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Texas A&M University
1.
Scott, Tommi Jo Grace.
Measuring the Effectiveness of Educational Tools and Hyrdologic Metrics in Raising Awareness About Stormwater Sustainability.
Degree: MS, Civil Engineering, 2011, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-10043 
► Urbanization of watersheds leads to the degradation of watershed health, as increased areas of imperviousness produce alterations in the flow regime of receiving water bodies.…
(more)
▼ Urbanization of watersheds leads to the degradation of watershed health, as increased areas of imperviousness produce alterations in the flow regime of receiving water bodies. While centralized infrastructure improvements, such as detention ponds, are typically implemented to manage excess runoff, a more decentralized approach that utilizes Low Impact Development (LID) design principles may better preserve the predevelopment flow regime. Peak flow is traditionally used to design both of these types of infrastructure, but this does not capture the changes in the flow regime, nor does it convey the importance of stormwater sustainability to the general public. To further the general public's understanding about stormwater sustainability, an educational tool was used to take a complicated issue and make it easier to understand by a layperson. The first purpose of this work was to explore the effectiveness of educational tools that may be developed to increase public awareness about issues of watershed sustainability and encourage adoption of sustainable stormwater controls. To increase knowledge about stormwater sustainability and encourage more sustainable practices, a new stormwater sustainability metric, the hydrologic footprint residence (HFR), was recently introduced to measure more holistically the impacts of urbanization on the downstream residence. HFR measures changes to the flow regime as the area of land inundated for one unit of time in response to one rainfall event, which is a more relatable metric than peak flow for the general public. It was the second purpose of this work is to explore the effectiveness of HFR in communicating the impacts of urbanization on watershed health, as compared to traditional stormwater metrics, such as peak flow. To test these different objectives, collaboration with the Communication and the Computer Engineering Departments at
Texas A&
M University was needed to create a survey, which helped evaluate the effectiveness of the educational tool in educating the general public about stormwater sustainability, and encouraging more sustainable practices. The survey was also used to evaluate and compare the use of HFR and peak flow within the quiz for communicating to the general public about stormwater sustainability. Results indicated the quiz was useful for educating the public about stormwater sustainability, encouraging more sustainable practices. In addition, results indicated the HFR was more effective than peak flow in educating the public about LIDs.
Advisors/Committee Members: Zechman, Emily (advisor), Wurbs, Ralph (advisor), Barbour, Joshua (committee member).
Subjects/Keywords: watershed management; low impact development; public awareness tools; web-based interactive game
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APA (6th Edition):
Scott, T. J. G. (2011). Measuring the Effectiveness of Educational Tools and Hyrdologic Metrics in Raising Awareness About Stormwater Sustainability. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-10043
Chicago Manual of Style (16th Edition):
Scott, Tommi Jo Grace. “Measuring the Effectiveness of Educational Tools and Hyrdologic Metrics in Raising Awareness About Stormwater Sustainability.” 2011. Masters Thesis, Texas A&M University. Accessed April 13, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-10043.
MLA Handbook (7th Edition):
Scott, Tommi Jo Grace. “Measuring the Effectiveness of Educational Tools and Hyrdologic Metrics in Raising Awareness About Stormwater Sustainability.” 2011. Web. 13 Apr 2021.
Vancouver:
Scott TJG. Measuring the Effectiveness of Educational Tools and Hyrdologic Metrics in Raising Awareness About Stormwater Sustainability. [Internet] [Masters thesis]. Texas A&M University; 2011. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-10043.
Council of Science Editors:
Scott TJG. Measuring the Effectiveness of Educational Tools and Hyrdologic Metrics in Raising Awareness About Stormwater Sustainability. [Masters Thesis]. Texas A&M University; 2011. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-10043
Texas A&M University
2.
Yang, Mingyue.
Application of Indicators of Hydrologic Alteration to Ecological Hydrology in Trinity and Brazos River Basins.
Degree: MS, Water Management and Hydrological Science, 2016, Texas A&M University
URL: http://hdl.handle.net/1969.1/161269
► As the demand for water resources has been increasing all around the world, intense water appropriation has led to alterations of flow regimes over time.…
(more)
▼ As the demand for water resources has been increasing all around the world, intense water appropriation has led to alterations of flow regimes over time. Changes in environmental flows have impaired beneficial functions of ecosystems. Thus, the protection of environmental instream flows to maintain healthy ecosystems has become more and more critical. The
Texas Commission on Environmental Quality (TCEQ) has established environmental flow standards through a process established by the
Texas Legislature in its 2007 Senate Bill 3 (SB3). The SB3 has expedited the process of developing methodologies and tools to analyze and quantify alterations in environmental flows. Furthermore, with the experts’ participation, the establishment of SB3 has helped lawmakers to improve regulations, laws, and water management practices.
This thesis applies the Indicators of Hydrologic Alteration (IHA) software and the TCEQ Water Availability Modeling (WAM) System allied with Hydrologic Engineering Center Data Storage System (HEC-DSS) to analyze and quantify flow conditions at 13 gaging stations in the Trinity River Basin and 20 gaging stations in the Brazos River Basins. The thesis focuses on three types of flows: observed flow, WAM naturalized flow, and WAM simulated regulated flow. The thesis explores long-term alterations in different types of flow characteristics in research areas, develops meaningful frequency metrics, and evaluates capabilities of different methodologies. The results reveal the differences and similarities of alterations in long-term flow characteristics in Trinity and Brazos River Basins. In addition, this thesis proves that the application of IHA is meaningful. Also, the use of the WAM System is fundamental in this thesis.
Advisors/Committee Members: Wurbs, Ralph (advisor), Brumbelow, Kelly (committee member), Ma, Xingmao (committee member).
Subjects/Keywords: Ecological Hydrology; Indicators of Hydrologic Alteration; Water Availability Model; Water Right Analysis Package; Trinity River Basin; Brazos River Basin
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APA (6th Edition):
Yang, M. (2016). Application of Indicators of Hydrologic Alteration to Ecological Hydrology in Trinity and Brazos River Basins. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/161269
Chicago Manual of Style (16th Edition):
Yang, Mingyue. “Application of Indicators of Hydrologic Alteration to Ecological Hydrology in Trinity and Brazos River Basins.” 2016. Masters Thesis, Texas A&M University. Accessed April 13, 2021.
http://hdl.handle.net/1969.1/161269.
MLA Handbook (7th Edition):
Yang, Mingyue. “Application of Indicators of Hydrologic Alteration to Ecological Hydrology in Trinity and Brazos River Basins.” 2016. Web. 13 Apr 2021.
Vancouver:
Yang M. Application of Indicators of Hydrologic Alteration to Ecological Hydrology in Trinity and Brazos River Basins. [Internet] [Masters thesis]. Texas A&M University; 2016. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/1969.1/161269.
Council of Science Editors:
Yang M. Application of Indicators of Hydrologic Alteration to Ecological Hydrology in Trinity and Brazos River Basins. [Masters Thesis]. Texas A&M University; 2016. Available from: http://hdl.handle.net/1969.1/161269
Texas A&M University
3.
Bastidas Pacheco, Camilo Jose.
Characterizing Residential Water Use in College Station and Assessing the Effectiveness of Educational Programs to Reduce Outdoor Water Use.
Degree: MS, Water Management and Hydrological Science, 2018, Texas A&M University
URL: http://hdl.handle.net/1969.1/173299
► Texas voters and the legislature have made water conservation an important requirement for cities. Landscape irrigation is the largest component of Texas single family residential…
(more)
▼ Texas voters and the legislature have made water conservation an important requirement for cities. Landscape irrigation is the largest component of
Texas single family residential (SFR) water use and is a prime subject area for conservation efforts. Conservation strategies may include water pricing, incentive programs, regulatory restrictions, and education interventions. The objective of this research was to characterize residential water use in College Station and to evaluate the conservation efficacy of three educational interventions to reduce outdoor water use; water budgets, irrigation check-ups, and the weekly watering program. Monthly water use for participants in each intervention provides the basis for analysis. Descriptive and correlational statistics were used to determine significant differences in water use after the interventions. Significand outdoor reductions were observed in 27% of the users participating in these interventions, total water savings for these users is close to 3,000,000 gallons per month. Users, for future interventions, can be selected from the groups found in this research with the largest conservation potential. Excess volume and frequency of overwatering are the key to find such users. This project provides practical opportunities based on results and a methodology that can be applied in other cities to reduce water consumption and achieve a more efficient demand management.
Advisors/Committee Members: Kaiser, Ronald (advisor), Brumbelow, Kelly (committee member), Wurbs, Ralph (committee member).
Subjects/Keywords: Outdoor water use; water conservation; users classification
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APA (6th Edition):
Bastidas Pacheco, C. J. (2018). Characterizing Residential Water Use in College Station and Assessing the Effectiveness of Educational Programs to Reduce Outdoor Water Use. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/173299
Chicago Manual of Style (16th Edition):
Bastidas Pacheco, Camilo Jose. “Characterizing Residential Water Use in College Station and Assessing the Effectiveness of Educational Programs to Reduce Outdoor Water Use.” 2018. Masters Thesis, Texas A&M University. Accessed April 13, 2021.
http://hdl.handle.net/1969.1/173299.
MLA Handbook (7th Edition):
Bastidas Pacheco, Camilo Jose. “Characterizing Residential Water Use in College Station and Assessing the Effectiveness of Educational Programs to Reduce Outdoor Water Use.” 2018. Web. 13 Apr 2021.
Vancouver:
Bastidas Pacheco CJ. Characterizing Residential Water Use in College Station and Assessing the Effectiveness of Educational Programs to Reduce Outdoor Water Use. [Internet] [Masters thesis]. Texas A&M University; 2018. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/1969.1/173299.
Council of Science Editors:
Bastidas Pacheco CJ. Characterizing Residential Water Use in College Station and Assessing the Effectiveness of Educational Programs to Reduce Outdoor Water Use. [Masters Thesis]. Texas A&M University; 2018. Available from: http://hdl.handle.net/1969.1/173299
Texas A&M University
4.
Verma, Vivek.
Comparative Analysis of Daily Flow Pattern Hydrographs Used to Disaggregate Monthly Naturalized Flows to Daily.
Degree: MS, Civil Engineering, 2017, Texas A&M University
URL: http://hdl.handle.net/1969.1/165882
► Observed and synthesized sequences of stream flow data are explored from the perspective of improving capabilities for disaggregating monthly naturalized flow volumes, representing natural undeveloped…
(more)
▼ Observed and synthesized sequences of stream flow data are explored from the perspective of improving capabilities for disaggregating monthly naturalized flow volumes, representing natural undeveloped conditions, to daily volumes. The research investigates 1) characteristics of river flows and impacts of water resources development on flows, 2) capabilities for disaggregating monthly naturalized flows to daily, and 3) the sensitivity of water availability modeling results to the daily flow pattern hydrographs adopted in monthly-to-daily naturalized flow disaggregation.
The
Texas Commission on Environmental Quality (TCEQ) Water Availability Modeling (WAM) System consists of the Water Rights Analyses Package (WRAP) and input datasets for all the river basins of
Texas. TCEQ sponsored research at
Texas A&
M University over the past several years has included development of a daily version of the monthly WRAP/WAM modeling system. The thesis research focuses on improving capabilities for developing daily pattern hydrographs for use in disaggregating monthly WAM naturalized flow sequences to daily within the daily WRAP modeling system.
Comparative statistical analyses are performed for observed and synthesized river flows at numerous gage sites in the Brazos, Trinity, Neches, and Sabine River Basins. The datasets of monthly and daily flows investigated in the thesis include observed flows at U.S. Geological Survey (USGS) gages, TCEQ WAM System naturalized flows, unregulated flows from a U.S. Army Corps of Engineers (USACE) reservoir operations modeling system, and flows generated with the Soil and Water Assessment Tool (SWAT) and Hydrologic and Water Quality System (HAWQS) watershed rainfall-runoff modeling systems. Daily WRAP simulations of the four case study river basins for a 1940-2015 hydrologic period-of-analysis are performed with alternative flow disaggregation schemes. The USACE Hydrologic Engineering Center (HEC) Data Storage System (DSS) and HEC-DSSVue are employed in the compilation and comparative analyses of datasets.
