the same way. A k-means cluster and PCA analysis grouped catchments in four clusters, which were differentiated by their topographical differences between lowland and upland catchments. Lowland catchments exhibited similar behaviours to changing trends of key hydroclimatic variables whereas more upland catchments showed diverse responses. We assessed the behaviour of 8 mesoscale catchments with increasing lowland areas for spatial and temporal runoff dynamics via the application of environmental tracers (stable isotopes and Gran alkalinity). Mean transit times were estimated using a lumped convolution integral model and lowland catchments with greater coverage of sedimentary bedrock exhibited longer turnover for water and solute fluxes. Tracer data was then implemented into a conceptual rainfall-runoff model to develop a model, which could represent both spatial and temporal dynamics rather than simply recreating the observed stream hydrograph. Finally, we assessed the role of dominant landscape characteristics (urban environments and grazing pastures) on the sources and fluxes of microbial contaminant risk to water quality. Catchments which had larger urban coverage and higher portion of grazing pastures yielded higher concentration fluxes of faecal coliforms which provided a first-order approximation of water quality risk at the catchment scale.
Subjects/Keywords: 550; Groundwater analysis; Groundwater flow; Water quality
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APA (6th Edition):
McGrane, S. J. (2012). The hydrology of mesoscale catchments in Scotland : hydroclimatic trends, monitoring and modelling isotope dynamics and water quality implications. (Doctoral Dissertation). University of Aberdeen. Retrieved from https://abdn.alma.exlibrisgroup.com/view/delivery/44ABE_INST/12152480780005941 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.575387
Chicago Manual of Style (16th Edition):
McGrane, Scott James. “The hydrology of mesoscale catchments in Scotland : hydroclimatic trends, monitoring and modelling isotope dynamics and water quality implications.” 2012. Doctoral Dissertation, University of Aberdeen. Accessed February 27, 2021.
https://abdn.alma.exlibrisgroup.com/view/delivery/44ABE_INST/12152480780005941 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.575387.
MLA Handbook (7th Edition):
McGrane, Scott James. “The hydrology of mesoscale catchments in Scotland : hydroclimatic trends, monitoring and modelling isotope dynamics and water quality implications.” 2012. Web. 27 Feb 2021.
Vancouver:
McGrane SJ. The hydrology of mesoscale catchments in Scotland : hydroclimatic trends, monitoring and modelling isotope dynamics and water quality implications. [Internet] [Doctoral dissertation]. University of Aberdeen; 2012. [cited 2021 Feb 27].
Available from: https://abdn.alma.exlibrisgroup.com/view/delivery/44ABE_INST/12152480780005941 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.575387.
Council of Science Editors:
McGrane SJ. The hydrology of mesoscale catchments in Scotland : hydroclimatic trends, monitoring and modelling isotope dynamics and water quality implications. [Doctoral Dissertation]. University of Aberdeen; 2012. Available from: https://abdn.alma.exlibrisgroup.com/view/delivery/44ABE_INST/12152480780005941 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.575387
Oregon State University
4.
Osathaphan, Khemarath.
Multi-metal equilibrium sorption and transport modeling for copper, chromium, and arsenic in an iron oxide-coated sand, synthetic groundwater system.
Degree: PhD, Civil Engineering, 2001, Oregon State University
URL: http://hdl.handle.net/1957/32443
► The mixed metal compound, Chromated Copper Arsenate, or CCA, has been widely used as a wood preservative. The metal ions in CCA, CrO²⁻₄, Cu²⁺, and…
(more)
▼ The mixed metal compound, Chromated Copper Arsenate, or CCA, has
been widely used as a wood preservative. The metal ions in CCA,
CrO²⁻₄, Cu²⁺, and AsO³⁻₄, have been found in contaminated surface and subsurface
soils and
groundwater nearby some wood preservative facilities and nearby wood
structures. Iron oxides are a ubiquitous soil-coating constituent and are believed to
be a main factor in controlling the transport and fate of many metals in the soil
solution. In this research, iron-oxide-coated sand (IOCS) is used as a surrogate soil
to investigate the adsorption and transport behavior of the mixed metals solution,
copper, chromate, and arsenate, in the subsurface environment.
Copper adsorption increases with increasing pH. The presence of arsenate
in the solution slightly increases, while chromate has minimal effect, on the amount
of copper adsorbed. Chromate adsorption decreases with increasing pH. With
arsenate present in solution, chromate adsorption is significantly suppressed over
the pH range studied. In contrast, the presence of copper slightly increases
chromate adsorption. Similar to chromate, arsenate adsorption decreases with
increasing pH. The presence of chromate or copper does not affect the amount of
arsenate adsorbed over the range of concentrations studied.
Two surface complexation models, the triple layer model (TLM) and the
electrostatic implicit model (EIM), were used to simulate equilibrium adsorption in
both single-metal and multi-metal systems. Simulations using the specific surface
complexation equilibrium constants derived from either the single-metal or the
multi-metal systems with both the TLM and the EIM were successful in fitting the
adsorption data in that respective single or multi-metal system.
The local equilibrium assumption using batch-derived sorption isotherm
parameters from the EIM failed to predict the copper and arsenate transport, while
it adequately described chromate transport. The breakthrough curves of all three
metals were asymmetrical and showed long-tailing behavior. This nonideal
behavior is caused by nonlinear sorption and/or non-equilibrium conditions during
transport. The two-site chemical non-equilibrium model, which accounts for the
kinetically controlled adsorption sites, was able to fit the observed breakthrough
curves for all three metals in single-metal systems. However, the model was
partially successful in predicting transport in multi-metal systems.
Advisors/Committee Members: Nelson, Peter O. (advisor), Kong, Wei (committee member).
Subjects/Keywords: Groundwater flow
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APA (6th Edition):
Osathaphan, K. (2001). Multi-metal equilibrium sorption and transport modeling for copper, chromium, and arsenic in an iron oxide-coated sand, synthetic groundwater system. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/32443
Chicago Manual of Style (16th Edition):
Osathaphan, Khemarath. “Multi-metal equilibrium sorption and transport modeling for copper, chromium, and arsenic in an iron oxide-coated sand, synthetic groundwater system.” 2001. Doctoral Dissertation, Oregon State University. Accessed February 27, 2021.
http://hdl.handle.net/1957/32443.
MLA Handbook (7th Edition):
Osathaphan, Khemarath. “Multi-metal equilibrium sorption and transport modeling for copper, chromium, and arsenic in an iron oxide-coated sand, synthetic groundwater system.” 2001. Web. 27 Feb 2021.
Vancouver:
Osathaphan K. Multi-metal equilibrium sorption and transport modeling for copper, chromium, and arsenic in an iron oxide-coated sand, synthetic groundwater system. [Internet] [Doctoral dissertation]. Oregon State University; 2001. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1957/32443.
Council of Science Editors:
Osathaphan K. Multi-metal equilibrium sorption and transport modeling for copper, chromium, and arsenic in an iron oxide-coated sand, synthetic groundwater system. [Doctoral Dissertation]. Oregon State University; 2001. Available from: http://hdl.handle.net/1957/32443
Stellenbosch University
5.
Stander, McLachlan Du Toit.
An investigation into the influence of soil pattern on preferential flow and groundwater recharge in fractured bedrock and cover sand aquifers.
Degree: MScAgric, Soil Science, 2011, Stellenbosch University
URL: http://hdl.handle.net/10019.1/18089
► ENGLISH ABSTRACT: Increased pressure on groundwater sources due to increased population size and threats of climate change is driving research to better understand the process…
(more)
▼ ENGLISH ABSTRACT: Increased pressure on
groundwater sources due to increased population size and threats of climate change is driving research to better understand the process of aquifer recharge. Soil pattern is of interest as it serves to partition rainwater into different flowpaths destined for surface runoff, evapotranspiration and deep percolation. The challenges inherent to studying these flowpaths are almost universal as uncertainties concerning spatial and temporal heterogeneity in catchments make the upscaling of models complex.
This research addresses these challenges as it aims to improve the catchment scale hydrological models of two aquifer systems: One a fractured bedrock system at the Kogelberg Nature Reserve, Kleinmond, and the other a cover sand system in Riverlands Nature Reserve, Malmesbury. This study focussed on strengthening the link between what is known about a given soil form and the hydrological assumptions that can be drawn from that classification, and formulating the results so that they may ultimately be used to calibrate the recharge prediction models for the respective catchments.
The research was done in two parts: The first phase was to conduct soil surveys in both reserves during which soils were classified according to South African Soil Classification. Samples were collected at representative observation points which provided textural data for use in pedotransfer functions (PTFs). These PTFs were used to estimate plant available water (PAW) and hydraulic conductivity (K) for the observed profiles. Infiltration experiments were subsequently done to investigate the infiltration patterns of distinctly different soil forms at two sites from each reserve. The experiments included double ring and mini disc infiltration, volumetric water content determination and
flow path visualisation using a staining dye.
A statistical comparison between the hydrological properties (K and PAW) of the different soil forms suggest that hydraulic properties differed between the deep sandy soil forms (Fernwood, Pinegrove and Witfontein in Kogelberg and Witfontein, Concordia and Lamotte in Riverlands) and the shallow rocky soil forms (Cartref and Glenrosa in Kogelberg). Thus grouping of hydrological similar units (HSUs) could be done on the basis of the soil forms present within the given catchments.
The infiltration study showed that shallow, rocky soils that grade into bedrock would have infiltration rates far greater than those estimated using PTFs in Kogelberg. This is due to the prevalence of continuous preferential
flow (PF) of water between coarse fragments in these profiles. Recharge estimates would thus be inaccurate in such soils and calibration using locally derived data is recommended.
On the contrary, PTFs produced accurate infiltration estimates relative to measured infiltration rates in deep sandy soils in Kogelberg and Riverlands. The Lamotte soil form is an example of such a soil form. It should however be noted that an increase in PF in these soils had subsequently higher K values…
Advisors/Committee Members: Rozanov, Andrei, Jovanovic, N., Ellis, F., Stellenbosch University. Faculty of AgriSciences. Dept. of Soil Science..
Subjects/Keywords: Soil science; Groundwater flow
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APA ·
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APA (6th Edition):
Stander, M. D. T. (2011). An investigation into the influence of soil pattern on preferential flow and groundwater recharge in fractured bedrock and cover sand aquifers. (Masters Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/18089
Chicago Manual of Style (16th Edition):
Stander, McLachlan Du Toit. “An investigation into the influence of soil pattern on preferential flow and groundwater recharge in fractured bedrock and cover sand aquifers.” 2011. Masters Thesis, Stellenbosch University. Accessed February 27, 2021.
http://hdl.handle.net/10019.1/18089.
MLA Handbook (7th Edition):
Stander, McLachlan Du Toit. “An investigation into the influence of soil pattern on preferential flow and groundwater recharge in fractured bedrock and cover sand aquifers.” 2011. Web. 27 Feb 2021.
Vancouver:
Stander MDT. An investigation into the influence of soil pattern on preferential flow and groundwater recharge in fractured bedrock and cover sand aquifers. [Internet] [Masters thesis]. Stellenbosch University; 2011. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10019.1/18089.
Council of Science Editors:
Stander MDT. An investigation into the influence of soil pattern on preferential flow and groundwater recharge in fractured bedrock and cover sand aquifers. [Masters Thesis]. Stellenbosch University; 2011. Available from: http://hdl.handle.net/10019.1/18089
6.
Pirot, Guillaume.
Stochastic heterogeneity modeling of braided river aquifers:
a methodology based on multiple point statistics and analog
data.