Stream flow throughout
Texas is extremely variable temporally with the extremes of floods and droughts as well as seasonal and continuous variability. The impacts of water resources development on river flows vary greatly between different locations. Impacts of upstream development are very different across the range of low to median to high flows. The HEC-DSSVue based approach for compiling, analyzing, comparing, selecting, and combining datasets significantly enhances the WRAP/WAM modeling system.
Advisors/Committee Members: Wurbs, Ralph (advisor), Gao, Huilin (committee member), Munster, Clyde (committee member).
Subjects/Keywords: comparative analysis; WRAP; WAM; flow pattern; hydrograph; disaggregation; naturalized flows; monthly to daily; river flow characteristics; water resources development; sensitivity analysis; statistical analysis; HAWQS; SWAT; HEC DSS; HEC-DSSVue; flow regime; spatial and temporal variation; floods; droughts; seasonal variation; senate bill 3; environmental flows Brazos; Trinity; Neches; Sabine; WRAP simulations; daily version; flow volumes
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APA (6th Edition):
Verma, V. (2017). Comparative Analysis of Daily Flow Pattern Hydrographs Used to Disaggregate Monthly Naturalized Flows to Daily. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/165882
Chicago Manual of Style (16th Edition):
Verma, Vivek. “Comparative Analysis of Daily Flow Pattern Hydrographs Used to Disaggregate Monthly Naturalized Flows to Daily.” 2017. Masters Thesis, Texas A&M University. Accessed April 13, 2021.
http://hdl.handle.net/1969.1/165882.
MLA Handbook (7th Edition):
Verma, Vivek. “Comparative Analysis of Daily Flow Pattern Hydrographs Used to Disaggregate Monthly Naturalized Flows to Daily.” 2017. Web. 13 Apr 2021.
Vancouver:
Verma V. Comparative Analysis of Daily Flow Pattern Hydrographs Used to Disaggregate Monthly Naturalized Flows to Daily. [Internet] [Masters thesis]. Texas A&M University; 2017. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/1969.1/165882.
Council of Science Editors:
Verma V. Comparative Analysis of Daily Flow Pattern Hydrographs Used to Disaggregate Monthly Naturalized Flows to Daily. [Masters Thesis]. Texas A&M University; 2017. Available from: http://hdl.handle.net/1969.1/165882
Texas A&M University
5.
Pauls, Mark.
Incorporating and Evaluating Environmental Instream Flows in a Priority Order Based Surface Water Allocation Model.
Degree: MS, Civil Engineering, 2014, Texas A&M University
URL: http://hdl.handle.net/1969.1/152557
► As the remaining water resources in river basins around the world are appropriated for human uses, it is critical to protect environmental instream flows in…
(more)
▼ As the remaining water resources in river basins around the world are appropriated for human uses, it is critical to protect environmental instream flows in order to preserve aquatic and riparian species and ecosystems. It is widely recognized that an adequate environmental flow regime consists of a range of flow conditions. In
Texas, a statewide planning process was established in 2007 for determining environmental flow recommendations for the state’s river basins. The environmental flow recommendations, which consist of subsistence flows, base flows, and high flow pulse events, are determined for each basin by a team of scientists and committee of stakeholders. The recommendations are considered by the
Texas Commission on Environmental Quality (TCEQ) in developing environmental flow standards which are incorporated into the state’s prior-appropriation water rights permitting system. The environmental flow standards for the Colorado River basin and Trinity River basin are incorporated in daily time-step versions of the authorized use scenario water availability models using existing and recently added features of the Water Rights Analysis Package (WRAP). Various metrics are developed by this research to characterize the degree to which the environmental flow standards are attained, given their junior position in the priority sequence. The techniques used to model instream flows in the Colorado and Trinity river basins contribute to the body of knowledge for modeling flow standards in other basins. Metrics describing the degree to which environmental flow standards are attained will assist scientists and decision-makers in the evaluation and revision of the standards.
Advisors/Committee Members: Wurbs, Ralph (advisor), Brumbelow, Kelly (committee member), Singh, Vijay (committee member).
Subjects/Keywords: environmental instream flows; environmental flow regime; environmental instream flow standards; surface water allocation model; water availability model; water rights analysis package; attainment metrics; senate bill 3; water resources planning and management
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APA (6th Edition):
Pauls, M. (2014). Incorporating and Evaluating Environmental Instream Flows in a Priority Order Based Surface Water Allocation Model. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/152557
Chicago Manual of Style (16th Edition):
Pauls, Mark. “Incorporating and Evaluating Environmental Instream Flows in a Priority Order Based Surface Water Allocation Model.” 2014. Masters Thesis, Texas A&M University. Accessed April 13, 2021.
http://hdl.handle.net/1969.1/152557.
MLA Handbook (7th Edition):
Pauls, Mark. “Incorporating and Evaluating Environmental Instream Flows in a Priority Order Based Surface Water Allocation Model.” 2014. Web. 13 Apr 2021.
Vancouver:
Pauls M. Incorporating and Evaluating Environmental Instream Flows in a Priority Order Based Surface Water Allocation Model. [Internet] [Masters thesis]. Texas A&M University; 2014. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/1969.1/152557.
Council of Science Editors:
Pauls M. Incorporating and Evaluating Environmental Instream Flows in a Priority Order Based Surface Water Allocation Model. [Masters Thesis]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/152557
Texas A&M University
6.
Siddiqui, Muhammad Abdul Raheem.
Lag and Attenuation Parameters for Routing Daily Flow Changes Through Large River Systems.
Degree: MS, Civil Engineering, 2017, Texas A&M University
URL: http://hdl.handle.net/1969.1/165891
► The 2007 Senate Bill 3 (SB3) initiated the establishment of environmental flow standards and the incorporation of them in the Water Availability Modeling System (WAM)…
(more)
▼ The 2007 Senate Bill 3 (SB3) initiated the establishment of environmental flow standards and the incorporation of them in the Water Availability Modeling System (WAM) of
Texas. This led to the creation of Water Rights Analysis Package (WRAP) daily modeling capabilities. The effects of water use and management actions propagate downstream to other locations of interest in water availability modeling over periods ranging from several hours to several days. Hence unlike the WRAP Monthly Simulation Model (SIM), the Daily Simulation Model (SIMD) includes routing of the effects of flow change events to downstream control points.
The previously developed six case study daily WAMs use routing parameters estimated through calibration using hydrographs at upstream and downstream ends of a river reach with computations performed with a genetic search algorithm. In this research, two new methods have been developed to estimate routing parameters.
1. Wave Travel Velocity Equation: Motivated by Manning’s equation and National Resources Conservation Service (NRCS) lag time equation. This equation calculates lag time based on flow, slope, and length of the reach.
2. DFLOW program: This program calculates the lag time between upstream and downstream control points for different flow change events in a time series record, and provide statistical measures of the results.
The wave travel velocity equation was applied to different reaches of the Brazos River and its tributaries and the DFLOW program was applied to the Neches, Brazos, and Trinity River Basins. Comparative analysis of different sets of routing parameters shows that lag times from the optimization-based parameters are unrealistically low for the Brazos and Neches River Basins. Lag times from DFLOW and the wave travel velocity equation are higher than optimization-based lag times and are more realistic when compared to typical average stream velocities.
Simulation results using different simulation options and routing parameters were compared to gauge the sensitivity of simulation results to different routing and forecasting options. Simulation results are sensitive to different routing parameters and routing and forecasting options but do not vary dramatically for any of these options.
Advisors/Committee Members: Wurbs, Ralph A (advisor), Munster, Clyde (advisor), Cahill, Anthony (committee member).
Subjects/Keywords: Routing; WRAP; WAM; TCEQ; Lag and Attenuation; Hydraulic Routing; Muskingum; Routing Parameters; Wave Celerity; Wave Travel Time; Daily Water Modeling
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APA (6th Edition):
Siddiqui, M. A. R. (2017). Lag and Attenuation Parameters for Routing Daily Flow Changes Through Large River Systems. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/165891
Chicago Manual of Style (16th Edition):
Siddiqui, Muhammad Abdul Raheem. “Lag and Attenuation Parameters for Routing Daily Flow Changes Through Large River Systems.” 2017. Masters Thesis, Texas A&M University. Accessed April 13, 2021.
http://hdl.handle.net/1969.1/165891.
MLA Handbook (7th Edition):
Siddiqui, Muhammad Abdul Raheem. “Lag and Attenuation Parameters for Routing Daily Flow Changes Through Large River Systems.” 2017. Web. 13 Apr 2021.
Vancouver:
Siddiqui MAR. Lag and Attenuation Parameters for Routing Daily Flow Changes Through Large River Systems. [Internet] [Masters thesis]. Texas A&M University; 2017. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/1969.1/165891.
Council of Science Editors:
Siddiqui MAR. Lag and Attenuation Parameters for Routing Daily Flow Changes Through Large River Systems. [Masters Thesis]. Texas A&M University; 2017. Available from: http://hdl.handle.net/1969.1/165891
Texas A&M University
7.
Jungman, Shannon Wynn.
Urban Water Management: Traditional and Non-Traditional Management Methods and the Effects of Advanced Meters.
Degree: MS, Civil Engineering, 2017, Texas A&M University
URL: http://hdl.handle.net/1969.1/173202
► Urban water supplies have traditionally been managed through demand side management practices such as pricing, education, legislation, technology, maintenance, and more. These practices having varying…
(more)
▼ Urban water supplies have traditionally been managed through demand side management practices such as pricing, education, legislation, technology, maintenance, and more. These practices having varying effectiveness and should be combined for greater impact. Other factors that influence consumption, such as weather patterns, attitudes toward conservation, and socio-economic factors, determine how effective demand management is. A shift in management paradigms involving treating the various sources of urban water, drinking water, wastewater, and stormwater, as a single system and using water of a quality level that matches its use is occurring to help increase the amount of water that can be conserved through management. Another change in management practices is the implementation of advanced meters which have many benefits, including reduced water consumption and detection of water theft and leaks. The use of such Advanced Metering Infrastructure (AMI) is implemented in Arlington,
Texas where having access to hourly consumption data has on the water usage of residents was observed to have slight reduction effects on the amount of water consumed by online data portal Users. These reductions varied depending on whether the consumption data was compared to the previous year or to the historical averages. This likely was influenced by vast differences in precipitation during these years. The demographic and socio-economic characteristics of the residents was examined along with the change in consumption data over of the residents who use the portal as compared with the change in consumption of those who do not. It was found that the in characteristics of the residents who used the portal were not largely different than from those that did not use the portal.
Advisors/Committee Members: Brumbelow, Kelly (advisor), Wurbs, Ralph (committee member), Cummings, Scott (committee member).
Subjects/Keywords: Advanced Metering
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APA (6th Edition):
Jungman, S. W. (2017). Urban Water Management: Traditional and Non-Traditional Management Methods and the Effects of Advanced Meters. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/173202
Chicago Manual of Style (16th Edition):
Jungman, Shannon Wynn. “Urban Water Management: Traditional and Non-Traditional Management Methods and the Effects of Advanced Meters.” 2017. Masters Thesis, Texas A&M University. Accessed April 13, 2021.
http://hdl.handle.net/1969.1/173202.
MLA Handbook (7th Edition):
Jungman, Shannon Wynn. “Urban Water Management: Traditional and Non-Traditional Management Methods and the Effects of Advanced Meters.” 2017. Web. 13 Apr 2021.
Vancouver:
Jungman SW. Urban Water Management: Traditional and Non-Traditional Management Methods and the Effects of Advanced Meters. [Internet] [Masters thesis]. Texas A&M University; 2017. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/1969.1/173202.