Degree: 2015, Université de Neuchâtel
URL: http://doc.rero.ch/record/234460
► In this thesis a new pseudo-genetic method to model the heterogeneity of sandy gravel braided-river aquifers is proposed. It is tested and compared with other…
(more)
▼ In this thesis a new pseudo-genetic method to model
the heterogeneity of sandy gravel braided-river aquifers is
proposed. It is tested and compared with other modeling approaches
on a case study of contaminant transport. Indeed, in Switzerland or
in mountainous regions, braided-river aquifers represent an
important water resource that need to be preserved. In order to
manage this resource, a good understanding of
groundwater flow and
transport in braided-river aquifers is necessary. As the complex
heterogeneity of such sedimentary deposits strongly influences the
groundwater flow and transport,
groundwater behavior predictions
need to rely on a wide spectrum of geological model realizations.
To achieve realistic sedimentary deposits modeling of
braided river aquifers, the proposed pseudo-genetic algorithm
combines the use of analogue data with Multiple-Point Statistics
and process-imitating methods. The integration of analogue data is
a key feature to provide additional, complementary and necessary
information in the modeling process. Assuredly, hydrogeologist are
often
subject to field data scarcity because of budget, time and
field constraints. Multiple-Points Statistics recent algorithms, on
one hand, allow to produce realistic stochastic realizations from
training set with complex structures and at the same time allow to
honor easily conditioning data. On the other hand,
process-imitating methods allow to generate realistic patterns by
mimicking physical processes. The proposed
pseudo-genetic algorithm consists of two main steps. The first step
is to build main geological units by stacking successive topography
realizations one above the other. So, it mimics the successive
large flood events contributing to the formation of the sedimentary
deposits. The successive topographies are Multiple-Point Statistics
realizations from a training set composed of Digital Elevation
Models of an analogue braided-river at different time steps. Each
topography is generated conditionally to the previous one. The
second step is to generate fine scale heterogeneity within the main
geological units. This is performed for each geological unit by
iterative deformations of the unit bottom surface, imitating so the
process of scour filling. With three main parameters, the
aggradation rate, the number of successive iterations and the
intensity of the deformations, the algorithm allows to produce a
wide range of realistic cross-stratified sedimentary deposits.
The method is tested in a contaminant transport example,
using as reference Tritium tracer experiment concentration data
from MADE site, Columbus, Mississippi, USA. In this test case, an
assumption of data scarcity is made. Analogue data are integrated
in the geological modeling process to determine the input
parameters required – characteristic dimensions and conductivity
statistical properties – for two variants of the proposed
pseudo-genetic algorithm as well as for multi-gaussian simulation
and object based methods. For each conceptual model,
flow and
transport…
Advisors/Committee Members: Philippe (Dir.), Julien (Codir.).
Subjects/Keywords: groundwater flow and transport simulation
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APA ·
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Manager
APA (6th Edition):
Pirot, G. (2015). Stochastic heterogeneity modeling of braided river aquifers:
a methodology based on multiple point statistics and analog
data. (Thesis). Université de Neuchâtel. Retrieved from http://doc.rero.ch/record/234460
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):
Pirot, Guillaume. “Stochastic heterogeneity modeling of braided river aquifers:
a methodology based on multiple point statistics and analog
data.” 2015. Thesis, Université de Neuchâtel. Accessed February 27, 2021.
http://doc.rero.ch/record/234460.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Pirot, Guillaume. “Stochastic heterogeneity modeling of braided river aquifers:
a methodology based on multiple point statistics and analog
data.” 2015. Web. 27 Feb 2021.
Vancouver:
Pirot G. Stochastic heterogeneity modeling of braided river aquifers:
a methodology based on multiple point statistics and analog
data. [Internet] [Thesis]. Université de Neuchâtel; 2015. [cited 2021 Feb 27].
Available from: http://doc.rero.ch/record/234460.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Pirot G. Stochastic heterogeneity modeling of braided river aquifers:
a methodology based on multiple point statistics and analog
data. [Thesis]. Université de Neuchâtel; 2015. Available from: http://doc.rero.ch/record/234460
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Hong Kong
7.
Chow, Ho-yin, Paul.
Prediction of fluctuation
in groundwater flow regime at the pos selim landslide in response
to rainfall using a numerical modellingapproach.
Degree: 2008, University of Hong Kong
URL: http://hdl.handle.net/10722/50168
Subjects/Keywords: Groundwater flow.
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Manager
APA (6th Edition):
Chow, Ho-yin, P. (2008). Prediction of fluctuation
in groundwater flow regime at the pos selim landslide in response
to rainfall using a numerical modellingapproach. (Thesis). University of Hong Kong. Retrieved from http://hdl.handle.net/10722/50168
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):
Chow, Ho-yin, Paul. “Prediction of fluctuation
in groundwater flow regime at the pos selim landslide in response
to rainfall using a numerical modellingapproach.” 2008. Thesis, University of Hong Kong. Accessed February 27, 2021.
http://hdl.handle.net/10722/50168.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Chow, Ho-yin, Paul. “Prediction of fluctuation
in groundwater flow regime at the pos selim landslide in response
to rainfall using a numerical modellingapproach.” 2008. Web. 27 Feb 2021.
Vancouver:
Chow, Ho-yin P. Prediction of fluctuation
in groundwater flow regime at the pos selim landslide in response
to rainfall using a numerical modellingapproach. [Internet] [Thesis]. University of Hong Kong; 2008. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10722/50168.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Chow, Ho-yin P. Prediction of fluctuation
in groundwater flow regime at the pos selim landslide in response
to rainfall using a numerical modellingapproach. [Thesis]. University of Hong Kong; 2008. Available from: http://hdl.handle.net/10722/50168
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of British Columbia
8.
Cahn, Lorie Selma.
Development of guidelines for design of sampling programs to predict groundwater discharge.
Degree: MS- MSc, Geological Sciences, 1987, University of British Columbia
URL: http://hdl.handle.net/2429/26178
► The objective of this study is to develop guidelines for the design of sampling programs to predict groundwater discharge. A method for choosing a preferred…
(more)
▼ The objective of this study is to develop guidelines for the design of sampling programs to predict groundwater discharge. A method for choosing a preferred sampling strategy from a set of alternatives is presented. A framework is outlined, in the form of an objective function, that incorporates both the cost of collecting data and the worth of data. A monetary value is assigned to the worth of hydraulic conductivity data by examining the economic losses associated with the uncertainty in predictions of groundwater discharge. The method is applied to the problem of designing a sampling program that measures hydraulic conductivity for predicting discharge from a rapid infiltration pond.
Hydraulic conductivity data are generated for hypothetical hill slopes using a stochastic finite element model. A set of sampling strategies are selected. For each sampling strategy, the value and location of measurements and the uncertainty in the spatial variation of hydraulic conductivity are incorporated using conditional simulations. Estimates of pond discharge are calculated from the stream function solution and compared to the actual value of pond discharge for the hypothetical site. The root mean square error is used to quantify the uncertainty in discharge predictions. A set of alternative sampling strategies are compared using the objective function.
Prediction uncertainty, measured by the root mean square error, is sensitive to both the structure of the heterogeneities and the location of measurements. Sampling schemes that lead to good estimates of the ensemble mean and standard deviation will not necessarily lead to good predictions of discharge. The goal of sampling schemes should be to collect data in key locations of the flow domain and to identify the spatial variation in hydraulic conductivity in a cost effective manner. For predicting discharge from a rapid infiltration pond, locating one or two initial boreholes below the pond is the preferred strategy for a majority of the cases tested. When the measurements are spaced evenly throughout the flow domain, important shallow layers may be missed that have a large influence on pond discharge. Increasing the number of boreholes does not necessarily lead to more certain predictions of pond discharge or to lower values of the objective function. Considerable uncertainty in discharge predictions can exist even with a relatively large number of measurements. While an optimal strategy exists, there is potential for significant variation in prediction uncertainty at individual sites.
Subjects/Keywords: Groundwater flow
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APA (6th Edition):
Cahn, L. S. (1987). Development of guidelines for design of sampling programs to predict groundwater discharge. (Masters Thesis). University of British Columbia. Retrieved from http://hdl.handle.net/2429/26178
Chicago Manual of Style (16th Edition):
Cahn, Lorie Selma. “Development of guidelines for design of sampling programs to predict groundwater discharge.” 1987. Masters Thesis, University of British Columbia. Accessed February 27, 2021.
http://hdl.handle.net/2429/26178.
MLA Handbook (7th Edition):
Cahn, Lorie Selma. “Development of guidelines for design of sampling programs to predict groundwater discharge.” 1987. Web. 27 Feb 2021.
Vancouver:
Cahn LS. Development of guidelines for design of sampling programs to predict groundwater discharge. [Internet] [Masters thesis]. University of British Columbia; 1987. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/2429/26178.
Council of Science Editors:
Cahn LS. Development of guidelines for design of sampling programs to predict groundwater discharge. [Masters Thesis]. University of British Columbia; 1987. Available from: http://hdl.handle.net/2429/26178
Ryerson University
9.
Abbasi, Mubashar.
Simulation of fate & transport of contaminants in groundwater for supporting site assessment.
Degree: 2010, Ryerson University
URL: https://digital.library.ryerson.ca/islandora/object/RULA%3A6372
► Computer simulations have become a useful part of mathematical modeling of many natural systems in science and engineering. Simulations can be used to explore and…
(more)
▼ Computer simulations have become a useful part of mathematical modeling of many natural systems in science and engineering. Simulations can be used to explore and gain new insights into new technology, and to estimate the performance of systems too complex for analytical solutions. BIOPLUME III is a numerical two-dimensional model that tracks the fate and transport of aromatic hydrocarbons. To help the environmental professional with the data management, visualization, and decision making tasks involved. Interpretations based on model analyses must recognize the significance of uncertainties in input data. Models of ground-water systems should be regarded as just one tool among many that can be used in the analysis of a ground-water quality problem. Numerical simulation can help the analyst integrate available data, evaluate conceptual models, test hypotheses pertaining to flow and quality changes, and predict system responses to alternative stresses. The models do not replace field data, but they help to guide the design of a more effective and more efficient data-collection program.
Subjects/Keywords: Groundwater – Pollution – Computer simulation; Groundwater – Pollution – Mathematical models; Groundwater – Pollution – Data processing; Groundwater flow – Computer simulation; Groundwater flow – Data processing; Groundwater flow – Mathematical models; Groundwater – Quality – Management
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APA (6th Edition):
Abbasi, M. (2010). Simulation of fate & transport of contaminants in groundwater for supporting site assessment. (Thesis). Ryerson University. Retrieved from https://digital.library.ryerson.ca/islandora/object/RULA%3A6372
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):
Abbasi, Mubashar. “Simulation of fate & transport of contaminants in groundwater for supporting site assessment.” 2010. Thesis, Ryerson University. Accessed February 27, 2021.
https://digital.library.ryerson.ca/islandora/object/RULA%3A6372.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Abbasi, Mubashar. “Simulation of fate & transport of contaminants in groundwater for supporting site assessment.” 2010. Web. 27 Feb 2021.
Vancouver:
Abbasi M. Simulation of fate & transport of contaminants in groundwater for supporting site assessment. [Internet] [Thesis]. Ryerson University; 2010. [cited 2021 Feb 27].
Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A6372.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Abbasi M. Simulation of fate & transport of contaminants in groundwater for supporting site assessment. [Thesis]. Ryerson University; 2010. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A6372
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Texas – Austin
10.
Chan, Wai Sum, 1984-.
Investigation on heat transport in hyporheic zone using flume simulation and modeling.
Degree: MA, Science Education, 2011, University of Texas – Austin
URL: http://hdl.handle.net/2152/ETD-UT-2011-08-3885
► Recent research has shown that groundwater flow in hyporheic zone is critical in major hydrologic, ecological, and biogeochemical processes. Quantitative analyses from the literature show…
(more)
▼ Recent research has shown that
groundwater flow in hyporheic zone is critical in major hydrologic, ecological, and biogeochemical processes. Quantitative analyses from the literature show that there is a strong correlation between the diel cycles in pH, water temperature, and other parameters such as trace metal concentrations. There is, however, no controlled experimental data to illustrate how water temperature influences the trace metal concentrations and other parameters. The research study presented here illustrates the mechanism of heat is transported from stream water to
groundwater in the hyporheic zone on different bed form. The work will serve as the foundation of future research in understanding the relationship of heat and trace metal concentrations in the sediments.