Council of Science Editors:
Jungman SW. Urban Water Management: Traditional and Non-Traditional Management Methods and the Effects of Advanced Meters. [Masters Thesis]. Texas A&M University; 2017. Available from: http://hdl.handle.net/1969.1/173202
Texas A&M University
8.
Hoffpauir, Richard James.
Daily Time Step Simulation with a Priority Order Based Surface Water Allocation Model.
Degree: PhD, Civil Engineering, 2011, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8703
► Surface water availability models often use monthly simulation time steps for reasons of data availability, model parameter parsimony, and reduced computational time. Representing realistic streamflow…
(more)
▼ Surface water availability models often use monthly simulation time
steps for reasons of data availability, model parameter parsimony, and reduced
computational time. Representing realistic streamflow variability, however,
requires modeling time steps with sub-monthly or daily temporal resolution.
Adding daily time step simulation capability to the Water Rights Analysis
Package (WRAP) and the
Texas Water Availability Modeling (WAM) System is
a growing area of need and interest in water rights permitting, water supply
planning, and environmental protection.
This research consisted of the following tasks:
1. Key modeling issues are identified that are relevant to daily time step
modeling, but are otherwise not considered with monthly
simulations. These key modeling issues include disaggregating
monthly naturalized flows into daily flows, routing changes to flow
through the stream network, reducing impacts to water availability in
a priority order based water right system through the use of
streamflow forecasting, distributing water right targets from monthly to daily amounts, and integrating flood control reservoir operations
into the existing conservation reservoir modeling framework.
2. Two new programs for WRAP are developed to address the key daily
time step modeling issues. The new programs include a pre-processor
program, DAY, and a daily simulation program, SIMD.
3. A case study of the Brazos River Basin WAM is presented using daily
time steps with SIMD. The purpose of the case study is to present an
implementation of the daily modeling capabilities.
4. The case study simulation results are used as a basis to draw
conclusions regarding monthly versus daily simulation outcomes.
The research, as presented through the Brazos River Basin WAM case
study, illustrated that incorporating realistic daily streamflow variability into
the simulation of a priority order based water allocation system can
substantially affect the results obtained for time series of critical period reservoir
storage contents, the determination of long-term water right reliability, and the
distribution of unappropriated and regulated flows. The modeling capabilities
developed by this research advance the state of water availability modeling with
sub-monthly time steps by addressing the key modeling issues related to
streamflow variability and routing.
Advisors/Committee Members: Wurbs, Ralph A. (advisor), Cahill, Anthony (committee member), Olivera, Francisco (committee member), Klein, Andrew (committee member).
Subjects/Keywords: water availability; prior appropriation; water right; reservoir; simulation; time step; monthly; daily
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APA (6th Edition):
Hoffpauir, R. J. (2011). Daily Time Step Simulation with a Priority Order Based Surface Water Allocation Model. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8703
Chicago Manual of Style (16th Edition):
Hoffpauir, Richard James. “Daily Time Step Simulation with a Priority Order Based Surface Water Allocation Model.” 2011. Doctoral Dissertation, Texas A&M University. Accessed April 13, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8703.
MLA Handbook (7th Edition):
Hoffpauir, Richard James. “Daily Time Step Simulation with a Priority Order Based Surface Water Allocation Model.” 2011. Web. 13 Apr 2021.
Vancouver:
Hoffpauir RJ. Daily Time Step Simulation with a Priority Order Based Surface Water Allocation Model. [Internet] [Doctoral dissertation]. Texas A&M University; 2011. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8703.
Council of Science Editors:
Hoffpauir RJ. Daily Time Step Simulation with a Priority Order Based Surface Water Allocation Model. [Doctoral Dissertation]. Texas A&M University; 2011. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8703
Texas A&M University
9.
Cui, Huijuan.
Estimation of Velocity Distribution and Suspended Sediment Discharge in Open Channels Using Entropy.
Degree: MS, Water Management and Hydrological Science, 2011, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9325
► In hydraulics, velocity distribution is needed to determine flow characteristics, like discharge, sediment discharge, head loss, energy coefficient, moment coefficient, and scour. However, the complicated…
(more)
▼ In hydraulics, velocity distribution is needed to determine flow characteristics, like discharge, sediment discharge, head loss, energy coefficient, moment coefficient, and scour. However, the complicated interaction between water and sediment causes great difficulties in the measurement of flow and sediment discharge. Thus, the development of a method which can simulate the velocity distribution and sediment discharge in open channels is designable.
Traditional methods for the estimation of velocity distribution, such as the Prandtl-von Karman logarithmic velocity and of sediment concentration distribution, such as the Rouse equation, are generally invalid at or near the channel bed and are inaccurate at the water surface. Considering the limitations of traditional methods, entropy based models have been applied, yet the assumption on the cumulative distribution function made in these methods limits their application.
The objective of this research is to develop an efficient method to estimate velocity distribution and suspended sediment discharge in open channels using the Tsallis entropy. This research focuses on a better-organized hypothesis on the cumulative probability distribution function under more applicable coordinates, which should be transformable in different dimensions.
Velocity distribution and sediment distribution are derived using the Tsallis entropy under the hypothesis that the cumulative probability distribution follows a non-linear function, in which the value of the exponent is shown to be related to the width-depth ratio of channel cross-section. Three different combinations of entropy and empirical methods for velocity and sediment concentration distribution are applied to compute suspended sediment discharge. Then advantages and disadvantages of each method are discussed.
The velocity distribution derived using the Tsallis entropy is expected to be easy to apply and valid throughout the whole cross-section of the open channel. This research contributes to the application of entropy theory and shows its advantages in hydraulic engineering.
Advisors/Committee Members: Singh, Vijay P. (advisor), Wurbs, Ralph A. (committee member), Cline, Daren B. (committee member).
Subjects/Keywords: entropy; velocity; suspended sediment discharge
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APA (6th Edition):
Cui, H. (2011). Estimation of Velocity Distribution and Suspended Sediment Discharge in Open Channels Using Entropy. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9325
Chicago Manual of Style (16th Edition):
Cui, Huijuan. “Estimation of Velocity Distribution and Suspended Sediment Discharge in Open Channels Using Entropy.” 2011. Masters Thesis, Texas A&M University. Accessed April 13, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9325.
MLA Handbook (7th Edition):
Cui, Huijuan. “Estimation of Velocity Distribution and Suspended Sediment Discharge in Open Channels Using Entropy.” 2011. Web. 13 Apr 2021.
Vancouver:
Cui H. Estimation of Velocity Distribution and Suspended Sediment Discharge in Open Channels Using Entropy. [Internet] [Masters thesis]. Texas A&M University; 2011. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9325.
Council of Science Editors:
Cui H. Estimation of Velocity Distribution and Suspended Sediment Discharge in Open Channels Using Entropy. [Masters Thesis]. Texas A&M University; 2011. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9325
Texas A&M University
10.
Huang, Chi-Ying.
An Economic Analysis of Stream Restoration in an Urban Watershed: Austin, Texas.
Degree: MS, Water Management and Hydrological Science, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10736
► By 2006, the U.S. government has spent $15 billion to address the degradation of urban streams, including erosion of stream banks, disconnection of rivers from…
(more)
▼ By 2006, the U.S. government has spent $15 billion to address the degradation of urban streams, including erosion of stream banks, disconnection of rivers from the floodplain, and disturbance of surface runoff pathways. Bank stabilization is one of the most prevalent restoration activities in urban stream restoration. Unfortunately, most stream restoration projects have been undertaken without a pre- or post-evaluation of the impact of stream restoration on real value in the area. All restoration projects beg the question: Did the money spent on the project result in greater benefits to stream stability as well as to adjacent properties? The Walnut Creek watershed, located in Austin,
Texas, has experienced varying stages of urbanization since the 1990s. One of the streams, the Walnut Creek tributary, was restored in 2003. The purpose of this study is to assess the impact of stream restoration on housing values. We applied the hedonic pricing method to evaluate the changes in housing value associated with housing and environmental characteristics. Repeat ground photography was utilized to assess stream restoration activities at spatial and temporal scales. Our results suggest that the stream restoration project resulted in significant positive impacts on housing values in the periods of restoration (8.3%) and restoration adjustment (10.7%). However, the project did not enhance the values of houses on the floodplain. In addition, results show that erosion had continuous negative impacts on housing values. Overall, the restoration project contributed to the greater benefits during the restoration adjustment period right after restoration by an increase of 1% of the average housing value for each property on the restoration site. In this study, the benefits of stream restoration project were minimal since bank stabilization was the main activity considered in this stream restoration project. Nevertheless, restoration enhances the stability of the stream banks, minimizes erosion problems, and presents an enhanced aesthetic beauty of the stream in Austin,
Texas.
Advisors/Committee Members: Giardino, John R. (advisor), Coulson, Robert (committee member), Wurbs, Ralph (committee member).
Subjects/Keywords: stream restoration; bank stabilization; hedonic pricing method; repeat ground photography.
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APA (6th Edition):
Huang, C. (2012). An Economic Analysis of Stream Restoration in an Urban Watershed: Austin, Texas. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10736
Chicago Manual of Style (16th Edition):
Huang, Chi-Ying. “An Economic Analysis of Stream Restoration in an Urban Watershed: Austin, Texas.” 2012. Masters Thesis, Texas A&M University. Accessed April 13, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10736.
MLA Handbook (7th Edition):
Huang, Chi-Ying. “An Economic Analysis of Stream Restoration in an Urban Watershed: Austin, Texas.” 2012. Web. 13 Apr 2021.
Vancouver:
Huang C. An Economic Analysis of Stream Restoration in an Urban Watershed: Austin, Texas. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10736.
Council of Science Editors:
Huang C. An Economic Analysis of Stream Restoration in an Urban Watershed: Austin, Texas. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10736
Texas A&M University
11.
Karimov, Askarali Khuramovich.
Water Availability Modeling to Support Water Management in the Lower Rio Grande Valley of Texas.
Degree: PhD, Water Management and Hydrological Science, 2016, Texas A&M University
URL: http://hdl.handle.net/1969.1/159016
► The Rio Grande River is considered as an over-appropriated river basin in Texas, where the number of permits to use surface waters exceed the amount…
(more)
▼ The Rio Grande River is considered as an over-appropriated river basin in
Texas, where the number of permits to use surface waters exceed the amount of available water. Agricultural and municipal water supply and use in the Lower Rio Grande Valley (LRGV) are essentially dependent upon storage of the International Amistad and Falcon Reservoirs, which are owned and operated by the International Boundary and Water Commission (IBCW) based on provisions of the 1944 treaty between Mexico and the United States. The
Texas share of the waters of the Rio Grande is allocated among numerous farmers, irrigation districts, and cities by a unique water rights permit system administered by the Rio Grande watermaster of the
Texas Commission on Environmental Quality (TCEQ). The Rio Grande Water Availability Model (WAM) obtained from the TCEQ WAM System has a hydrologic period-of-analysis of 1940-2000. However, hydrology since 2000 includes the severe 2008-2014 drought and is important to the simulation study. The hydrologic period of analysis for the Rio Grande WAM was extended from 2001 to 2015 using Water Rights Analyses Package (WRAP) programs and methodologies. Extending the hydrologic period-of-analysis of the Rio Grande WAM to cover 1940-2015 was an initial major task in the research.
A WRAP/WAM simulation combines natural hydrology represented by sequences of monthly naturalized streamflows and reservoir evaporation-precipitation rates for a specified hydrologic period-of-analysis, 1940-2015 in this study, with specified scenarios of water resources development, allocation, management, and use. Water availability is assessed based on supply reliability metrics and storage and flow frequency metrics computed from simulation results.
Additionally, the Rio Grande WAM original 1940-2000 hydrologic period of analysis is extended to cover 1940-2015 and long-term simulations were performed to develop water supply reliability and storage frequency metrics for major water right groups, reallocation of municipal water rights in the Amistad-Falcon Reservoir system, and water planning scenarios including drought management. The Conditional Reliability Modeling (CRM) methods were applied to assess short-term water planning and management strategies for the LRGV along with the drought management scenarios were simulated to predict the likelihood of extended drought conditions based on beginning storage in the Amistad-Falcon Reservoir system. The reliability and exceedance frequencies of maximum end-of-month storage at Amistad and Falcon reservoirs were developed using CRM.