Advisors/Committee Members: Cardenas, Meinhard Bayani, 1977- (advisor), Wilson, Clark R. (committee member).
Subjects/Keywords: Hyporheic zone; Hyporheic groundwater; Diel cycles; Heat transport; Heat exchange; Groundwater; Groundwater flow
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APA (6th Edition):
Chan, Wai Sum, 1. (2011). Investigation on heat transport in hyporheic zone using flume simulation and modeling. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2011-08-3885
Chicago Manual of Style (16th Edition):
Chan, Wai Sum, 1984-. “Investigation on heat transport in hyporheic zone using flume simulation and modeling.” 2011. Masters Thesis, University of Texas – Austin. Accessed February 27, 2021.
http://hdl.handle.net/2152/ETD-UT-2011-08-3885.
MLA Handbook (7th Edition):
Chan, Wai Sum, 1984-. “Investigation on heat transport in hyporheic zone using flume simulation and modeling.” 2011. Web. 27 Feb 2021.
Vancouver:
Chan, Wai Sum 1. Investigation on heat transport in hyporheic zone using flume simulation and modeling. [Internet] [Masters thesis]. University of Texas – Austin; 2011. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/2152/ETD-UT-2011-08-3885.
Council of Science Editors:
Chan, Wai Sum 1. Investigation on heat transport in hyporheic zone using flume simulation and modeling. [Masters Thesis]. University of Texas – Austin; 2011. Available from: http://hdl.handle.net/2152/ETD-UT-2011-08-3885
11.
McCarthy, Kathleen Ann.
The transport of volatile compounds across the capillary fringe.
Degree: PhD, 1992, Oregon Health Sciences University
URL: doi:10.6083/M4WS8R6N
;
http://digitalcommons.ohsu.edu/etd/287
Subjects/Keywords: Groundwater; Groundwater flow; Mass transfer
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APA (6th Edition):
McCarthy, K. A. (1992). The transport of volatile compounds across the capillary fringe. (Doctoral Dissertation). Oregon Health Sciences University. Retrieved from doi:10.6083/M4WS8R6N ; http://digitalcommons.ohsu.edu/etd/287
Chicago Manual of Style (16th Edition):
McCarthy, Kathleen Ann. “The transport of volatile compounds across the capillary fringe.” 1992. Doctoral Dissertation, Oregon Health Sciences University. Accessed February 27, 2021.
doi:10.6083/M4WS8R6N ; http://digitalcommons.ohsu.edu/etd/287.
MLA Handbook (7th Edition):
McCarthy, Kathleen Ann. “The transport of volatile compounds across the capillary fringe.” 1992. Web. 27 Feb 2021.
Vancouver:
McCarthy KA. The transport of volatile compounds across the capillary fringe. [Internet] [Doctoral dissertation]. Oregon Health Sciences University; 1992. [cited 2021 Feb 27].
Available from: doi:10.6083/M4WS8R6N ; http://digitalcommons.ohsu.edu/etd/287.
Council of Science Editors:
McCarthy KA. The transport of volatile compounds across the capillary fringe. [Doctoral Dissertation]. Oregon Health Sciences University; 1992. Available from: doi:10.6083/M4WS8R6N ; http://digitalcommons.ohsu.edu/etd/287
University of Arizona
12.
Roberts, Mary Elizabeth, 1959-.
The use of fluorocarbon tracers to monitor the movement of water in unsaturated porous media : column study and computer model
.
Degree: 1986, University of Arizona
URL: http://hdl.handle.net/10150/191902
► A major problem associated with monitoring the velocity of water in unsaturated porous media is the difficulty of removing samples of the pore water at…
(more)
▼ A major problem associated with monitoring the velocity of water in unsaturated porous media is the difficulty of removing samples of the pore water at different times for analysis. A possible solution to this problem is to use volatile fluorocarbon tracers which are transported in a soluble form, yet can be measured in a gaseous state, thus eliminating the difficult process of extracting liquid samples from soils with high matric suction. The three fluorocarbon tracers used to investigate the suitability of a volatile tracer method were bromochlorodifluoromethane, chlorodifluoroethane and sulfur hexafluoride. Five laboratory column experiments were conducted to determine under what conditions volatile tracers would give reliable estimates of water flow rates. The Discrete State Compartment computer model was used to interpret the laboratory data, thereby allowing a more accurate estimate of water travel times in unsaturated media.
Subjects/Keywords: Hydrology.;
Groundwater flow.;
Groundwater tracers.
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APA (6th Edition):
Roberts, Mary Elizabeth, 1. (1986). The use of fluorocarbon tracers to monitor the movement of water in unsaturated porous media : column study and computer model
. (Masters Thesis). University of Arizona. Retrieved from http://hdl.handle.net/10150/191902
Chicago Manual of Style (16th Edition):
Roberts, Mary Elizabeth, 1959-. “The use of fluorocarbon tracers to monitor the movement of water in unsaturated porous media : column study and computer model
.” 1986. Masters Thesis, University of Arizona. Accessed February 27, 2021.
http://hdl.handle.net/10150/191902.
MLA Handbook (7th Edition):
Roberts, Mary Elizabeth, 1959-. “The use of fluorocarbon tracers to monitor the movement of water in unsaturated porous media : column study and computer model
.” 1986. Web. 27 Feb 2021.
Vancouver:
Roberts, Mary Elizabeth 1. The use of fluorocarbon tracers to monitor the movement of water in unsaturated porous media : column study and computer model
. [Internet] [Masters thesis]. University of Arizona; 1986. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10150/191902.
Council of Science Editors:
Roberts, Mary Elizabeth 1. The use of fluorocarbon tracers to monitor the movement of water in unsaturated porous media : column study and computer model
. [Masters Thesis]. University of Arizona; 1986. Available from: http://hdl.handle.net/10150/191902
University of Waikato
13.
Shokri, Ali.
Developing groundwater and surface water interaction methods for complex hydrological systems
.
Degree: 2016, University of Waikato
URL: http://hdl.handle.net/10289/10689
► Methods and models associated with the interaction of surface-subsurface water flow have been widely employed in many environmental studies over the last decade. However, in…
(more)
▼ Methods and models associated with the interaction of surface-subsurface water
flow have been widely employed in many environmental studies over the last decade. However, in spite of considerable effort, understanding the impact of both artificial and natural aspects of the connection between surface water and
groundwater systems still remains a challenge for
groundwater and surface water models.
In this doctoral study, two types of complex and integrated problems are identified as knowledge gaps in coupled surface and subsurface
flow studies (i) interaction situations that arise from use of artificial drains in agricultural catchments, and (ii) complex
flow situations that sometimes arise as a result of a combination of near surface aquifers which are both perched and leaky. The specific objectives of this research project were (1) to improve classical tile drain spacing design methods; and (2) via a case study, to assess the role of semi-impermeable layers influencing the interaction between surface water and a regional
groundwater system.
To meet the first objective the DrainFlow code is developed. DrainFlow is a new, fully distributed, physically based and integrated surface-subsurface
flow code that is designed for water movement in tile/mole drains, open drains, and saturated/unsaturated zones. DrainFlow, applied to examples of drainage studies, is found to be quite flexible in terms of changing all or part of the model dimensions as required by problem complexity, scale, and data availability. This flexibility gives DrainFlow the capacity to be modified to meet the specific requirements of varying scale and boundary conditions as often encountered in drainage projects.
In addition, the classical well-known Hooghoudt drain spacing equation is modified. It is shown via comparison with numerical models that the Hooghoudt equation can overestimate water table height and therefore yield drain spacings which may be too wide. The modified expression yields improved accuracy as measured against the numerical reference model.
To meet the second objective, the effect of a thin semi-impermeable and fractured layer between two relatively permeable volcanic formations is investigated in an industrial catchment system at Kawerau, New Zealand. It is concluded that subtle near-surface geological features may have a critical role on controlling the volume and pattern of the
flow exchange between the surface, subsurface
flow and regional
groundwater systems.
This doctoral thesis overcomes some weaknesses of isolated surface and subsurface
flow models and some constructive and practical approaches are developed to enhance the previous methods.
Advisors/Committee Members: Bardsley, W. Earl (advisor), Pittari, Adrian (advisor).
Subjects/Keywords: DrainFlow;
Groundwater;
interaction surface subsurface flow;
coupled surface water groundwater;
Hydrology
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APA (6th Edition):
Shokri, A. (2016). Developing groundwater and surface water interaction methods for complex hydrological systems
. (Doctoral Dissertation). University of Waikato. Retrieved from http://hdl.handle.net/10289/10689
Chicago Manual of Style (16th Edition):
Shokri, Ali. “Developing groundwater and surface water interaction methods for complex hydrological systems
.” 2016. Doctoral Dissertation, University of Waikato. Accessed February 27, 2021.
http://hdl.handle.net/10289/10689.
MLA Handbook (7th Edition):
Shokri, Ali. “Developing groundwater and surface water interaction methods for complex hydrological systems
.” 2016. Web. 27 Feb 2021.
Vancouver:
Shokri A. Developing groundwater and surface water interaction methods for complex hydrological systems
. [Internet] [Doctoral dissertation]. University of Waikato; 2016. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10289/10689.
Council of Science Editors:
Shokri A. Developing groundwater and surface water interaction methods for complex hydrological systems
. [Doctoral Dissertation]. University of Waikato; 2016. Available from: http://hdl.handle.net/10289/10689
University of Arizona
14.
Hargis, David Robert.
Analysis of factors affecting water level recovery data
.
Degree: 1979, University of Arizona
URL: http://hdl.handle.net/10150/191053
► Water level recovery data collected in wells following controlled pumping tests are affected by both borehole and formation factors. The borehole factors comprise those effects…
(more)
▼ Water level recovery data collected in wells following controlled pumping tests are affected by both borehole and formation factors. The borehole factors comprise those effects attributed to the presence of the wellbore, such as step-increases in pumping rate, wellbore storage, well efficiency, and skin effects. The formation factors comprise those effects associated with the geologic environment in which an aquifer system occurs, such as variation of the coefficient of storage, and aquifer barrier boundaries. The recovery data should plot as a straight line on a semilogarithmic plot. Step-increases in the discharge rate during the pumping period cause the water level recovery plot to be concave downward. The curvature of the recovery data plot can be eliminated by applying a correction proposed by Harrill in 1970. However, the effect of step-increases in pumping rate on the recovery data is minimal so long as the duration of the pumping steps is less than about one-third of the total duration of pumping. The well efficiency and skin effects cause an additional component of drawdown in a pumped well, which is manifested as an initially rapid recovery rate after pumping stops. The effects of skin and well efficiency are usually dissipated within a few minutes after pumping stops. Wellbore storage effects can be critical in large diameter wells (wellbore radius greater than 0.5 feet) that penetrate aquifers with transmissivities less than about 2,700 feet squared per day. The time required to dissipate wellbore storage effects in the water level recovery data is inversely proportional to the aquifer transmissivity, and directly proportional to the borehole size. Variation of the coefficient of storage during the recovery period results in a semi-logarithmic recovery plot that is concave downward. The curvature of the recovery plot increases as the variation of the coefficient of storage increases. Variation in the coefficient of storage of one order of magnitude during the recovery period introduces an error of more than fifty percent in the transmissivity calculation at late recovery times. The recovery plot of data collected in a well influenced by a barrier boundary defines two straight line segments. The early-time straight line segment has a slope one-half that of the late-time straight line segment. Analysis of the early-time straight line yields the true aquifer transmissivity. Analysis and interpretation of water level recovery data collected in 59 wells following controlled pumping tests in aquifers of various rock types indicate that, in general, the shape of the recovery plot can be used to diagnose the presence of skin effects, low well efficiency, wellbore storage, and variation of the coefficient of storage. Analysis of data from seventeen wells in alluvial aquifers and thirteen wells in sandstone aquifers indicates that the concave downward recovery plot is the most common type of response curve. This shape of recovery curve indicates that the coefficient of storage is commonly smaller during the…
Advisors/Committee Members: Simpson, Eugene S. (committeemember), Ince, Simon (committeemember), Bull, William B. (committeemember).