Advisors/Committee Members: Wurbs, Ralph (advisor), Smith, Patricia (advisor), Enciso, Juan (committee member), Kaiser, Ronald (committee member).
Subjects/Keywords: Water Availability Modeling; Streamflow and Reservoir Simulations
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APA (6th Edition):
Karimov, A. K. (2016). Water Availability Modeling to Support Water Management in the Lower Rio Grande Valley of Texas. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/159016
Chicago Manual of Style (16th Edition):
Karimov, Askarali Khuramovich. “Water Availability Modeling to Support Water Management in the Lower Rio Grande Valley of Texas.” 2016. Doctoral Dissertation, Texas A&M University. Accessed April 13, 2021.
http://hdl.handle.net/1969.1/159016.
MLA Handbook (7th Edition):
Karimov, Askarali Khuramovich. “Water Availability Modeling to Support Water Management in the Lower Rio Grande Valley of Texas.” 2016. Web. 13 Apr 2021.
Vancouver:
Karimov AK. Water Availability Modeling to Support Water Management in the Lower Rio Grande Valley of Texas. [Internet] [Doctoral dissertation]. Texas A&M University; 2016. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/1969.1/159016.
Council of Science Editors:
Karimov AK. Water Availability Modeling to Support Water Management in the Lower Rio Grande Valley of Texas. [Doctoral Dissertation]. Texas A&M University; 2016. Available from: http://hdl.handle.net/1969.1/159016
Texas A&M University
12.
Yildirim, Gokhan.
Spatial Drought Risk Assessment Using Standardized Precipitation Index and Effective Drought Index: Edwards Aquifer Region.
Degree: MS, Biological and Agricultural Engineering, 2015, Texas A&M University
URL: http://hdl.handle.net/1969.1/154966
► Though drought is a recurrent natural disaster in Texas, little attention has been so far paid to the preparedness of drought for spatial drought risk…
(more)
▼ Though drought is a recurrent natural disaster in
Texas, little attention has been so far paid to the preparedness of drought for spatial drought risk assessment. This study presents a methodology for spatial assessment of drought hazard, vulnerability, and risk in the Edwards Aquifer (EA) region. A conceptual data-based framework for drought hazard and vulnerability was developed in this study. Standardized Precipitation Index (SPI) and Effective Drought Index (EDI) methods were used to identify Drought Hazard Index (DHI) in different time steps, while the GIS environment was used to map the spatial extents of drought hazards. Drought Vulnerability Index (DVI) was identified by using different social and physical consequences of drought and a thematic map was prepared on the county level for vulnerability assessment. The risk, as a result, was computed as the product of intersection between both the DHI and DVI. Very high drought risk was found by 9 and 24-month SPI and EDI in Bexar (9.8% of the area). The highest percentage of the area in high level drought risk was detected by 1 and 12-month SPI as 32.3% of the area and 3-mont SPI found the highest moderate percentage of the area (79.5%). Bexar was found under drought risk based on all time scale SPI and EDI (very high drought risk based on 9, 24-month SPIs and EDI). Medina, furthermore, was detected in high drought risk in terms of all time scale SPI (except 3-month SPI) and EDI. In general, drought risk is higher in counties of the southern part of the area. The results confirmed that higher drought risks are found where both high hazard and high vulnerability coincide.
Advisors/Committee Members: Singh, Vijay P. (advisor), Karthikeyan, Raghupathy (committee member), Wurbs, Ralph A. (committee member).
Subjects/Keywords: drought hazard; drought risk assessment
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APA (6th Edition):
Yildirim, G. (2015). Spatial Drought Risk Assessment Using Standardized Precipitation Index and Effective Drought Index: Edwards Aquifer Region. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/154966
Chicago Manual of Style (16th Edition):
Yildirim, Gokhan. “Spatial Drought Risk Assessment Using Standardized Precipitation Index and Effective Drought Index: Edwards Aquifer Region.” 2015. Masters Thesis, Texas A&M University. Accessed April 13, 2021.
http://hdl.handle.net/1969.1/154966.
MLA Handbook (7th Edition):
Yildirim, Gokhan. “Spatial Drought Risk Assessment Using Standardized Precipitation Index and Effective Drought Index: Edwards Aquifer Region.” 2015. Web. 13 Apr 2021.
Vancouver:
Yildirim G. Spatial Drought Risk Assessment Using Standardized Precipitation Index and Effective Drought Index: Edwards Aquifer Region. [Internet] [Masters thesis]. Texas A&M University; 2015. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/1969.1/154966.
Council of Science Editors:
Yildirim G. Spatial Drought Risk Assessment Using Standardized Precipitation Index and Effective Drought Index: Edwards Aquifer Region. [Masters Thesis]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/154966
Texas A&M University
13.
Kim, Zooho.
Assesment of Riverbed Change Due to the Operation of a Series of Gates in a Natural River.
Degree: MS, Biological and Agricultural Engineering, 2013, Texas A&M University
URL: http://hdl.handle.net/1969.1/149327
► Changes in the bed of Geum River (L=130 km from Daechung regulation dam to Geum River estuarial bank) in South Korea were predicted using the…
(more)
▼ Changes in the bed of Geum River (L=130 km from Daechung regulation dam to Geum River estuarial bank) in South Korea were predicted using the 1-D HEC-RAS model and the 2-D CCHE2D model. Three movable weirs have been installed and dredging has been carried out in Geum River under the Four Major Rivers Restoration Project (2009-2012).
Inflow data of sub basins were calibrated with daily runoff data generated by PRMS based on a hydrologic unit map. To determine the gate opening height for maintaining the management water level, unsteady analysis was performed using HEC-RAS. Thereafter, long-term riverbed changes through quasi-unsteady analysis were simulated for 20 years. In order to investigate the effect of movable weirs, sediment analysis was done for three cases of gate opening: case 1 is fully close, case 2 is fully open, and case 3 is regulating gates by the operating rule. Also, short-term riverbed changes were predicted with CCHE2D for 11 days in the problem area, depending on the results of 1-D model, and the effect of dikes was examined.
In future, gate operation and structural methods such as dikes must be in step with each other in order to manage sediment and rivers in an ecofriendly manner.
Advisors/Committee Members: Singh, Vijay P. (advisor), Wurbs, Ralph A. (committee member), Smith, Patricia K. (committee member).
Subjects/Keywords: Gates; Series of gates; Gate operation; Riverbed change; Movable weir
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APA (6th Edition):
Kim, Z. (2013). Assesment of Riverbed Change Due to the Operation of a Series of Gates in a Natural River. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/149327
Chicago Manual of Style (16th Edition):
Kim, Zooho. “Assesment of Riverbed Change Due to the Operation of a Series of Gates in a Natural River.” 2013. Masters Thesis, Texas A&M University. Accessed April 13, 2021.
http://hdl.handle.net/1969.1/149327.
MLA Handbook (7th Edition):
Kim, Zooho. “Assesment of Riverbed Change Due to the Operation of a Series of Gates in a Natural River.” 2013. Web. 13 Apr 2021.
Vancouver:
Kim Z. Assesment of Riverbed Change Due to the Operation of a Series of Gates in a Natural River. [Internet] [Masters thesis]. Texas A&M University; 2013. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/1969.1/149327.
Council of Science Editors:
Kim Z. Assesment of Riverbed Change Due to the Operation of a Series of Gates in a Natural River. [Masters Thesis]. Texas A&M University; 2013. Available from: http://hdl.handle.net/1969.1/149327
Texas A&M University
14.
Schnier, Spencer Thomas.
Issues in Assessing Short-Term Water Supply Capabilities of Reservoir Systems.
Degree: MS, Civil Engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7804
► The Texas Commission on Environmental Quality (TCEQ) uses a Water Availability Modeling System (WAM) to support long-term regional and statewide water resources planning and management.…
(more)
▼ The
Texas Commission on Environmental Quality (TCEQ) uses a Water Availability Modeling System (WAM) to support long-term regional and statewide water resources planning and management. The water availability studies are based on the modeling capabilities of the Water Rights Analysis Package (WRAP). This research improves the understanding of decision support tools for short-term river basin management. Current reservoir storage levels must be considered to assess short-term frequencies and reliabilities. Conditional reliability modeling (CRM) is used to assess the likelihood of meeting targets for instream flow, reservoir storage, water supply diversion and hydroelectric power generation in the near future (next month to next several years), conditioned upon preceding storage. This study uses data for the Brazos River Basin from the TCEQ WAM System to assess key complexities of water supply reliability analysis in general and conditional reliability modeling in particular. These complexities include uncertainties associated with river basin hydrology, estimating yield-reliability relationships for individual reservoirs and multiple reservoir systems, conventional long-term planning versus short-term adaptive management and other modeling and analysis issues. The modeling capabilities of WRAP were expanded to support near real-time operation of dams under various stream flow conditions. The sensitivity to changes in modeling options is assessed for short and long-term simulations. Traditional and newly developed methodologies for estimating firm yields and water supply reliabilities are evaluated. Guidelines are developed regarding the practical application of firm yield analyses and conditional reliability modeling. Important applications of this research include real-time decision support during drought and routinely recurring operational planning activities. A case study of the drought of 2009 uses the CRM features of WRAP for these applications.
Advisors/Committee Members: Wurbs, Ralph (advisor), Olivera, Francisco (committee member), Boulanger, Bryan (committee member), Srinivasan, Raghavan (committee member).
Subjects/Keywords: Conditional Probability; Short-Range Reliability; Reservoirs; Water Resources Planning
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Export
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APA (6th Edition):
Schnier, S. T. (2012). Issues in Assessing Short-Term Water Supply Capabilities of Reservoir Systems. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7804
Chicago Manual of Style (16th Edition):
Schnier, Spencer Thomas. “Issues in Assessing Short-Term Water Supply Capabilities of Reservoir Systems.” 2012. Masters Thesis, Texas A&M University. Accessed April 13, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7804.
MLA Handbook (7th Edition):
Schnier, Spencer Thomas. “Issues in Assessing Short-Term Water Supply Capabilities of Reservoir Systems.” 2012. Web. 13 Apr 2021.
Vancouver:
Schnier ST. Issues in Assessing Short-Term Water Supply Capabilities of Reservoir Systems. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7804.
Council of Science Editors:
Schnier ST. Issues in Assessing Short-Term Water Supply Capabilities of Reservoir Systems. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7804
Texas A&M University
15.
Kanta, Lufthansa Rahman.
A Risk-based Optimization Modeling Framework for Mitigating Fire Events for Water and Fire Response Infrastructures.
Degree: PhD, Civil Engineering, 2011, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7367
► The purpose of this dissertation is to address risk and consequences of and effective mitigation strategies for urban fire events involving two critical infrastructures- water…
(more)
▼ The purpose of this dissertation is to address risk and consequences of and effective mitigation strategies for urban fire events involving two critical infrastructures- water distribution and emergency services. Water systems have been identified as one of the United States' critical infrastructures and are vulnerable to various threats caused by natural disasters or malevolent actions. The primary goals of urban water distribution systems are reliable delivery of water during normal and emergency conditions (such as fires), ensuring this water is of acceptable quality, and accomplishing these tasks in a cost-effective manner. Due to interdependency of water systems with other critical infrastructures-e.g., energy, public health, and emergency services (including fire response)- water systems planning and management offers numerous challenges to water utilities and affiliated decision makers.
The dissertation is divided into three major sections, each of which presents and demonstrates a methodological innovation applied to the above problem. First, a risk based dynamic programming modeling approach is developed to identify the critical components of a water distribution system during fire events under three failure scenarios: (1) accidental failure due to soil-pipe interaction, (2) accidental failure due to a seismic activity, and (3) intentional failure or malevolent attack. Second, a novel evolutionary computation based multi-objective optimization technique, Non-dominated Sorting Evolution Strategy (NSES), is developed for systematic generation of optimal mitigation strategies for urban fire events for water distribution systems with three competing objectives: (1) minimizing fire damages, (2) minimizing water quality deficiencies, and (3) minimizing the cost of mitigation. Third, a stochastic modeling approach is developed to assess urban fire risk for the coupled water distribution and fire response systems that includes probabilistic expressions for building ignition, WDS failure, and wind direction. Urban fire consequences are evaluated in terms of number of people displaced and cost of property damage. To reduce the assessed urban fire risk, the NSES multi-objective approach is utilized to generate Pareto-optimal solutions that express the tradeoff relationship between risk reduction, mitigation cost, and water quality objectives. The new methodologies are demonstrated through successful application to a realistic case study in water systems planning and management.
Advisors/Committee Members: Brumbelow, Kelly (advisor), Zechman, Emily M. (advisor), Wurbs, Ralph A. (committee member), Butenko, Sergiy (committee member).
Subjects/Keywords: Risk Assessment; Dynamic Programming; Multi-objective Optimization; Evolutionary Computation based Algorithms; Hazard Mitigation; Urban Fire Risk; Water Distribution
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APA ·
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Export
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APA (6th Edition):
Kanta, L. R. (2011). A Risk-based Optimization Modeling Framework for Mitigating Fire Events for Water and Fire Response Infrastructures. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7367
Chicago Manual of Style (16th Edition):
Kanta, Lufthansa Rahman. “A Risk-based Optimization Modeling Framework for Mitigating Fire Events for Water and Fire Response Infrastructures.” 2011. Doctoral Dissertation, Texas A&M University. Accessed April 13, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7367.
MLA Handbook (7th Edition):
Kanta, Lufthansa Rahman. “A Risk-based Optimization Modeling Framework for Mitigating Fire Events for Water and Fire Response Infrastructures.” 2011. Web. 13 Apr 2021.
Vancouver:
Kanta LR. A Risk-based Optimization Modeling Framework for Mitigating Fire Events for Water and Fire Response Infrastructures. [Internet] [Doctoral dissertation]. Texas A&M University; 2011. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7367.
Council of Science Editors:
Kanta LR. A Risk-based Optimization Modeling Framework for Mitigating Fire Events for Water and Fire Response Infrastructures. [Doctoral Dissertation]. Texas A&M University; 2011. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7367
Texas A&M University
16.
Kim, Dong Kyun.
Study on Poisson Cluster Stochastic Rainfall Generators.
Degree: PhD, Civil Engineering, 2011, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7387
► The purpose of this dissertation is to enhance the applicability and the accuracy of the Poisson cluster stochastic rainfall generators. Firstly, the 6 parameters of…
(more)
▼ The purpose of this dissertation is to enhance the applicability and the accuracy
of the Poisson cluster stochastic rainfall generators.
Firstly, the 6 parameters of the Modified Bartlett-Lewis Rectangular Pulse
(MBLRP) stochastic rainfall simulation model were regionalized across the contiguous
United States. Each of the parameters of MBLRP model estimated at 3,444 National
Climate Data Center (NCDC) rain gages was spatially interpolated based on the
Ordinary Kriging technique to produce the parameter surface map for each of the 12
months of the year. Cross-validation was used to assess the validity of the parameter
maps. The results indicate that the suggested maps reproduce well the statistics of the
observed rainfall for different accumulation intervals, except for the lag-1
autocorrelation coefficient. The estimated parameter values were also used to produce
the maps of storm and rain cell characteristics.
Secondly, the relative importance of the rainfall statistics in the generation of
watershed response characteristics was estimated based on regression analyses using the
rainfall time series observed at 1099 NCDC rain gages. The result of the analyses was
used to weigh the rainfall statistics differently in the parameter calibration process of MBLRP model. It was observed that synthetic rainfall time series generated weighing
the precipitation statistics according to their relative importance outperformed those
generated weighing all statistics equally in predicting watershed runoff depths and peak
flows. When all statistics were given the same weight, runoff depths and peak flows
were underestimated by 20 percent and 14 percent, respectively; while, when the statistics were
weighed proportionally to their relative importance, the underestimation was reduced to
4 percent and 3 percent, which confirms the advantage of weighing the statistics differently. In
general, the value of the weights depends on the hydrologic process being modeled.
Lastly, a stochastic rainfall generation model that can integrate year-to-year
variability of rainfall statistics is suggested. The new framework consists of two parts.
The first part generates the short-term rainfall statistics based on the correlation between
the observed rainfall statistics. The second part generates the rainfall time series using
the modified Bartlett-Lewis rectangular pulse model based on the simulated rainfall
statistics. The new approach was validated at 104 NCDC gages across the United States
in its ability to reproduce rainfall and watershed response characteristics. The result
indicates that the new framework outperformed the traditional approach in reproducing
the distribution of monthly maximum rainfall depths, monthly runoff volumes and
monthly peak flows.
Advisors/Committee Members: Olivera, Francisco (advisor), Wurbs, Ralph (committee member), Socolofsky, Scott (committee member), Li, Ming-han (committee member).
Subjects/Keywords: Rainfall; Precipitation; Stochastic; Generator; Poisson; cluster
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APA (6th Edition):
Kim, D. K. (2011). Study on Poisson Cluster Stochastic Rainfall Generators. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7387
Chicago Manual of Style (16th Edition):
Kim, Dong Kyun. “Study on Poisson Cluster Stochastic Rainfall Generators.” 2011. Doctoral Dissertation, Texas A&M University. Accessed April 13, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7387.
MLA Handbook (7th Edition):
Kim, Dong Kyun. “Study on Poisson Cluster Stochastic Rainfall Generators.” 2011. Web. 13 Apr 2021.
Vancouver:
Kim DK. Study on Poisson Cluster Stochastic Rainfall Generators. [Internet] [Doctoral dissertation]. Texas A&M University; 2011. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7387.
Council of Science Editors:
Kim DK. Study on Poisson Cluster Stochastic Rainfall Generators. [Doctoral Dissertation]. Texas A&M University; 2011. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7387
Texas A&M University
17.
Demirel, Mustafa.
Assessment of Flood Control Capabilities for Alternative Reservoir Storage Allocations.
Degree: MS, Civil Engineering, 2015, Texas A&M University
URL: http://hdl.handle.net/1969.1/155386
► Reservoir operation and storage allocation are important duties for agencies and water management professionals in Texas and elsewhere responsible for supplying water for municipal, industrial,…
(more)
▼ Reservoir operation and storage allocation are important duties for agencies and water management professionals in
Texas and elsewhere responsible for supplying water for municipal, industrial, and agricultural uses, hydroelectric power generation, recreation, navigation, and maintenance of instream flow for fish and wildlife, and protecting human lives and properties from flooding. Flood control capabilities for alternative reservoir storage allocations are assessed in the thesis research using the Water Rights Analysis Package (WRAP) with a daily version of the WRAP input dataset for the Trinity River Basin from the
Texas Water Availability Modeling (WAM) System expanded to incorporate flood control operations. Tradeoffs between flood control and water supply in multiple-purpose reservoirs are analyzed. A system of eight multiple-purpose reservoirs operated by the United States Army Corps of Engineers (USACE) in the Trinity River Basin serves as a case study for this research.
WRAP/WAM capabilities for simulating reservoir system operations for flood control were tested and improved. Frequency analyses of maximum annual storage levels were performed for both actual observed storage and storage computed by the simulation model for alternative modeling premises and reservoir operating strategies. The frequency analyses focused on determining the probability of exceeding flood control storage capacities. The Hydrologic Engineering Center (HEC) Statistical Software Package (SSP) was used to apply the log-normal and log-Pearson type III probability distribution functions. Various issues in simulating multiple-purpose reservoir systems and performing storage frequency analyses were investigated.
Reallocations of storage capacity in the eight reservoirs from water supply to flood control can be implemented by raising the designated top of conservation pool. Impacts on flood control are evaluated in this study in terms of probability of overtopping the flood control pool. Impacts on water supply are quantified based on changes in reliability metrics.
Alternative nine simulations are performed in WRAP for the eight Trinity River Basin Reservoirs. Three of the nine simulations are reallocation of storage capacities from flood control pool to conservation pool. Storage capacities, flood frequency analyses, and water supply reliabilities are compared and assessed for both actual observed storage capacities and simulation results.
Advisors/Committee Members: Wurbs, Ralph A (advisor), Cahill, Anthony T (committee member), Munster, Clyde L (committee member).
Subjects/Keywords: Flood operation; WRAP flood control; Flood frequency analysis
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APA (6th Edition):
Demirel, M. (2015). Assessment of Flood Control Capabilities for Alternative Reservoir Storage Allocations. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/155386
Chicago Manual of Style (16th Edition):
Demirel, Mustafa. “Assessment of Flood Control Capabilities for Alternative Reservoir Storage Allocations.” 2015. Masters Thesis, Texas A&M University. Accessed April 13, 2021.
http://hdl.handle.net/1969.1/155386.
MLA Handbook (7th Edition):
Demirel, Mustafa. “Assessment of Flood Control Capabilities for Alternative Reservoir Storage Allocations.” 2015. Web. 13 Apr 2021.
Vancouver:
Demirel M. Assessment of Flood Control Capabilities for Alternative Reservoir Storage Allocations. [Internet] [Masters thesis]. Texas A&M University; 2015. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/1969.1/155386.
Council of Science Editors:
Demirel M. Assessment of Flood Control Capabilities for Alternative Reservoir Storage Allocations. [Masters Thesis]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/155386
Texas A&M University
18.
Bista, Ankit.
River/Reservoir System Water Availability Modeling Support for Drought Management.
Degree: MS, Civil Engineering, 2015, Texas A&M University
URL: http://hdl.handle.net/1969.1/155724
► The Water Availability Modeling (WAM) System maintained by the Texas Commission on Environmental Quality (TCEQ) consists of the Water Rights Analysis Package (WRAP) and datasets…
(more)
▼ The Water Availability Modeling (WAM) System maintained by the
Texas Commission on Environmental Quality (TCEQ) consists of the Water Rights Analysis Package (WRAP) and datasets for all the river basins of
Texas. The modeling system is used to support long-term regional and statewide planning and evaluation of water right permit applications. The research is designed to explore and improve WRAP/WAM capabilities as a decision-support tool for drought management.
The WRAP/WAM model for the Colorado River Basin is applied in this research in both long-term planning and short-term conditional reliability modeling (CRM) modes. A strategy using iterative long-term simulations is developed for modeling water management plans that combine interruptible and firm water supply commitments. The methodology is tested and demonstrated by application to the LCRA System. Improvements in water supply reliabilities provided by off-channel storage are also investigated in the simulation study. The research is designed to explore and improve modeling capabilities in general, not to support specific decisions regarding water management in this particular river basin.
CRM features in WRAP provide short-term storage frequency and supply reliability analyses conditioned on preceding reservoir storage and can be employed as a decision-support tool for water management during drought or operational planning studies for preparing for future drought. The research explores alternative methods and combinations of options for performing various CRM tasks and develops several additional new options.
Climate teleconnection patterns, drought indices, and flow persistence are investigated from the perspective of potential improvements to WRAP/WAM CRM capabilities. The literature regarding climate cycles and metrics for identifying these cycles is reviewed. Correlation analyses are performed to analyze the relationship between flows at selected sites on the Colorado River and various climate cycle indices. The correlations are generally found to be fairly weak.
The Rapid Intervention Program (RIP) is designed for improving on-farm irrigation management strategies. A new interactive web interface tool being developed by other researchers at
Texas A&
M University, called the Irrigation Water-Use Efficiency Maximizer (IWEM), will link WRAP with RIP. WRAP CRM methods are tested and compared to determine the optimal combination of options for use with the IWEM platform.
Advisors/Committee Members: Wurbs, Ralph A (advisor), Cahill, Anthony T (committee member), Singh, Vijay P (committee member).