Subjects/Keywords: Hydrology.;
Groundwater.;
Groundwater flow.;
Wells.
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APA (6th Edition):
Hargis, D. R. (1979). Analysis of factors affecting water level recovery data
. (Doctoral Dissertation). University of Arizona. Retrieved from http://hdl.handle.net/10150/191053
Chicago Manual of Style (16th Edition):
Hargis, David Robert. “Analysis of factors affecting water level recovery data
.” 1979. Doctoral Dissertation, University of Arizona. Accessed February 27, 2021.
http://hdl.handle.net/10150/191053.
MLA Handbook (7th Edition):
Hargis, David Robert. “Analysis of factors affecting water level recovery data
.” 1979. Web. 27 Feb 2021.
Vancouver:
Hargis DR. Analysis of factors affecting water level recovery data
. [Internet] [Doctoral dissertation]. University of Arizona; 1979. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10150/191053.
Council of Science Editors:
Hargis DR. Analysis of factors affecting water level recovery data
. [Doctoral Dissertation]. University of Arizona; 1979. Available from: http://hdl.handle.net/10150/191053
15.
Versluys, J.
De capillaire werkingen in den bodem.
Degree: 1916, W. Versluys, Amsterdam
URL: http://resolver.tudelft.nl/uuid:b11259b6-dc12-4c01-b409-2b8d9f0408a2
;
urn:NBN:nl:ui:24-uuid:b11259b6-dc12-4c01-b409-2b8d9f0408a2
;
urn:NBN:nl:ui:24-uuid:b11259b6-dc12-4c01-b409-2b8d9f0408a2
;
http://resolver.tudelft.nl/uuid:b11259b6-dc12-4c01-b409-2b8d9f0408a2
Beschouwing over de capillaiewerking van grondwater en waar dit een functie van is. Beschrijving funiculair en pendulair water. Uitwisseling van water en lucht in de bodem
Advisors/Committee Members: De Haas, W.J..Subjects/Keywords: groundwater flow; groundwater; phreatic line
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APA (6th Edition):
Versluys, J. (1916). De capillaire werkingen in den bodem. (Doctoral Dissertation). W. Versluys, Amsterdam. Retrieved from http://resolver.tudelft.nl/uuid:b11259b6-dc12-4c01-b409-2b8d9f0408a2 ; urn:NBN:nl:ui:24-uuid:b11259b6-dc12-4c01-b409-2b8d9f0408a2 ; urn:NBN:nl:ui:24-uuid:b11259b6-dc12-4c01-b409-2b8d9f0408a2 ; http://resolver.tudelft.nl/uuid:b11259b6-dc12-4c01-b409-2b8d9f0408a2
Chicago Manual of Style (16th Edition):
Versluys, J. “De capillaire werkingen in den bodem.” 1916. Doctoral Dissertation, W. Versluys, Amsterdam. Accessed February 27, 2021.
http://resolver.tudelft.nl/uuid:b11259b6-dc12-4c01-b409-2b8d9f0408a2 ; urn:NBN:nl:ui:24-uuid:b11259b6-dc12-4c01-b409-2b8d9f0408a2 ; urn:NBN:nl:ui:24-uuid:b11259b6-dc12-4c01-b409-2b8d9f0408a2 ; http://resolver.tudelft.nl/uuid:b11259b6-dc12-4c01-b409-2b8d9f0408a2.
MLA Handbook (7th Edition):
Versluys, J. “De capillaire werkingen in den bodem.” 1916. Web. 27 Feb 2021.
Vancouver:
Versluys J. De capillaire werkingen in den bodem. [Internet] [Doctoral dissertation]. W. Versluys, Amsterdam; 1916. [cited 2021 Feb 27].
Available from: http://resolver.tudelft.nl/uuid:b11259b6-dc12-4c01-b409-2b8d9f0408a2 ; urn:NBN:nl:ui:24-uuid:b11259b6-dc12-4c01-b409-2b8d9f0408a2 ; urn:NBN:nl:ui:24-uuid:b11259b6-dc12-4c01-b409-2b8d9f0408a2 ; http://resolver.tudelft.nl/uuid:b11259b6-dc12-4c01-b409-2b8d9f0408a2.
Council of Science Editors:
Versluys J. De capillaire werkingen in den bodem. [Doctoral Dissertation]. W. Versluys, Amsterdam; 1916. Available from: http://resolver.tudelft.nl/uuid:b11259b6-dc12-4c01-b409-2b8d9f0408a2 ; urn:NBN:nl:ui:24-uuid:b11259b6-dc12-4c01-b409-2b8d9f0408a2 ; urn:NBN:nl:ui:24-uuid:b11259b6-dc12-4c01-b409-2b8d9f0408a2 ; http://resolver.tudelft.nl/uuid:b11259b6-dc12-4c01-b409-2b8d9f0408a2
Rhodes University
16.
Remsing, Carmen.
Finite element modelling of a magma chamber surrounded by country-rock, with particular reference to the groundwater flow in sections of different permeability.
Degree: MS, Faculty of Science, Physics, 2003, Rhodes University
URL: http://hdl.handle.net/10962/d1007537
► This thesis presents results of two-dimensional finite element modelling of a magma chamber surrounded by country-rock containing a section of high permeability. The high permeability…
(more)
▼ This thesis presents results of two-dimensional finite element modelling of a
magma chamber surrounded by country-rock containing a section of high permeability.
The high permeability section in the country-rock simulates structure that
is predominant in controlling the groundwater convection pattern and resulting
mineral deposits. The models have analogies in nature: for instance the gold
mines in the Massif Central of France, the Pogo mine in Alaska and the Pilgrim's
Rest gold field in South Africa. This is a complicated coupled system involving
fluid flow and heat transfer under extreme conditions. The magma in the chamber
convects and as it cools the heat liberated causes convection in the groundwater
contained in the surrounding country-rock. This convection in turn affects the rate
of liberation of heat from the magma. The software used for the modelling, FLOTRAN,
is the computational fluid dynamics component of the commercial ANSYS
package. The results obtained describe in detail the flow pattern in the magma
chamber, the country-rock and high permeability section thereof. During the cooling
of the magma chamber the groundwater convects more vigorously in the high
permeability section than elsewhere, and a convection cell is seen forming within
this region. This provides a mechanism for hydrothermal formation of valuable
mineral deposits in the structure near a magma chamber. It is found that the
relationship between the velocity of the flow in the cell and the temperature of the
magma chamber is well represented by a first order linear differential equation,
providing a simple understanding of this process
Subjects/Keywords: Magmas; Groundwater flow
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APA (6th Edition):
Remsing, C. (2003). Finite element modelling of a magma chamber surrounded by country-rock, with particular reference to the groundwater flow in sections of different permeability. (Masters Thesis). Rhodes University. Retrieved from http://hdl.handle.net/10962/d1007537
Chicago Manual of Style (16th Edition):
Remsing, Carmen. “Finite element modelling of a magma chamber surrounded by country-rock, with particular reference to the groundwater flow in sections of different permeability.” 2003. Masters Thesis, Rhodes University. Accessed February 27, 2021.
http://hdl.handle.net/10962/d1007537.
MLA Handbook (7th Edition):
Remsing, Carmen. “Finite element modelling of a magma chamber surrounded by country-rock, with particular reference to the groundwater flow in sections of different permeability.” 2003. Web. 27 Feb 2021.
Vancouver:
Remsing C. Finite element modelling of a magma chamber surrounded by country-rock, with particular reference to the groundwater flow in sections of different permeability. [Internet] [Masters thesis]. Rhodes University; 2003. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10962/d1007537.
Council of Science Editors:
Remsing C. Finite element modelling of a magma chamber surrounded by country-rock, with particular reference to the groundwater flow in sections of different permeability. [Masters Thesis]. Rhodes University; 2003. Available from: http://hdl.handle.net/10962/d1007537
17.
Anandakumar S.
Regional groundwater flow and subsurface hydrochemical
inverse mass balance modeling of lower bhavani river basin tamil
nadu india;.
Degree: Regional groundwater flow and subsurface hydrochemical
inverse mass balance modeling of lower bhavani river basin tamil
nadu india, 2014, Anna University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/26567
► Groundwater is commonly referred to as the water which lies below newlinethe surface of the earth occupying the interstices and voids in various newlineformations which…
(more)
▼ Groundwater is commonly referred to as the water
which lies below newlinethe surface of the earth occupying the
interstices and voids in various newlineformations which get annual
replenishment from meteoric precipitation The newlinequality of
groundwater is very important in evaluating its utility for
newlineagricultural domestic and industrial purposes Groundwater
always contains newlinesome amount of chemical substances and their
concentration is a function of newlinethe initial composition
rainfall land use type of surrounding rocks and the newlinerecharge
processes Variation of groundwater quality in an area is a function
newlineof physical and chemical parameters that are greatly
influenced by geological newlineformations rechargedischarge
mechanisms of groundwater and newlineanthropogenic activities
newline newline
Reference p.124-135
Advisors/Committee Members: Subramani T.
Subjects/Keywords:
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APA (6th Edition):
S, A. (2014). Regional groundwater flow and subsurface hydrochemical
inverse mass balance modeling of lower bhavani river basin tamil
nadu india;. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/26567
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, Anandakumar. “Regional groundwater flow and subsurface hydrochemical
inverse mass balance modeling of lower bhavani river basin tamil
nadu india;.” 2014. Thesis, Anna University. Accessed February 27, 2021.
http://shodhganga.inflibnet.ac.in/handle/10603/26567.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
S, Anandakumar. “Regional groundwater flow and subsurface hydrochemical
inverse mass balance modeling of lower bhavani river basin tamil
nadu india;.” 2014. Web. 27 Feb 2021.
Vancouver:
S A. Regional groundwater flow and subsurface hydrochemical
inverse mass balance modeling of lower bhavani river basin tamil
nadu india;. [Internet] [Thesis]. Anna University; 2014. [cited 2021 Feb 27].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/26567.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
S A. Regional groundwater flow and subsurface hydrochemical
inverse mass balance modeling of lower bhavani river basin tamil
nadu india;. [Thesis]. Anna University; 2014. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/26567
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Addis Ababa University
18.
ADDISU, DERESSA.
HYDROGEOCHEMIAL AND ISOTOPE HYDROLOGY IN INVESTIGATING GROUNDWATER RECHARGE AND FLOW PROCESSES; LOWER AFAR, EASTERN ETHIOPIA
.
Degree: 2013, Addis Ababa University
URL: http://etd.aau.edu.et/dspace/handle/123456789/885
► The research area includes the eastern part of the lower Awash Basin and Aysha Basin located in the eastern part of Ethiopia (South Afar). The…
(more)
▼ The research area includes the eastern part of the lower Awash Basin and Aysha Basin located in the eastern part of Ethiopia (South Afar). The areas have two physiographic regions the Rift and the Eastern Escarpment. Stable environmental isotopes (δ18O and δ 2H) and hydrogeochemistry of precipitation and
groundwater are used for the eastern lower Awash basin. However, only hydrogeochemistry is used for Aysha basin due to unreliability of isotopic laboratory results. The main objective of this research is to investigate
groundwater recharge and
flow processes in the area. The integrated application of hydrogeochemistry and stable isotope of water (2H and 18O) for investigating the recharge and
flow processes is a new approach for the area under consideration compared to the previous works in the area. The methodologies applied to achieve the objectives set are sampling and analysis, hierarchical cluster analysis (HCA), inverse geochemical modeling, the plot of δ18O vs δ 2H and chloride mass balance (CMB). Analyses of the water samples collected for physico-chemical and isotope were conducted at the laboratory of Water Works Design and Supervision Enterprise (WWDSE) and Addis Ababa University (AAU) respectively. Prior to using the water chemistry results for the intended application, charge balance evaluation is done and those with an error greater than 10% are rejected from the data set. Then hydrochemical facies analysis was conducted to identify the major water types. Accordingly, four major water types in the eastern lower Awash Basin: Ca-Mg-HCO3, Na-HCO3-, Na-Cl-SO42-, or Na- SO42-Cl and Ca-Mg-Cl-SO4 or Ca-Mg-SO42-Cl and two major water types in the Aysha Basin: Ca- (HCO3)2, and Na-Ca- SO4 or Cl were identified. Bicarbonate type water represent recharge area
groundwater in topographically higher areas and fast moving discharge area
groundwater in the rift. However, as
groundwater moves toward rift it evolves to chloride or sulfate water type. HCA also classified the groundwaters of eastern lower Awash basin in to two major groups and eight subgroups and that of Aysha basin in to two major groups and five subgroups. The spatial distribution map of HCA in the basins clearly indicated the
groundwater flow directions. Based on the clustering results inverse geochemical modelings are carried out along five selected
flow paths in the Awash Basin and along one path in the Aysha Basin. Accordingly, the results indicate dissolution of halite, anhydrite, silicate minerals, consumption of CO2 during silicate hydrolysis, cation-exchange, and precipitation of calcite and clay minerals along the
flow path toward the rift. For the eastern part of lower Awash Basin, the plot of δ18O vs δ2H for
groundwater identified three recharge mechanisms using local meteoric water line (LMWL) derived from Addis Ababa rainfall: recharge from local rainfalls, recharge from evaporated flood waters or mixing, and regional
groundwater which are most likely recharged by lateral infiltration of meteoric water. The integrated analysis of salinity…
Advisors/Committee Members: Dr. Seifu Kebede (advisor).
Subjects/Keywords: environmental isotopes;
flow processes;
Groundwater;
hydrogeochemistry;
recharge
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APA (6th Edition):
ADDISU, D. (2013). HYDROGEOCHEMIAL AND ISOTOPE HYDROLOGY IN INVESTIGATING GROUNDWATER RECHARGE AND FLOW PROCESSES; LOWER AFAR, EASTERN ETHIOPIA
. (Thesis). Addis Ababa University. Retrieved from http://etd.aau.edu.et/dspace/handle/123456789/885
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):
ADDISU, DERESSA. “HYDROGEOCHEMIAL AND ISOTOPE HYDROLOGY IN INVESTIGATING GROUNDWATER RECHARGE AND FLOW PROCESSES; LOWER AFAR, EASTERN ETHIOPIA
.” 2013. Thesis, Addis Ababa University. Accessed February 27, 2021.
http://etd.aau.edu.et/dspace/handle/123456789/885.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
ADDISU, DERESSA. “HYDROGEOCHEMIAL AND ISOTOPE HYDROLOGY IN INVESTIGATING GROUNDWATER RECHARGE AND FLOW PROCESSES; LOWER AFAR, EASTERN ETHIOPIA
.” 2013. Web. 27 Feb 2021.
Vancouver:
ADDISU D. HYDROGEOCHEMIAL AND ISOTOPE HYDROLOGY IN INVESTIGATING GROUNDWATER RECHARGE AND FLOW PROCESSES; LOWER AFAR, EASTERN ETHIOPIA
. [Internet] [Thesis]. Addis Ababa University; 2013. [cited 2021 Feb 27].
Available from: http://etd.aau.edu.et/dspace/handle/123456789/885.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
ADDISU D. HYDROGEOCHEMIAL AND ISOTOPE HYDROLOGY IN INVESTIGATING GROUNDWATER RECHARGE AND FLOW PROCESSES; LOWER AFAR, EASTERN ETHIOPIA
. [Thesis]. Addis Ababa University; 2013. Available from: http://etd.aau.edu.et/dspace/handle/123456789/885
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Rhodes University
19.
Harrison, Keith.
Finite element modelling of magma convection and attendant groundwater flow.
Degree: Faculty of Science, Physics and Electronics, 1998, Rhodes University
URL: http://hdl.handle.net/10962/d1005252
► This thesis describes preliminary two- and three-dimensional modelling of mass and heat transport of hot, molten magma in crustal intrusions and of the associated thermally…
(more)
▼ This thesis describes preliminary two- and three-dimensional modelling of mass and heat transport of hot, molten magma in crustal intrusions and of the associated thermally induced flow of groundwater contained in the surrounding country rock. The aim of such modelling is to create a tool with which to predict the location of mineral deposits formed by the transport and subsequent precipitation of minerals dissolved in the convecting groundwater. The momentum equations (Navier-Stokes equations), continuity equation and energy equation are used in conjunction with specially constructed density and viscosity relationships to govern the mass and heat transport processes of magma and groundwater. Finite element methods are used to solve the equations numerically for some simple model geometries. These methods are implemented by a commercial computer software code which is manipulated with a control program constructed by the author for the purpose. The models are of simple two- or three-dimensional geometries which all have an enclosed magma chamber surrounded completely by a shell of country rock through which groundwater is free to move. Modelling begins immediately after the intrusive event when the magma (in most cases rhyolitic) is at its greatest temperature. Heat is allowed to flow from the magma into the country rock causing thermal convection of the groundwater contained therein. The effect of the country rock as a porous medium on the flow of groundwater is modelled by including a distributed resistance term in the momentum equation. The computer code that controls the modelling is such that adaptions made to the models to represent real physical intrusive systems are trivial. Results of the research at this stage allow approximate prediction of the location of mineral deposits. Enhanced predictions can be made by effecting improvements to the models such as a more detailed representation of chemical processes, adaption of the computer code to allow multiple injections of magma and the modelling of frozen magma as a porous medium which admits the flow of groundwater.
Subjects/Keywords: Groundwater flow; Magmas
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APA ·
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Manager
APA (6th Edition):
Harrison, K. (1998). Finite element modelling of magma convection and attendant groundwater flow. (Thesis). Rhodes University. Retrieved from http://hdl.handle.net/10962/d1005252
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):
Harrison, Keith. “Finite element modelling of magma convection and attendant groundwater flow.” 1998. Thesis, Rhodes University. Accessed February 27, 2021.
http://hdl.handle.net/10962/d1005252.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Harrison, Keith. “Finite element modelling of magma convection and attendant groundwater flow.” 1998. Web. 27 Feb 2021.
Vancouver:
Harrison K. Finite element modelling of magma convection and attendant groundwater flow. [Internet] [Thesis]. Rhodes University; 1998. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10962/d1005252.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Harrison K. Finite element modelling of magma convection and attendant groundwater flow. [Thesis]. Rhodes University; 1998. Available from: http://hdl.handle.net/10962/d1005252
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Plymouth
20.
Ishemo, Carl Alexander Lugemalila.
The hydrology of a major valley wetland at Goss Moor, Cornwall.
Degree: PhD, 1999, University of Plymouth
URL: http://hdl.handle.net/10026.1/1123
► This thesis aims to fiimish an understanding of the water fluxes and storages occurring at the subcatchment scale in Goss Moor, a large lowland wetland…
(more)
▼ This thesis aims to fiimish an understanding of the water fluxes and storages occurring at the subcatchment scale in Goss Moor, a large lowland wetland in Cornwall, UK. Goss Moor constitutes approximately 5 km^ of poor fen and similar wetland areas sited on clayey alluvial and periglacial deposits in the base of a broad/shallow headwater valley. The bedrock is kaolinised granite and pelite. The hydrological characterisation was achieved using variables measured directly on site, using spectrally derived stream flow components and using flows output from a caUbrated numerical model of transient groundwater flow beneath the wetland. The study demonstrated the use of distributed spectral filtering for source area characterisation and of numerical modelling for investigathig the role of groundwater flow in the wetland. Certain stream flows into and out of the wetland were monitored at an hourly resolution. At each site, slowly- and quickly-varying components of flow were discriminated using a digital filter whose response was based upon an observed summer recession. Quick flows thus defined were found to be conserved during translation from the upsfream inputs to the outflow, although in-channel dispersion eliminated their flashiness. Conversely, the slow flow component was found to vary more rapidly at the wetland outflow than at the main stream entry, indicating the dominance of a different source of flow upon exit from the wetland. Overall stream flow gained by 50% in traversing the wetland site. Evapotranspiration (ET) rates in the wefland and in the outer catchment were estimated using the Penman-Monteith formula with measurements near or within the site. The calculations indicated that evapotranspirative losses would be greater from the wefland than from the remainder of its catchment due to the presence of surface water. U.S.G.S. MODFLOW was used to model the groundwater flow in the alluvium beneath the wefland. Shallow groundwater levels at 20 piezometer sites within the wefland, together with information on stratigraphy, rainfall and ET, provided boundary and caUbration data for the model. The results of in situ slug tests were used to define the aquifer permeability for the model in the transient calibration. Storativity and ET were adjusted to produce a match with the observed summer water table decline. A reduction of ET with falling water table greatly improved the match, and it was postulated that the declining water table had therefore dropped below the zone of greatest evapotranspirative uptake. By combining the various sources of data, the wefland's water budget was estimated. The numerical modeUing showed that groundwater flow to the river accounted for between only 0% and 3% of the total output from the wefland surface and substrata. ET accounted for 20% and surface runoff for 77-80%. Although wefland surface flow was not measured, the water budget showed that a substantial summer reduction in stored water would result if no peripheral inflows were received onto the wetiand surface. In the annual water…
Subjects/Keywords: 551.48; Groundwater flow
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APA ·
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APA (6th Edition):
Ishemo, C. A. L. (1999). The hydrology of a major valley wetland at Goss Moor, Cornwall. (Doctoral Dissertation). University of Plymouth. Retrieved from http://hdl.handle.net/10026.1/1123
Chicago Manual of Style (16th Edition):
Ishemo, Carl Alexander Lugemalila. “The hydrology of a major valley wetland at Goss Moor, Cornwall.” 1999. Doctoral Dissertation, University of Plymouth. Accessed February 27, 2021.
http://hdl.handle.net/10026.1/1123.
MLA Handbook (7th Edition):
Ishemo, Carl Alexander Lugemalila. “The hydrology of a major valley wetland at Goss Moor, Cornwall.” 1999. Web. 27 Feb 2021.
Vancouver:
Ishemo CAL. The hydrology of a major valley wetland at Goss Moor, Cornwall. [Internet] [Doctoral dissertation]. University of Plymouth; 1999. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10026.1/1123.
Council of Science Editors:
Ishemo CAL. The hydrology of a major valley wetland at Goss Moor, Cornwall. [Doctoral Dissertation]. University of Plymouth; 1999. Available from: http://hdl.handle.net/10026.1/1123
University of Hong Kong
21.
羅新.
Groundwater discharge
quantification in marine, and desert environments using radium
quartet, radon-222 and stable isotopes.
Degree: 2014, University of Hong Kong
URL: http://hdl.handle.net/10722/219974
► Groundwater discharge is an important component of global water cycle. Along with groundwater discharge, large amount of chemicals are transported and loaded into surface waters.…
(more)
▼ Groundwater discharge is an important
component of global water cycle. Along with groundwater discharge,
large amount of chemicals are transported and loaded into surface
waters. This thesis investigates groundwater discharge in both
terrestrial and marine environments using isotopic approaches.
Radium quartet and radon-222 (222Rn), highly concentrated in
groundwater and conservatively behaving during the transport, are
proved to be effective tracers in quantifying groundwater discharge
in various environments. Stable isotopes (δ 18O and δ 2H),
significantly fractionated during evaporation, are useful and
applicable in studying the water balance in arid waters.