Subjects/Keywords: Drought Managment; Conditional Reliability Modeling
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APA (6th Edition):
Bista, A. (2015). River/Reservoir System Water Availability Modeling Support for Drought Management. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/155724
Chicago Manual of Style (16th Edition):
Bista, Ankit. “River/Reservoir System Water Availability Modeling Support for Drought Management.” 2015. Masters Thesis, Texas A&M University. Accessed April 13, 2021.
http://hdl.handle.net/1969.1/155724.
MLA Handbook (7th Edition):
Bista, Ankit. “River/Reservoir System Water Availability Modeling Support for Drought Management.” 2015. Web. 13 Apr 2021.
Vancouver:
Bista A. River/Reservoir System Water Availability Modeling Support for Drought Management. [Internet] [Masters thesis]. Texas A&M University; 2015. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/1969.1/155724.
Council of Science Editors:
Bista A. River/Reservoir System Water Availability Modeling Support for Drought Management. [Masters Thesis]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/155724
Texas A&M University
19.
Faloon, Anna Elizabeth.
Adapting to Hydrologic Nonstationarity in Engineering Design.
Degree: PhD, Civil Engineering, 2015, Texas A&M University
URL: http://hdl.handle.net/1969.1/156295
► The engineering design discipline of hydrology and hydraulics has, for the past several decades, been largely based on probabilistic design techniques involving recurrence interval storm…
(more)
▼ The engineering design discipline of hydrology and hydraulics has, for the past several decades, been largely based on probabilistic design techniques involving recurrence interval storm and flood events. The engineering design storm and design flood have been enduring concepts; however, recently the concept of hydrologic nonstationarity has gained a foothold in engineering theory.
An analysis of the annual maxima based method of predicting engineering design storms was conducted using multiple techniques to determine whether trends were detectable or prevalent. Analyses from over 300 rain gauge stations throughout the southeastern United States showed that over 40% had experienced some form of trending behavior over time. An analysis of tropical storm contributions to station annual maxima found that such events were not overly influential with regard to extreme event prediction. Furthermore, spatial trends were not detected. These findings showed that the engineering design storm is affected by hydrologic nonstationarity.
This research also investigated several other sources of hydrologic nonstationarity – specifically, contributions from rapid urbanization, topographic subsidence, and engineering design decisions. Changes in engineering design flows from urbanization result in designs that are quickly obsolete and prone to inundation. The decisions of a design engineer can result in design flows vastly different from those predicted by hydrologic models, even when taking into account effects of suburban development. Additionally, the impacts of urban development, precipitation increase, and topographic subsidence were examined in concert in an attempt to quantify the individual impacts of each on potential flooded area. It was found that the three contributions of nonstationarity were individually quantifiable, and that the contributions from precipitation changes and topographic subsidence were the most significant sources. Land development was the least influential
contributor, though still significant.
Engineering design under changing hydrologic conditions will be one of the major challenges for the industry in the coming decades. This research examined several design techniques available in the literature and subjected them to quantitative and qualitative assessment measures to determine their performance under prevailing design assumptions. The assessment measures tentatively indicated that modular designs and designs based on the theory of ecosystem services may be most suitable under potential future hydrologic conditions.
Advisors/Committee Members: Brumbelow, Kelly (advisor), Cahill, Anthony (advisor), Wurbs, Ralph (committee member), Houser, Christopher (committee member).
Subjects/Keywords: civil engineering; hydrology; hydrologic design; nonstationarity
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APA (6th Edition):
Faloon, A. E. (2015). Adapting to Hydrologic Nonstationarity in Engineering Design. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/156295
Chicago Manual of Style (16th Edition):
Faloon, Anna Elizabeth. “Adapting to Hydrologic Nonstationarity in Engineering Design.” 2015. Doctoral Dissertation, Texas A&M University. Accessed April 13, 2021.
http://hdl.handle.net/1969.1/156295.
MLA Handbook (7th Edition):
Faloon, Anna Elizabeth. “Adapting to Hydrologic Nonstationarity in Engineering Design.” 2015. Web. 13 Apr 2021.
Vancouver:
Faloon AE. Adapting to Hydrologic Nonstationarity in Engineering Design. [Internet] [Doctoral dissertation]. Texas A&M University; 2015. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/1969.1/156295.
Council of Science Editors:
Faloon AE. Adapting to Hydrologic Nonstationarity in Engineering Design. [Doctoral Dissertation]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/156295
Texas A&M University
20.
Zhao, Gang.
The Role of Reservoir Flow Regulation and Evaporation in Water Resources Management.
Degree: PhD, Civil Engineering, 2018, Texas A&M University
URL: http://hdl.handle.net/1969.1/174431
► Surface water reservoirs have been used for supporting many water resources applications such as flood control, water supply, and hydropower generation. Modeling of reservoir systems…
(more)
▼ Surface water reservoirs have been used for supporting many water resources applications such as flood control, water supply, and hydropower generation. Modeling of reservoir systems and observations of the key water budget terms are essential for providing precise information for modern water resources management. In this dissertation, a series of modeling and remote sensing approaches were established to improve our understanding about reservoir systems under a changing environment. These approaches are presented in three step-by-step studies:
1. In the first study, a reservoir module was incorporated into a physically-based distributed hydrological model to fill in the gap between rainfall-runoff models and river/watershed management models. The new modeling framework was calibrated and validated over Lake Whitney. The simulated results were found robust at daily, weekly, and monthly levels. The new model provides the capability of simulating reservoir flow regulation in a changing environment.
2. The integrated modeling framework was then applied to the Dallas metropolitan area to evaluate the impacts of potential droughts and population growth on future water supply reliability. Results suggested that reservoir storage and water supply reliability during the second half of the 21st century (2050–2099) are projected to decline by 16.1% and 14.2% when compared to the first half (2000–2049). The uncertainty associated with future climate projection is larger than that associated with urbanization.
3. In the last study, an algorithm was developed by combining the remotely sensed reservoir surface area with the modeled evaporation rate to quantify the evaporation amount for 209 major reservoirs in the United States. The evaporation rate shows a positive trend (due to the current brightening trend) while the total surface area shows a negative trend (due to reduced precipitation in the western US). Consequently, the total evaporation amount shows no significant trend from 1985 to 2014.
Advisors/Committee Members: Gao, Huilin (advisor), Olivera, Francisco (committee member), Wurbs, Ralph (committee member), Nielsen-Gammon, John (committee member).
Subjects/Keywords: Reservoir modeling; non-stationarity; evaporation; remote sensing
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APA (6th Edition):
Zhao, G. (2018). The Role of Reservoir Flow Regulation and Evaporation in Water Resources Management. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/174431
Chicago Manual of Style (16th Edition):
Zhao, Gang. “The Role of Reservoir Flow Regulation and Evaporation in Water Resources Management.” 2018. Doctoral Dissertation, Texas A&M University. Accessed April 13, 2021.
http://hdl.handle.net/1969.1/174431.
MLA Handbook (7th Edition):
Zhao, Gang. “The Role of Reservoir Flow Regulation and Evaporation in Water Resources Management.” 2018. Web. 13 Apr 2021.
Vancouver:
Zhao G. The Role of Reservoir Flow Regulation and Evaporation in Water Resources Management. [Internet] [Doctoral dissertation]. Texas A&M University; 2018. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/1969.1/174431.
Council of Science Editors:
Zhao G. The Role of Reservoir Flow Regulation and Evaporation in Water Resources Management. [Doctoral Dissertation]. Texas A&M University; 2018. Available from: http://hdl.handle.net/1969.1/174431
Texas A&M University
21.
Blake, John K.
Quantification of Available Water Content Comparing Standard Methods and the Pedostructure Concept on Four Different Soils.
Degree: MS, Civil Engineering, 2016, Texas A&M University
URL: http://hdl.handle.net/1969.1/158613
► The purpose of this study is to evaluate the use of the pedostructure soil concept to determine the available water within soil. Specifically, the hydro-structural…
(more)
▼ The purpose of this study is to evaluate the use of the pedostructure soil concept to determine the available water within soil. Specifically, the hydro-structural behavior of the soil in the pedostructure is compared to standard methods of determining field capacity and permanent wilting point. The standard methods evaluated are: the FAO texture estimate, Saxon and Rawls’ pedotransfer functions, and the pressure plate method. Additionally, there are two pedostructure methods that are assessed: the water retention curve (WRC) and the soil shrinkage curve (ShC) methods. Three different types of soils were used: 1) Loamy Fine Sand: Undisturbed cores: Millican,
Texas, USA; 2) Silty Loam: Reconstituted cores: Versailles soil, France; and 3) Silty clay loam: Reconstituted cores, Rodah Soils, Qatar. The results showed that the water contents at specific water potentials, empirically suggested values, of 330 hPa and 15,000 hPa for estimating the field capacity and permanent wilting point, respectively the three standards methods and the pedostructure WRC method were in relative agreement. On the other hand, the ShC method used transition characteristic points in the shrinkage curve to estimate the field capacity and permanent wilting point and was significantly higher. For example, in the fine sandy loam Ap horizon analyzed in this study, the filed capacity estimates by standard and WRC methods ranged from 0.073 to 0.150
m3H2O/
m3Soil while the ShC method estimate was 0.342
m3H2)/
m3Soil. Overall, it is evident that the process of extracting parameters from the ShC that correlate to the field capacity point of a soil always results in a larger amount of available water. One potential reason for the higher values could be in the selection of the transition point that represents the field capacity. Therefore, it is suggested to have further research to identify the most suitable characteristic point on the shrinkage curve to represent the field capacity value.
Advisors/Committee Members: Mohtar, Rabi H (advisor), Morgan, Cristine (committee member), Wurbs, Ralph (committee member), Braudeau, Erik (committee member), Assi, Amjad (committee member).
Subjects/Keywords: Pedostructure; Shrinkage Curve; Water Retention Curve; Available Water; Soil Thermodynamcis, Soil Water Holding Capacity
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APA (6th Edition):
Blake, J. K. (2016). Quantification of Available Water Content Comparing Standard Methods and the Pedostructure Concept on Four Different Soils. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/158613
Chicago Manual of Style (16th Edition):
Blake, John K. “Quantification of Available Water Content Comparing Standard Methods and the Pedostructure Concept on Four Different Soils.” 2016. Masters Thesis, Texas A&M University. Accessed April 13, 2021.
http://hdl.handle.net/1969.1/158613.
MLA Handbook (7th Edition):
Blake, John K. “Quantification of Available Water Content Comparing Standard Methods and the Pedostructure Concept on Four Different Soils.” 2016. Web. 13 Apr 2021.
Vancouver:
Blake JK. Quantification of Available Water Content Comparing Standard Methods and the Pedostructure Concept on Four Different Soils. [Internet] [Masters thesis]. Texas A&M University; 2016. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/1969.1/158613.
Council of Science Editors:
Blake JK. Quantification of Available Water Content Comparing Standard Methods and the Pedostructure Concept on Four Different Soils. [Masters Thesis]. Texas A&M University; 2016. Available from: http://hdl.handle.net/1969.1/158613
Texas A&M University
22.
Lewis, Alan Christopher.
Assessing Urban Residential Irrigation Performance Using a Water Budget Approach.
Degree: MS, Water Management and Hydrological Science, 2014, Texas A&M University
URL: http://hdl.handle.net/1969.1/154216
► Wasting water by excessive irrigation of urban residential landscapes is a ubiquitous problem. By reducing irrigation in excess of plant water needs, homeowners and cities…
(more)
▼ Wasting water by excessive irrigation of urban residential landscapes is a ubiquitous problem. By reducing irrigation in excess of plant water needs, homeowners and cities save substantial quantities water. Although water utilities can use a variety of approaches to encourage customers to reduce their consumption, some residences may use water more efficiently than others. By understanding patterns of irrigation performance among customers, water utilities can develop more economical approaches for encouraging water conservation. Irrigation performance can be assessed by comparing outdoor water use with a landscape water budget. This requires an accurate estimate of irrigated landscape area, which can be difficult to obtain for citywide datasets. A bivariate approach using tax appraisal information is proposed, which can be applied in any county. Irrigation performance was assessed for 5,565 single-family residences by examining their conformance to monthly water budgets. Nonconformance was defined as outdoor water use exceeding the monthly budget volume. Large lots were found to overwater by significantly greater volumes than smaller lots. However, lots with smaller landscape areas tended to overwater more frequently and apply higher volumes per unit area. These findings suggest new management options for addressing consistently wasteful water use and improving efficiency.