Groundwater discharge is an important component of global water
cycle. Along with groundwater discharge, large amount of chemicals
are transported and loaded into surface waters. This thesis
investigates groundwater discharge in both terrestrial and marine
environments using isotopic approaches. Radium quartet and
radon-222 (222Rn), highly concentrated in groundwater and
conservatively behaving during the transport, are proved to be
effective tracers in quantifying groundwater discharge in various
environments. Stable isotopes (δ 18O and δ 2H), significantly
fractionated during evaporation, are useful and applicable in
studying the water balance in arid waters.
Desert lakes, lacking
of surface runoff, are mostly supplied by groundwater discharge.
These lakes play a vital role in maintaining desert water balance,
creating unique landscapes, supporting distinctive ecosystems. In
this thesis, radium quartet, 222Rn, δ 18O and δ 2H are used to
estimate groundwater discharge into the Badain Jaran Desert (BJD)
lakes and to reveal these lake evolutions. Most of the desert lakes
are flow through lakes, reflecting groundwater discharge is larger
than lake surface evaporation and explaining their existence in the
extremely arid environment. The salinazation time of the desert
lakes is estimated to start about 4000 yrs B.P.
Radium and radon
disequilibrium in the fractured aquifer system is used to estimate
the hydrogeological parameters such as water residence time,
effective surface area and mean aperture, based on long time
monitoring of radium and radon activities in the spring water.
Adsorption exerts a dominant effect in controlling radium quartet
transport in fracture aquifer system.
Subjects/Keywords: Groundwater flow - Measurement
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APA ·
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Manager
APA (6th Edition):
羅新. (2014). Groundwater discharge
quantification in marine, and desert environments using radium
quartet, radon-222 and stable isotopes. (Thesis). University of Hong Kong. Retrieved from http://hdl.handle.net/10722/219974
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
羅新. “Groundwater discharge
quantification in marine, and desert environments using radium
quartet, radon-222 and stable isotopes.” 2014. Thesis, University of Hong Kong. Accessed February 27, 2021.
http://hdl.handle.net/10722/219974.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
羅新. “Groundwater discharge
quantification in marine, and desert environments using radium
quartet, radon-222 and stable isotopes.” 2014. Web. 27 Feb 2021.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Vancouver:
羅新. Groundwater discharge
quantification in marine, and desert environments using radium
quartet, radon-222 and stable isotopes. [Internet] [Thesis]. University of Hong Kong; 2014. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10722/219974.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
羅新. Groundwater discharge
quantification in marine, and desert environments using radium
quartet, radon-222 and stable isotopes. [Thesis]. University of Hong Kong; 2014. Available from: http://hdl.handle.net/10722/219974
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Not specified: Masters Thesis or Doctoral Dissertation
University of Arizona
22.
Awadalla, Awadalla Messiha.
Thermally induced deformation and effects on groundwater flow in a discontinuous granite mass.
Degree: 1989, University of Arizona
URL: http://hdl.handle.net/10150/184851
► Existing analytical treatments of groundwater flow have mostly been founded on classical hydrodynamics, that groundwater motion is derivable from a velocity potential. This conception is…
(more)
▼ Existing analytical treatments of
groundwater flow have mostly been founded on classical hydrodynamics, that
groundwater motion is derivable from a velocity potential. This conception is in contradiction with the principle of conservation of energy, although it conforms with the principle of the conservation of mass (Hubbert, 1940, p. 285; Scheidegger, 1960, pps. 74-75; Bear, 1972, pps. 122-123). This dissertation shows that both principles can be utilized, based on the fact that a force potential at a point is equal to the work required to transfer a unit mass from this point to another point. This potential is given the symbol φ - gh - gz + (p/ρ) and is incorporated in the force field E. This potential is related to the
flow field (q) by the anisotropic hydraulic conductivity. This relation forms a solid formulation for the theory of the
flow of fluids through fractured porous media. This relation is applied to develop two basic equations. One partial differential equation, representing
flow in the fracture, depending on the actual geometry of the fracture and incorporating the anisotropic parameter of the hydraulic conductivity based on the thermal induced stress and the force potential. A second partial differential equation (storage equation) in two-dimensions for non-steady
groundwater flow in confined and saturated aquifers. This storage equation incorporates time, hydraulic conductivity and the radial coordinates. It is solved analytically using the Bessel's functions Jₒ and Kₒ. The two equations represent two models. Both the potential and the thermal hydraulic conductivity constitute a coupling between the two models to render the models a thermohydromechanical model. This aspect is the essential theme underlying this work and is implemented through a matrix-fracture system based on the slow
flow and the fast
flow behavior. The evaluation of the transient parameters including the aperture becomes possible and falls in line with the physics of the problem. This comprehensive analytical model is found to satisfy the transient demands of the mathematical physics. The application of the phenomena observed in the field from different sources and from Stripa Granite, rendered the model realistic and appropriate to the fractured porous media.
Advisors/Committee Members: Daemen, Jaak (advisor), Glass, Charles E. (committeemember), Farmer, Ian W. (committeemember), Davenport, William (committeemember), Keating, Kenneth (committeemember).
Subjects/Keywords: Groundwater flow.;
Granite.
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APA ·
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MLA ·
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Manager
APA (6th Edition):
Awadalla, A. M. (1989). Thermally induced deformation and effects on groundwater flow in a discontinuous granite mass.
(Doctoral Dissertation). University of Arizona. Retrieved from http://hdl.handle.net/10150/184851
Chicago Manual of Style (16th Edition):
Awadalla, Awadalla Messiha. “Thermally induced deformation and effects on groundwater flow in a discontinuous granite mass.
” 1989. Doctoral Dissertation, University of Arizona. Accessed February 27, 2021.
http://hdl.handle.net/10150/184851.
MLA Handbook (7th Edition):
Awadalla, Awadalla Messiha. “Thermally induced deformation and effects on groundwater flow in a discontinuous granite mass.
” 1989. Web. 27 Feb 2021.
Vancouver:
Awadalla AM. Thermally induced deformation and effects on groundwater flow in a discontinuous granite mass.
[Internet] [Doctoral dissertation]. University of Arizona; 1989. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10150/184851.
Council of Science Editors:
Awadalla AM. Thermally induced deformation and effects on groundwater flow in a discontinuous granite mass.
[Doctoral Dissertation]. University of Arizona; 1989. Available from: http://hdl.handle.net/10150/184851
University of Waterloo
23.
Pehme, Peeter.
New Approaches to the Collection and Interpretation of High Sensitivity Temperature Logs for Detection of Groundwater Flow in Fractured Rock.
Degree: 2012, University of Waterloo
URL: http://hdl.handle.net/10012/6859
► The use of temperature logging for identifying water flow through fractures in sedimentary rock has declined since the 1960’s and 70’s primarily because of low…
(more)
▼ The use of temperature logging for identifying water flow through fractures in sedimentary rock has declined since the 1960’s and 70’s primarily because of low sensor resolution and cross-connected flow along the borehole. Although sensor resolution has improved to the order of 10-3 C for several decades, temperature logging has not experienced a notable increase in popularity. This thesis studies these and other fundamental limitations to the application of borehole temperature logging for identifying flow through fractured rock, and tests the hypothesis that the limitations can be overcome, presents new methods for accomplishing that goal, and increases the applicability of the technology.
Although some conventional open-hole testing (e.g. flow meters) rely on vertical cross-connected flow in the borehole annulus to identify transmissive fractures, the flow is recognized to both distort open-hole temperature logs and facilitate chemical cross contamination. Removable polyurethane coated nylon liners have recently been developed to seal boreholes and minimize cross-contamination. High sensitivity temperature logs collected in the stagnant water column of lined boreholes under different hydrogeologic conditions herein show the degree to which cross connected flow can mask important flow conduits and thereby distort the interpretation of which fractures control flow. Results from the lined holes consistently lead to identification of more hydraulically active fractures than the open-hole profiles and an improved qualitative ranking of their relative importance to flow consistent with contaminant distributions observed in rock core.
The identification of flow in fractures with temperature logs depends on the presence of a temperature contrast between the water and the rock matrix to create an aberration in the otherwise gradually varying profile. Atmospherically driven thermal disequilibrium commonly only extends several tens of meters from surface and dissipates with depth, making temperatures logs a variable assessment of flow that is depth limited to the heterothermic zone. The active line source (ALS) method, a series of temperature logs measured before and within a day after the water column of a lined borehole is placed into thermal disequilibrium with the broader rock mass with a heating cable, is shown to provide two advantages. First, the method eliminates the depth limitation allowing flow zones to be identified below the hetro-homothermic boundary and second, the qualitative assessment of ambient water flow in fractures is improved throughout the test interval. The identification of the flow conduits is supported by the combined evidence from visual inspection of core, rock contamination profiles, acoustic televiewer logs and tests for hydraulic conductivity using straddle packers.
A new device, the thermal vector probe (TVP) is presented. It measures the temperature of the borehole fluid with four high sensitivity temperature sensors arranged in a tetrahedral pattern which is orientated using three…
Subjects/Keywords: Hydrophysics; Temperature; Fractured Rock; Groundwater flow
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APA (6th Edition):
Pehme, P. (2012). New Approaches to the Collection and Interpretation of High Sensitivity Temperature Logs for Detection of Groundwater Flow in Fractured Rock. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/6859
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):
Pehme, Peeter. “New Approaches to the Collection and Interpretation of High Sensitivity Temperature Logs for Detection of Groundwater Flow in Fractured Rock.” 2012. Thesis, University of Waterloo. Accessed February 27, 2021.
http://hdl.handle.net/10012/6859.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Pehme, Peeter. “New Approaches to the Collection and Interpretation of High Sensitivity Temperature Logs for Detection of Groundwater Flow in Fractured Rock.” 2012. Web. 27 Feb 2021.
Vancouver:
Pehme P. New Approaches to the Collection and Interpretation of High Sensitivity Temperature Logs for Detection of Groundwater Flow in Fractured Rock. [Internet] [Thesis]. University of Waterloo; 2012. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10012/6859.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Pehme P. New Approaches to the Collection and Interpretation of High Sensitivity Temperature Logs for Detection of Groundwater Flow in Fractured Rock. [Thesis]. University of Waterloo; 2012. Available from: http://hdl.handle.net/10012/6859
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Sydney
24.
Issa, Sanaa.
Hydrogeologic and 3-D Shallow Groundwater Flow Integrated Study and Salinisation Processes with Some Areas at Western Sydney, New South Wales, Australia
.
Degree: 2018, University of Sydney
URL: http://hdl.handle.net/2123/20915
► In South Western Sydney (which encompasses the study area), New South Wales, Australia, salinity is a major emerging urban problem and is primarily related to…
(more)
▼ In South Western Sydney (which encompasses the study area), New South Wales, Australia, salinity is a major emerging urban problem and is primarily related to rising groundwater level. This eight-chapter thesis focuses on the factors influencing salinity and its processes in the Mount Annan, Currans Hills and Narellan Vale areas, and investigates both the present three-dimensional (3-D) groundwater flow pattern and that expected to occur in the area as a result of future urban expansion. The chemical and physical analyses carried out on the soil samples collected from the study areas, and the groundwater level and electrical conductivity data have been interpreted in a comprehensive integrated manner to identify factors and processes influencing salinity, and to develop a reliable and detailed hydrogeological conceptual model. A new method has been developed for groundwater recharge estimation for unconfined aquifers under the assumption that groundwater recharge is solely due to rainfall. The method is capable of estimating groundwater recharge and drainage and predicting groundwater levels from time series of observed groundwater level data and rainfall events. The method can produce non-unique solution. Despite the non-uniqueness, the estimated recharges do not suffer large variations. A 3-D groundwater flow model has been developed by calibrating the measured groundwater level data using the MODFLOW code. The groundwater flow maps constructed from the 3-D calibration results have shown that the flow pattern is collectively controlled by topography and recharge, and varies in space and time, which likely suggests that the salinisation process, which is influenced by the lateral and vertical groundwater movements, varies in space and time. Analysis has revealed that future urbanisation likely results in changes in the subsurface water balance. Conclusions and suggested avenues for future research are drawn in Chapter 8.
Subjects/Keywords: Groundwater flow;
salinisation processes;
Western Sydney
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APA (6th Edition):
Issa, S. (2018). Hydrogeologic and 3-D Shallow Groundwater Flow Integrated Study and Salinisation Processes with Some Areas at Western Sydney, New South Wales, Australia
. (Thesis). University of Sydney. Retrieved from http://hdl.handle.net/2123/20915
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):
Issa, Sanaa. “Hydrogeologic and 3-D Shallow Groundwater Flow Integrated Study and Salinisation Processes with Some Areas at Western Sydney, New South Wales, Australia
.” 2018. Thesis, University of Sydney. Accessed February 27, 2021.
http://hdl.handle.net/2123/20915.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Issa, Sanaa. “Hydrogeologic and 3-D Shallow Groundwater Flow Integrated Study and Salinisation Processes with Some Areas at Western Sydney, New South Wales, Australia
.” 2018. Web. 27 Feb 2021.
Vancouver:
Issa S. Hydrogeologic and 3-D Shallow Groundwater Flow Integrated Study and Salinisation Processes with Some Areas at Western Sydney, New South Wales, Australia
. [Internet] [Thesis]. University of Sydney; 2018. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/2123/20915.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Issa S. Hydrogeologic and 3-D Shallow Groundwater Flow Integrated Study and Salinisation Processes with Some Areas at Western Sydney, New South Wales, Australia
. [Thesis]. University of Sydney; 2018. Available from: http://hdl.handle.net/2123/20915
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of British Columbia
25.
Laidlaw, James Stuart.
Tomographic techniques and their application to geotechnical and groundwater flow problems.
Degree: Master of Applied Science - MASc, Geological Sciences, 1987, University of British Columbia
URL: http://hdl.handle.net/2429/28493
► Most downhole tools in use today measure properties immediately adjacent to the borehole, and as such, only a small portion of the subsurface volume is…
(more)
▼ Most downhole tools in use today measure properties immediately adjacent to the borehole, and as such, only a small portion of the subsurface volume is known with any degree of certainty. When dealing with geologic situations which are characteristically heterogeneous, the engineer often requires more information than what present tests can provide.
Tomography is an in-situ testing method that allows the generation of a two dimensional subsurface image by reconstructing material property variations between boreholes. It is essentially a solution to the inverse problem where signals are measured and, through computer manipulation, are used to infer material contrasts in the subsurface.
For the purposes of this thesis, a two dimensional configuration is used to demonstrate and evaluate the tomographic technique with source and receiver locations positioned at intervals down adjacent and nearly vertical boreholes. Both iterative and direct matrix solution methods are used to evaluate the use of seismic and groundwater flow data for subsurface tomography. The iterative methods include a variation of the classical algebraic reconstruction technique (CART), a modified version of the ART algorithm (MART), and a modified version of the ART algorithm using the Chebyshev norm criterion (LART). The purpose of the iterative tests is to determine the best algorithm for signal reconstruction when data noise and different damping parameters are applied.
The matrix methodologies include a constrained L¹ linear approximation algorithm and singular value decomposition routines (SVD). These methods solve the set of linear equations (Ax = b) which the tomographic techniques produce. The purpose of this stage of testing is to optimize a direct method of solution to the sets of linear equations such that different forms of anomaly can be discerned.
Numerous synthetic seismic and groundwater data sets are used by both iterative and matrix algorithms. Seismic test data sets are generated by calculation of transit times through materials of known seismic velocity. Groundwater test data sets are generated by drawdown analyses and finite element procedures.
All algorithms demonstrate a reasonable ability at reconstructing sections which closely re-sembled the known profiles. Vertical anomalies, however, are not as well defined as horizontal anomalies. This is primarily a result of incomplete cross-hole scanning geometry which also affects the rank and condition of the matrices used by the direct forms of solution. The addition of Gaussian
noise to the data produces poor reconstructions regardless of the type of algorithm used. This emphasizes the fact that tomographic techniques require clear and relatively error-free signals.
Subjects/Keywords: Tomography; Groundwater flow
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APA (6th Edition):
Laidlaw, J. S. (1987). Tomographic techniques and their application to geotechnical and groundwater flow problems. (Masters Thesis). University of British Columbia. Retrieved from http://hdl.handle.net/2429/28493
Chicago Manual of Style (16th Edition):
Laidlaw, James Stuart. “Tomographic techniques and their application to geotechnical and groundwater flow problems.” 1987. Masters Thesis, University of British Columbia. Accessed February 27, 2021.
http://hdl.handle.net/2429/28493.
MLA Handbook (7th Edition):
Laidlaw, James Stuart. “Tomographic techniques and their application to geotechnical and groundwater flow problems.” 1987. Web. 27 Feb 2021.
Vancouver:
Laidlaw JS. Tomographic techniques and their application to geotechnical and groundwater flow problems. [Internet] [Masters thesis]. University of British Columbia; 1987. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/2429/28493.
Council of Science Editors:
Laidlaw JS. Tomographic techniques and their application to geotechnical and groundwater flow problems. [Masters Thesis]. University of British Columbia; 1987. Available from: http://hdl.handle.net/2429/28493
University of Alaska – Fairbanks
26.
Paturi, Sairavichand.
Groundwater flow in a vertical plane at the interface of permafrost
.
Degree: 2017, University of Alaska – Fairbanks
URL: http://hdl.handle.net/11122/7898
► Groundwater dynamics in discontinuous permafrost aquifers are complex. The topography of permafrost redirects flow in difficult-to-predict directions that can be tens of degrees off from…
(more)
▼ Groundwater dynamics in discontinuous permafrost aquifers are complex. The topography of permafrost redirects
flow in difficult-to-predict directions that can be tens of degrees off from the regional
flow direction. Large zones of permafrost vertically separate aquifers into supra and sub-permafrost portions. The
flow dynamics in each portion of the aquifer may be dissimilar due to different controlling boundary conditions. In areas of discontinuities in permafrost, known as open taliks,
groundwater in the two portions of the aquifer may mix. These areas of mixing are the focus of this study, in particular, the
groundwater dynamics in taliks located in the floodplain of lower reaches of rivers. The study hypothesizes that
groundwater flow in floodplain taliks of lower reaches of rivers will bifurcate between the supra and sub-permafrost portions of a discontinuous permafrost aquifer. To test this hypothesis gradient, magnitudes and
flow directions were determined at several depths ranging from the water table to 150 ft. (45.7 m) below ground surface, using a linear interpolation scheme in various locations in a floodplain talik. Errors in water level measurements due to instrument errors as well as vertically moving wells were propagated into the gradient calculations by Monte Carlo analysis. Results from this research show that a vertical divide in
groundwater flow forms a short distance below the top of permafrost.
Groundwater flow above the divide routes into the unconfined supra-permafrost portion of the aquifer. Water below the divide flows into the confined portion of the aquifer below permafrost. The position of the vertical
groundwater divide may adjust in relation to the water table position. Additionally, a methodology is presented for stochastically propagating measurement errors into gradient analyses by Monte Carlo analysis. Understanding the
flow dynamics in discontinuous permafrost aquifers is key to the understanding of contaminant transport, aquifer recharge, and resource development in subarctic environments.
Advisors/Committee Members: Leigh, Mary Beth (committee).
Subjects/Keywords: Groundwater flow;
Alaska;
North Pole;
Dynamics;
Groundwater;
Water table;
Permafrost;
Groundwater recharge;
Base flow (Hydrology);
Hydrogeology
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CSE |
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APA (6th Edition):
Paturi, S. (2017). Groundwater flow in a vertical plane at the interface of permafrost
. (Thesis). University of Alaska – Fairbanks. Retrieved from http://hdl.handle.net/11122/7898
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):
Paturi, Sairavichand. “Groundwater flow in a vertical plane at the interface of permafrost
.” 2017. Thesis, University of Alaska – Fairbanks. Accessed February 27, 2021.
http://hdl.handle.net/11122/7898.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Paturi, Sairavichand. “Groundwater flow in a vertical plane at the interface of permafrost
.” 2017. Web. 27 Feb 2021.
Vancouver:
Paturi S. Groundwater flow in a vertical plane at the interface of permafrost
. [Internet] [Thesis]. University of Alaska – Fairbanks; 2017. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/11122/7898.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Paturi S. Groundwater flow in a vertical plane at the interface of permafrost
. [Thesis]. University of Alaska – Fairbanks; 2017. Available from: http://hdl.handle.net/11122/7898
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Florida
27.
Schmahl, William E.
Field Testing of Aluminum Water Treatment Residuals as a Permeable Reactive Barrier System to Reduce Soluble Phosphorus Movement in Groundwater.
Degree: MS, Soil and Water Science, 2016, University of Florida
URL: https://ufdc.ufl.edu/UFE0050007
► High phosphorus (P) loading to Lake Okeechobee during the past several decades has resulted in pronounced eutrophication with corresponding impacts on the lakes ecosystem. A…
(more)
▼ High phosphorus (P) loading to Lake Okeechobee during the past several decades has resulted in pronounced eutrophication with corresponding impacts on the lakes ecosystem. A large portion of this P loading is sourced from agricultural and livestock operations in the Northern Lake Okeechobee Basin (LOB). A major source of P is from cow manure as a result of intense livestock operations or from being applied as a fertilizer. In many soils P is bound within the soil however Spodosols of South Florida lack the capacity to retain much phosphorus and a large percentage of soluble P is leached through the soil and transported via
groundwater to the surface water drainage network, eventually making its way into Lake Okeechobee.
Advisors/Committee Members: JAWITZ,JAMES W (committee chair), O'CONNOR,GEORGE A (committee member), LATIMER,STANLEY STEVE (committee member).
Subjects/Keywords: Ditches; Groundwater; Groundwater flow; Groundwater level; Lakes; Phosphorus; Ranches; Soils; Torsades de Pointes; Water flow; prb; Lake Okeechobee ( local )
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APA (6th Edition):
Schmahl, W. E. (2016). Field Testing of Aluminum Water Treatment Residuals as a Permeable Reactive Barrier System to Reduce Soluble Phosphorus Movement in Groundwater. (Masters Thesis). University of Florida. Retrieved from https://ufdc.ufl.edu/UFE0050007
Chicago Manual of Style (16th Edition):
Schmahl, William E. “Field Testing of Aluminum Water Treatment Residuals as a Permeable Reactive Barrier System to Reduce Soluble Phosphorus Movement in Groundwater.” 2016. Masters Thesis, University of Florida. Accessed February 27, 2021.
https://ufdc.ufl.edu/UFE0050007.
MLA Handbook (7th Edition):
Schmahl, William E. “Field Testing of Aluminum Water Treatment Residuals as a Permeable Reactive Barrier System to Reduce Soluble Phosphorus Movement in Groundwater.” 2016. Web. 27 Feb 2021.
Vancouver:
Schmahl WE. Field Testing of Aluminum Water Treatment Residuals as a Permeable Reactive Barrier System to Reduce Soluble Phosphorus Movement in Groundwater. [Internet] [Masters thesis]. University of Florida; 2016. [cited 2021 Feb 27].
Available from: https://ufdc.ufl.edu/UFE0050007.
Council of Science Editors:
Schmahl WE. Field Testing of Aluminum Water Treatment Residuals as a Permeable Reactive Barrier System to Reduce Soluble Phosphorus Movement in Groundwater. [Masters Thesis]. University of Florida; 2016. Available from: https://ufdc.ufl.edu/UFE0050007
Texas Tech University
28.
-1823-8485.
Estimating streamflow-recession indexes using automated methods with application to groundwater and surface water interaction.