Advisors/Committee Members: Kaiser, Ronald A (advisor), Wurbs, Ralph A (committee member), Brumbelow, Kelly (committee member), Quiring, Steven M (committee member).
Subjects/Keywords: Landscape irrigation; performance; Pervious area estimation; Residential irrigation; Urban water conservation; Residential water use
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APA (6th Edition):
Lewis, A. C. (2014). Assessing Urban Residential Irrigation Performance Using a Water Budget Approach. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/154216
Chicago Manual of Style (16th Edition):
Lewis, Alan Christopher. “Assessing Urban Residential Irrigation Performance Using a Water Budget Approach.” 2014. Masters Thesis, Texas A&M University. Accessed April 13, 2021.
http://hdl.handle.net/1969.1/154216.
MLA Handbook (7th Edition):
Lewis, Alan Christopher. “Assessing Urban Residential Irrigation Performance Using a Water Budget Approach.” 2014. Web. 13 Apr 2021.
Vancouver:
Lewis AC. Assessing Urban Residential Irrigation Performance Using a Water Budget Approach. [Internet] [Masters thesis]. Texas A&M University; 2014. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/1969.1/154216.
Council of Science Editors:
Lewis AC. Assessing Urban Residential Irrigation Performance Using a Water Budget Approach. [Masters Thesis]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/154216
Texas A&M University
23.
Cui, Huijuan.
Entropy Theory for Streamflow Forecasting.
Degree: PhD, Water Management and Hydrological Science, 2015, Texas A&M University
URL: http://hdl.handle.net/1969.1/155060
► Entropy spectral analysis is developed for monthly streamflow forecasting, which contains the use of configurational entropy and relative entropy. Multi-channel entropy spectral analysis is developed…
(more)
▼ Entropy spectral analysis is developed for monthly streamflow forecasting, which contains the use of configurational entropy and relative entropy. Multi-channel entropy spectral analysis is developed for long-term drought forecasting with climate indicators.
The configurational entropy spectral analysis (CESA) is developed with both spectral power and frequency as random variables. With spectral power as a random variable, the configurational entropy spectral analysis (CESAS) identical to the original Burg entropy spectral analysis (BESA) when the underlying process is Gaussian. Through examination using monthly streamflow from the Mississippi Watershed, CESAS and BESA yield the same results and two methods are considered equivalent or as one method. With frequency as a random variable, the configurational entropy spectral analysis (CESAF) is developed and tested using monthly streamflow data from 19 river basins covering a broad range of physiographic characteristics. Testing shows that CESAF captures streamflow seasonality and satisfactorily forecasts both high and low flows. When relative drainage area is considered for analyzing streamflow characteristics and spectral patterns, it is found that upstream streamflow is forecasted more accurately than downstream streamflow.
Minimum relative entropy spectral analysis (MRESA) is developed under two conditions: spectral power as a random variable (RESAS) and frequency as a random variable (RESAF). The exponential distribution was chosen as a prior probability in the RESAS theory, and in the RESAF theory, the prior is chosen from the periodicity of streamflow. Both MRESA theories were evaluated using monthly streamflow observed at
20 stations in the Mississippi River basin, where forecasted monthly streamflow shows
higher reliability in the Upper Mississippi than in the Lower Mississippi.
The proposed univariate entropy spectral analyses are generally recommended over the classical autoregressive (AR) process for higher reliability and longer forecasting lead time. By comparing two MRESA theories with the two maximum entropy spectral analyses (MESA) (BESA and CESA), it is found that MRESA provided higher resolution in spectral estimation and more reliable streamflow forecasting, especially for multi-peak flow conditions. The MRESA theory is more accurate in forecasting streamflow for both peak and low flow values with longer lead time than MESA. Besides, choosing frequency as a random variable shows advantages over choosing spectral power. Spectral density estimated by the RESAF or CESAF theory shows higher resolution than the RESAS or BESA theory, respectively, and streamflow forecasted by RESAF or CESAF is more reliable than that by RESAS or BESA, respectively.
Finally, multi-channel entropy spectral analysis (MCESA) is developed for bivariate or multi-variate time series forecasting. MCESA theory is verified by forecasting long-term standardized streamflow index with El Nino Southern Oscillation (ENSO) indicator. SSI was successfully forecasted using…
Advisors/Committee Members: Singh, Vijay P. (advisor), Cahill, Anthonny T. (committee member), Wurbs, Ralph A. (committee member), Pourahmadi, Mohsen (committee member).
Subjects/Keywords: streamflow forecasting; entropy; spectral analysis; time series analysis
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APA (6th Edition):
Cui, H. (2015). Entropy Theory for Streamflow Forecasting. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/155060
Chicago Manual of Style (16th Edition):
Cui, Huijuan. “Entropy Theory for Streamflow Forecasting.” 2015. Doctoral Dissertation, Texas A&M University. Accessed April 13, 2021.
http://hdl.handle.net/1969.1/155060.
MLA Handbook (7th Edition):
Cui, Huijuan. “Entropy Theory for Streamflow Forecasting.” 2015. Web. 13 Apr 2021.
Vancouver:
Cui H. Entropy Theory for Streamflow Forecasting. [Internet] [Doctoral dissertation]. Texas A&M University; 2015. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/1969.1/155060.
Council of Science Editors:
Cui H. Entropy Theory for Streamflow Forecasting. [Doctoral Dissertation]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/155060
Texas A&M University
24.
Hao, Zengchao.
Application of Entropy Theory in Hydrologic Analysis and Simulation.
Degree: PhD, Biological and Agricultural Engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10828
► The dissertation focuses on the application of entropy theory in hydrologic analysis and simulation, namely, rainfall analysis, streamflow simulation and drought analysis. The extreme value…
(more)
▼ The dissertation focuses on the application of entropy theory in hydrologic analysis and simulation, namely, rainfall analysis, streamflow simulation and drought analysis.
The extreme value distribution has been employed for modeling extreme rainfall values. Based on the analysis of changes in the frequency distribution of annual rainfall maxima in
Texas with the changes in duration, climate zone and distance from the sea, an entropy-based distribution is proposed as an alternative distribution for modeling extreme rainfall values. The performance of the entropy based distribution is validated by comparing with the commonly used generalized extreme value (GEV) distribution based on synthetic and observed data and is shown to be preferable for extreme rainfall values with high skewness.
An entropy based method is proposed for single-site monthly streamflow simulation. An entropy-copula method is also proposed to simplify the entropy based method and preserve the inter-annual dependence of monthly streamflow. Both methods are shown to preserve statistics, such as mean, standard deviation, skenwess and lag-one correlation, well for monthly streamflow in the Colorado River basin. The entropy and entropy-copula methods are also extended for multi-site annual streamflow simulation at four stations in the Colorado River basin. Simulation results show that both methods preserve the mean, standard deviation and skewness equally well but differ in preserving the dependence structure (e.g., Pearson linear correlation).
An entropy based method is proposed for constructing the joint distribution of drought variables with different marginal distributions and is applied for drought analysis based on monthly streamflow of Brazos River at Waco,
Texas. Coupling the entropy theory and copula theory, an entropy-copula method is also proposed for constructing the joint distribution for drought analysis, which is illustrated with a case study based on the Parmer drought severity index (PDSI) data in Climate Division 5 in
Texas.
Advisors/Committee Members: Singh, Vijay P. (advisor), Huang, Yongheng (committee member), Wurbs, Ralph A. (committee member), Zhan, Hongbin (committee member), Pourahmadi, Mohsen (committee member).
Subjects/Keywords: rainfall analysis; streamflow simulation; drought analysis; maximum entropy; copula; joint distribution
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APA (6th Edition):
Hao, Z. (2012). Application of Entropy Theory in Hydrologic Analysis and Simulation. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10828
Chicago Manual of Style (16th Edition):
Hao, Zengchao. “Application of Entropy Theory in Hydrologic Analysis and Simulation.” 2012. Doctoral Dissertation, Texas A&M University. Accessed April 13, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10828.
MLA Handbook (7th Edition):
Hao, Zengchao. “Application of Entropy Theory in Hydrologic Analysis and Simulation.” 2012. Web. 13 Apr 2021.
Vancouver:
Hao Z. Application of Entropy Theory in Hydrologic Analysis and Simulation. [Internet] [Doctoral dissertation]. Texas A&M University; 2012. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10828.
Council of Science Editors:
Hao Z. Application of Entropy Theory in Hydrologic Analysis and Simulation. [Doctoral Dissertation]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10828
25.
Ayala, Rolando A.
Impact of Reservoir Evaporation and Evaporation Suppression on Water Supply Capabilities.
Degree: MS, Civil Engineering, 2013, Texas A&M University
URL: http://hdl.handle.net/1969.1/149357
► Reservoir storage is essential for developing dependable water supplies and is a major component of the river system water budget. The storage contents of reservoirs…
(more)
▼ Reservoir storage is essential for developing dependable water supplies and is a major component of the river system water budget. The storage contents of reservoirs fluctuate greatly with variations in water use and climatic conditions that range from severe multiple-year droughts to floods. Water surface evaporation typically represents a major component of the reservoir water budget. This thesis investigates the effects of evaporation and potential reductions in this evaporation on the water supply capabilities of reservoirs in
Texas.
As part of this research, a literature review based assessment of capabilities for reducing reservoir evaporation using monolayer films and other methods was performed. The literature review assessment provides an overview of past evaporation suppression studies performed using monolayer films and other evaporation suppression technologies including water shades and covers. The overview provides a summary on monolayer film application techniques, environmental impacts, operational and material costs, evaluation methods, and achievable evaporation reduction rates.
This research project quantifies the impact of reservoir evaporation on water supply availability/reliability by using the
Texas Water Availability Modeling (WAM) System which consists of the Water Rights Analysis Package (WRAP) and 21 sets of WRAP input files covering the 23 river basins of the state, a geographic information system (GIS), and contains over 8,000 water rights permits, which include 3,435 reservoirs. The impact of evaporation on water supply availability/reliability was evaluated by performing several analyses in which evaporation rates are reduced by specified percentages starting when storage levels drop below certain trigger percentages of reservoir storage capacity.
Advisors/Committee Members: Wurbs, Ralph A (advisor), Cahill, Anthony (committee member), Munster, Clyde (committee member).
Subjects/Keywords: WRAP; Reservoir evaporation euppression; Monolayer films; Texas River Basins
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APA (6th Edition):
Ayala, R. A. (2013). Impact of Reservoir Evaporation and Evaporation Suppression on Water Supply Capabilities. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/149357
Chicago Manual of Style (16th Edition):
Ayala, Rolando A. “Impact of Reservoir Evaporation and Evaporation Suppression on Water Supply Capabilities.” 2013. Masters Thesis, Texas A&M University. Accessed April 13, 2021.
http://hdl.handle.net/1969.1/149357.
MLA Handbook (7th Edition):
Ayala, Rolando A. “Impact of Reservoir Evaporation and Evaporation Suppression on Water Supply Capabilities.” 2013. Web. 13 Apr 2021.
Vancouver:
Ayala RA. Impact of Reservoir Evaporation and Evaporation Suppression on Water Supply Capabilities. [Internet] [Masters thesis]. Texas A&M University; 2013. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/1969.1/149357.
Council of Science Editors:
Ayala RA. Impact of Reservoir Evaporation and Evaporation Suppression on Water Supply Capabilities. [Masters Thesis]. Texas A&M University; 2013. Available from: http://hdl.handle.net/1969.1/149357
26.
Hewitt, Natalie Case.
Modeling plankton dynamics during a Prymnesium parvum bloom: The importance of inflows and allelopathic relationships on bloom dynamics.