Degree: MS, Geosciences, 2018, Texas Tech University
URL: http://hdl.handle.net/2346/74398
► Statistical properties of streamflow recession provide evidence of complex hydrologic processes such as groundwater and surface-water interactions. Bingham (1982, 1986) sought regional definition of generalized…
(more)
▼ Statistical properties of streamflow recession provide evidence of complex hydrologic processes such as
groundwater and surface-water interactions. Bingham (1982, 1986) sought regional definition of generalized connectivity between surface water and
groundwater through the computation of persistent streamflow-recession indexes during winter low flows and subsequent regionalization using surficial geology. The streamflow-recession indexes were derived through a hands-on graphical method for selected peak flows from over 200 unregulated U.S. Geological Survey streamgages with at least 20 years of daily-mean record in Tennessee and Alabama. A streamflow recession curve, plotted on semilog graph paper, was created starting at peak streamflow after a precipitation event until the line neared asymptotic with the horizontal axis. The number of days (x-axis) required for streamflow to decrease one log10-cycle (y-axis) was the streamflow-recession index for the station expressed in days per log10-cycle decline in
flow. The streamflow-recession indexes determined by Bingham were somewhat subjective because they were derived from visual inspection of two to eight ideal streamflow hydrographs from each streamgage. Boundaries for streamflow-recession index regionalization were determined using streamflow hydrographs, surficial geology, and lithologic contacts. Although streamflow-recession index values have been useful in statistical regionalization studies (Bingham, 1982, 1986; Knight and others, 2012), the subjectivity and time-consuming manual method of the approach has made it problematic to compute streamflow-recession indexes for areas outside of Alabama and Tennessee and using current (2018) streamflow data.
For this study, the computationally derived streamflow-recession index is referred to as the “geologic factor” or Gfactor. Gfactor is computed by extracting the daily-streamflow mean for the period of record of the streamgage. The daily-streamflow mean is converted from cubic feet per second to log10-cycle change in
flow from the previous day with units of days per log10-cycle change in
flow. Days with
flow less than the previous day are isolated represent a decrease in
flow. The days per log10-cycle change of declining streamflow are plotted as a distribution curve. The 90th percentile was selected as the empirical Gfactor for the streamgage after exploratory comparisons to Bingham's earlier work. This method is applied to 312 streamgages and more than 4.8 million days of streamflow at streams in or bordering Tennessee in the streamflow-recession index areas delineated by Bingham (1986). Results from the automated process are compared to the original Gfactor estimates from the streamflow-recession index areas created by Bingham (1986) to assess whether the method is capturing the similar conceptual information about hydrologic processes.
The spatial distribution of potential categorical predictor variables or factors are presented. Categorical variables such as soil type, ecoregion, aquifer outcrop, and…
Advisors/Committee Members: Lehman, Thomas (committee member), Barnes, Melanie (committee member), Asquith, William H. (Committee Chair).
Subjects/Keywords: streamflow-recession index; base flow; low flow; groundwater; surface water
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APA (6th Edition):
-1823-8485. (2018). Estimating streamflow-recession indexes using automated methods with application to groundwater and surface water interaction. (Masters Thesis). Texas Tech University. Retrieved from http://hdl.handle.net/2346/74398
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Chicago Manual of Style (16th Edition):
-1823-8485. “Estimating streamflow-recession indexes using automated methods with application to groundwater and surface water interaction.” 2018. Masters Thesis, Texas Tech University. Accessed February 27, 2021.
http://hdl.handle.net/2346/74398.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
MLA Handbook (7th Edition):
-1823-8485. “Estimating streamflow-recession indexes using automated methods with application to groundwater and surface water interaction.” 2018. Web. 27 Feb 2021.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Vancouver:
-1823-8485. Estimating streamflow-recession indexes using automated methods with application to groundwater and surface water interaction. [Internet] [Masters thesis]. Texas Tech University; 2018. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/2346/74398.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Council of Science Editors:
-1823-8485. Estimating streamflow-recession indexes using automated methods with application to groundwater and surface water interaction. [Masters Thesis]. Texas Tech University; 2018. Available from: http://hdl.handle.net/2346/74398
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
University of the Western Cape
29.
Xiao, Liang.
Evaluation of groundwater flow theories and aquifer parameters estimation
.
Degree: 2014, University of the Western Cape
URL: http://hdl.handle.net/11394/4366
► This thesis deals with some fundamental aspects of groundwater models. Deterministic mathematical models of groundwater are usually used to simulate flow and transport processes in…
(more)
▼ This thesis deals with some fundamental aspects of
groundwater models. Deterministic mathematical models of
groundwater are usually used to simulate
flow and transport processes in aquifer systems by means of partial differential equations. Analytical solutions for the deterministic mathematical models of the Theis problem and the transient confined-unconfined
flow in a confined aquifer are investigated in the thesis. The Theis equation is a most commonly applied solution for the deterministic mathematical model of the Theis problem. In the thesis, a most simplified similarity transformation method for derivation of the Theis equation is proposed by using the Boltzmann transform. To investigate the transient confined-unconfined
flow towards a fully penetrating well in a confined aquifer, a new analytical solution for the deterministic mathematical models of interest is proposed in the thesis. The proposed analytical solution considers a change of hydraulic properties (transmissivity and storativity) during the confined-unconfined conversion. Based on the proposed analytical solution, a practical method to determine distance of the conversion interface from pumping well and diffusivity of the unconfined region is developed by using a constant rate test. Applicability of the proposed analytical solution is demonstrated by a comparison with previous solutions, namely the MP and the Chen models. The results show that the proposed analytical solution can be used to assess the effect of the change of diffusivity on the transient confined-unconfined
flow. The MP model is only accepted if the transmissivity during the confined-unconfined conversion is constant. The Chen model, given as a special case of the proposed analytical solution, is limited to the analysis of the transient confined-unconfined
flow with a fixed diffusivity. An important application of
groundwater models is to estimate parameters, such as hydraulic properties and
flow dynamics, of
groundwater systems by assessing and analysing field data. For instance, the pumping and the hydrochemistry and environmental tracer tests are two effective ways to obtain such data. To evaluate hydraulic properties of aquifer systems by derivative interpretation of drawdown data from pumping tests, a new diagnostic analysis method is proposed based on a lg-lg drawdown derivative, dlgs/dlgt, and the differentiation algorithm namely Lagrange Interpolation Regression (LIR) in the thesis. Use of a combined plot of dlgs/dlgt and a semi-lg drawdown derivative (ds/dlgt) is made to identify various
flow segments during variable discharge tests with infinite conditions, constant rate tests in bounded aquifers and tests involving double-porosity behaviours. These can be applied to further characterize pumped aquifers. Compared to traditional diagnostic analysis method using plot of ds/dlgt alone, the combined drawdown derivative plot possesses certain advantages identified as: (1) the plot of dlgs/dlgt is strikingly sensitive for use in unveiling differences between pumping and its…
Advisors/Committee Members: Xu, Yongxin (advisor), Lin, Lixiang (advisor).
Subjects/Keywords: Deterministic mathematical models;
Theis problem;
Transient confined-unconfined flow;
Groundwater flow
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APA ·
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Export
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Manager
APA (6th Edition):
Xiao, L. (2014). Evaluation of groundwater flow theories and aquifer parameters estimation
. (Thesis). University of the Western Cape. Retrieved from http://hdl.handle.net/11394/4366
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):
Xiao, Liang. “Evaluation of groundwater flow theories and aquifer parameters estimation
.” 2014. Thesis, University of the Western Cape. Accessed February 27, 2021.
http://hdl.handle.net/11394/4366.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Xiao, Liang. “Evaluation of groundwater flow theories and aquifer parameters estimation
.” 2014. Web. 27 Feb 2021.
Vancouver:
Xiao L. Evaluation of groundwater flow theories and aquifer parameters estimation
. [Internet] [Thesis]. University of the Western Cape; 2014. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/11394/4366.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Xiao L. Evaluation of groundwater flow theories and aquifer parameters estimation
. [Thesis]. University of the Western Cape; 2014. Available from: http://hdl.handle.net/11394/4366
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of British Columbia
30.
Forster, Craig Burton.
Interaction of groundwater flow systems and thermal regimes in mountainous terrain : a numerical study.
Degree: PhD, Geological Sciences, 1987, University of British Columbia
URL: http://hdl.handle.net/2429/27300
► It is widely recognized that topographically-driven groundwater flow can perturb conductive thermal regimes. High-relief topography amplifies the impact of factors controlling groundwater flow and advective…
(more)
▼ It is widely recognized that topographically-driven
groundwater flow can perturb conductive thermal regimes.
High-relief topography amplifies the impact of factors
controlling groundwater flow and advective heat transfer. A
finite element method is developed to model the influence of
geology, climate, surface topography and regional heat flux
on steady groundwater flow and heat transfer. Because fluid
viscosity (hence fluid flux) depends upon temperature,
groundwater flow is influenced by the regional heat flux. As
a consequence, isothermal approaches to modeling deep
groundwater flow in mountains may be inappropriate. Using a
free-surface approach, the water table is represented as an
internal characteristic of the groundwater flow system,
rather than the upper boundary for fluid flow. Thick
unsaturated zones are expected in high-permeability terrain
(greater than 10⁻¹⁵ m²) with arid climate, or where
groundwater recharge is restricted by extensive alpine
glaciers. Only vertical fluid flow is assumed to occur in
the unsaturated zone, therefore, heat transfer above the
water table is represented by one-dimensional advection and
two-dimensional conduction. Simulation results indicate that
water table elevations are highly sensitive to changes in
the controlling factors, but have little impact on the
thermal regime. Conductive thermal regimes are predicted in
low-permeability terrain (less than 10⁻¹⁸ m²) or in
high-permeability terrain with arid climate (recharge rates less than 10⁻¹¹ m/sec). Strong advective heat transfer masks the regional heat flux when permeability exceeds 10⁻¹⁶ m² in terrain with relief of 2 km over a horizontal distance of 6 km. Less than one percent of typical mean annual precipitation is transmitted through deep groundwater flow systems under these conditions. Asymmetric surface topography complicates efforts to interpret chemical and thermal data collected near the valley floor. Fracture zones outcropping at the valley floor can capture a large percentage of groundwater flowing through the system and a significant percentage of the basal heat flux. Maximum spring temperatures are indicated when bulk permeability is between 10⁻¹⁷ m² and 10⁻¹⁵ m². Outside this range, spring temperatures approach ambient air temperature. Topographically driven groundwater flow can distort and obliterate free-convection cells that might otherwise develop within a mountain massif.
Subjects/Keywords: Terrestrial heat flow; Groundwater flow
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Manager
APA (6th Edition):
Forster, C. B. (1987). Interaction of groundwater flow systems and thermal regimes in mountainous terrain : a numerical study. (Doctoral Dissertation). University of British Columbia. Retrieved from http://hdl.handle.net/2429/27300
Chicago Manual of Style (16th Edition):
Forster, Craig Burton. “Interaction of groundwater flow systems and thermal regimes in mountainous terrain : a numerical study.” 1987. Doctoral Dissertation, University of British Columbia. Accessed February 27, 2021.
http://hdl.handle.net/2429/27300.
MLA Handbook (7th Edition):
Forster, Craig Burton. “Interaction of groundwater flow systems and thermal regimes in mountainous terrain : a numerical study.” 1987. Web. 27 Feb 2021.
Vancouver:
Forster CB. Interaction of groundwater flow systems and thermal regimes in mountainous terrain : a numerical study. [Internet] [Doctoral dissertation]. University of British Columbia; 1987. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/2429/27300.
Council of Science Editors:
Forster CB. Interaction of groundwater flow systems and thermal regimes in mountainous terrain : a numerical study. [Doctoral Dissertation]. University of British Columbia; 1987. Available from: http://hdl.handle.net/2429/27300
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Open Access Theses and Dissertations