Degree: MS, Water Management and Hydrological Science, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9376
► Harmful algal blooms' global amplification has driven research on growth characteristics and instigating mechanisms. These blooms prosper under diverse environmental conditions, creating challenges identifying bloom…
(more)
▼ Harmful algal blooms' global amplification has driven research on growth characteristics and instigating mechanisms. These blooms prosper under diverse environmental conditions, creating challenges identifying bloom initiation. The haptophyte, Prymnesium parvum, plagues the southwestern United States with massive system disruptions and huge fish kills caused by its toxin. Despite many abiotic factors' association with P. parvum blooms, low nutrient levels stress the alga increasing toxin production, eliminating nutrient competition, and alleviating grazing pressures. This model examines the relationship between nutrient availability and P. parvum toxin production against another phytoplankton and a single grazing zooplankton, using a Monod function relating population growth rate with limiting nutrient concentrations. Sensitivity analyses emphasize plankton biological parameters most influential in accumulating biomass. The impact of toxin production on zooplankton grazing rates underscores P. parvum's need for top-down control suppression. The toxin production equation increases production when P. parvum experiences low specific growth rates from nutrient availability and low biomass. This equation is analyzed against previously published allelopathic relationships, comparing plankton reactions and bloom endurance. The model's toxin production equation proves more ecologically feasible, incorporating competing phytoplankton species' mortality and variables easily verified through laboratory experiments. Though not intended for management strategy development, the model explores and supports the proposed strategy of incorporating hydraulic flushing, pulsed and continuous inflows, to eliminate biomass accumulation. Inflows relieve stressful nutrient-limiting conditions, introducing resources affecting bloom stability and plankton community dynamics. The faster-growing competing phytoplankton gains survival advantages when inflow rates fall lower than its maximum specific growth rate, but greater than P. Parvum's, emphasizing the accurate measuring of competitors' maximum specific growth rates and identifying a dilution rate range where P. parvum loses at nutrient intake. Inflows with various nutrient levels representing different source waters from freshwater lakes were tested for impacts on plankton dynamics. Adding any hydrological effect reduced P. parvum biomass. Disruptions create disturbance, removing P. parvum's system-dominating position, allowing the phytoplankton to exceed P. parvum's density. The model highlights the importance of P. parvum's toxin's presence to maintain dominance and emphasizes flushing agitation as potential and feasible management schemes to deter bloom continuation and increase species diversity.
Advisors/Committee Members: Roelke, Daniel (advisor), Wurbs, Ralph (committee member), Smith, Patricia (committee member), Grover, James (committee member).
Subjects/Keywords: P. parvum; inflows; allelopathy; plankton; dynamics
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APA (6th Edition):
Hewitt, N. C. (2012). Modeling plankton dynamics during a Prymnesium parvum bloom: The importance of inflows and allelopathic relationships on bloom dynamics. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9376
Chicago Manual of Style (16th Edition):
Hewitt, Natalie Case. “Modeling plankton dynamics during a Prymnesium parvum bloom: The importance of inflows and allelopathic relationships on bloom dynamics.” 2012. Masters Thesis, Texas A&M University. Accessed April 13, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9376.
MLA Handbook (7th Edition):
Hewitt, Natalie Case. “Modeling plankton dynamics during a Prymnesium parvum bloom: The importance of inflows and allelopathic relationships on bloom dynamics.” 2012. Web. 13 Apr 2021.
Vancouver:
Hewitt NC. Modeling plankton dynamics during a Prymnesium parvum bloom: The importance of inflows and allelopathic relationships on bloom dynamics. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9376.
Council of Science Editors:
Hewitt NC. Modeling plankton dynamics during a Prymnesium parvum bloom: The importance of inflows and allelopathic relationships on bloom dynamics. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9376
27.
Lee, Sang Hyun.
Prioritizing Water Pipe Replacement and Rehabilitation by Evaluating Failure Risk.
Degree: MS, Biological and Agricultural Engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2011-12-10615
► Essential to human life is water. Drinking water, in particular, is of utmost significance for all living creatures including man. An examination of the transmission…
(more)
▼ Essential to human life is water. Drinking water, in particular, is of utmost significance for all living creatures including man. An examination of the transmission process of drinking water reveals the high importance of pipe lines. The water pipe lines delivering water today encounter serious problems. Corrosion has caused deterioration in pipe lines, which contributes rust to drinking, a serious water quality problem. In addition, pipe line failures have caused social issues, such as suspension of water supply. This study developed a model to estimate the life expectancy and residual life of a pipe based on the assessment of failure risk in order to evaluate the current failure possibility and predict when the pipe will reach the point of failure. The developed model for estimation of residual life by failure risk was used to assess the failure risk of water pipes based on the general data and pipe sources of the Chang Won City water pipes. The efforts to diagnose and evaluate water pipes are limited to the assessment of current pipe conditions, which is why they can easily determine the priority of rehabilitation based on the current pipe conditions but have hard time getting information about how the pipes have deteriorated to the point of requiring rehabilitation. The objectives of this study are: (1) develop a model for estimating corrosion rates and residual thickness of water pipes, (2) assess loads and stress affecting water pipes, (3) to estimate damage risk, and (4) calculate safety factors. Results of the study could help reduce rehabilitation costs and secure water quality after renovation. Thus it would contribute to the safe and stable operation and management of pipe networks by increasing the life of water pipes.
Advisors/Committee Members: Singh, Vijay P. (advisor), Smith, Patricia K. (committee member), Wurbs, Ralph A. (committee member).
Subjects/Keywords: water pipe; corrosion; safety factor; water quality
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APA (6th Edition):
Lee, S. H. (2012). Prioritizing Water Pipe Replacement and Rehabilitation by Evaluating Failure Risk. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2011-12-10615
Chicago Manual of Style (16th Edition):
Lee, Sang Hyun. “Prioritizing Water Pipe Replacement and Rehabilitation by Evaluating Failure Risk.” 2012. Masters Thesis, Texas A&M University. Accessed April 13, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2011-12-10615.
MLA Handbook (7th Edition):
Lee, Sang Hyun. “Prioritizing Water Pipe Replacement and Rehabilitation by Evaluating Failure Risk.” 2012. Web. 13 Apr 2021.
Vancouver:
Lee SH. Prioritizing Water Pipe Replacement and Rehabilitation by Evaluating Failure Risk. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-12-10615.
Council of Science Editors:
Lee SH. Prioritizing Water Pipe Replacement and Rehabilitation by Evaluating Failure Risk. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-12-10615
28.
Chun, Gunil.
Integration of Flow Extension, Water Reallocation and Drought Monitoring and Forecasting in Multi-Purpose River/Reservoir System Management.
Degree: PhD, Civil Engineering, 2018, Texas A&M University
URL: http://hdl.handle.net/1969.1/174325
► Population and economic growth have contributed to increasing water uses while available water resources are limited. Recently, the occurrence and damage of drought are increasing…
(more)
▼ Population and economic growth have contributed to increasing water uses while available water resources are limited. Recently, the occurrence and damage of drought are increasing worldwide due to the impact of climate change. The effective water management requires for assessment on the current and future water availability based on a water allocation strategy, scenarios, and updating hydrological condition.
The extension of hydrologic period-of-analysis for the
Texas WAM/WRAP System increases the model capability. A new water allocation strategy based on
Texas WRAP/WAM water priority system is established for water management in Korea. Groundwater drought monitoring and forecasting methodology in Korea was developed based on correlation between groundwater level observation data and precipitation data using Artificial Neural Network model. The research consists of the following tasks:
• The original sequences of Brazos WAM input dataset has a 1940-1997 hydrologic period-of-analysis. The methodology developed in this research is to update and extend hydrologic sequences of input datasets to present using precipitation and evaporation maintained by TWDB. This approach is much easier to implement and is particularly advantageous in situations where accurate data required to adjust observed flows are unavailable or difficult to compile or stream gaging station have been discontinued.
• Korea has no water right system considering priority of each water right. The research included developing a water allocation strategy in Korea based on two alternative schemes. A priority-based long-term water allocation strategy was developed for national scale water management and planning. A water allocation strategy for relatively short-term water availability study for drought management is established based on reallocating water supply to hydropower dam and reducing some portions of water supplies.
• The groundwater drought monitoring and forecasting methodology was developed to support the Drought Early Warning System in Korea. The methodology is based on Standardized Groundwater level Index (SGI). The SGIs for 256 monitoring sites were converted into the area SGI for 167 cities nationwide. The groundwater drought forecasting method was developed based on the correlation between SPI and SGI. The correlation model was employed NARX Neural Network Model. The groundwater drought forecasting was conducted with the correlation model and SPI forecasts.
Advisors/Committee Members: Wurbs, Ralph A. (advisor), Cahill, Anthony (committee member), Brumbelow, Kelly (committee member), Smith, Patricia (committee member).
Subjects/Keywords: WRAP/WAM; drought
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APA (6th Edition):
Chun, G. (2018). Integration of Flow Extension, Water Reallocation and Drought Monitoring and Forecasting in Multi-Purpose River/Reservoir System Management. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/174325
Chicago Manual of Style (16th Edition):
Chun, Gunil. “Integration of Flow Extension, Water Reallocation and Drought Monitoring and Forecasting in Multi-Purpose River/Reservoir System Management.” 2018. Doctoral Dissertation, Texas A&M University. Accessed April 13, 2021.
http://hdl.handle.net/1969.1/174325.
MLA Handbook (7th Edition):
Chun, Gunil. “Integration of Flow Extension, Water Reallocation and Drought Monitoring and Forecasting in Multi-Purpose River/Reservoir System Management.” 2018. Web. 13 Apr 2021.
Vancouver:
Chun G. Integration of Flow Extension, Water Reallocation and Drought Monitoring and Forecasting in Multi-Purpose River/Reservoir System Management. [Internet] [Doctoral dissertation]. Texas A&M University; 2018. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/1969.1/174325.
Council of Science Editors:
Chun G. Integration of Flow Extension, Water Reallocation and Drought Monitoring and Forecasting in Multi-Purpose River/Reservoir System Management. [Doctoral Dissertation]. Texas A&M University; 2018. Available from: http://hdl.handle.net/1969.1/174325
29.
Cristancho, Camilo Andres.
Environmental Flow Standards in Water Availability Modeling.
Degree: MS, Civil Engineering, 2017, Texas A&M University
URL: http://hdl.handle.net/1969.1/165840
► The Texas Commission on Environmental Quality (TCEQ) has established environmental flow standards in seven river systems through a process defined by the Texas Legislature in…
(more)
▼ The
Texas Commission on Environmental Quality (TCEQ) has established environmental flow standards in seven river systems through a process defined by the
Texas Legislature in its 2007 Senate Bill 3 (SB3). The environmental flow standards have been incorporated in the state’s water right permitting system with a priority date that corresponds to the date when the flow recommendations were received by the TCEQ. Therefore, all the environmental flow standards in the different systems are junior to the water rights previously granted in the state. This thesis first presents a comprehensive literature review of environmental flow standards and an explanation of the process that led to the implementation of environmental flow standards in
Texas. Moreover, a comparative assessment regarding the structure of the environmental flow standards is presented to reveal the differences between the river systems defined by TCEQ.
Additionally, this thesis presents a research study that used frequency analyses and Water Rights Analysis Package capabilities to evaluate the attainment of environmental flow standards and the impacts of the standards on unappropriated flows. This assessment revealed that none of the standards are met 100% of the time due to the priority system that regulates surface water in the state. This system protects old water rights in the state, so environmental flow standards only affect water availability of future water rights. Because of this, this study included frequency analyses for unappropriated flows considering two scenarios for each system: (a) without including SB3 standards and (b) including SB3 standards. These analyses revealed that attainment of environmental flow and water availability depends on the geographical location.
Advisors/Committee Members: Wurbs, Ralph (advisor), Cahill, Anthony (committee member), Munster, Clyde (committee member).
Subjects/Keywords: Environmental Flow Standards; WRAP; WAM; Senate Bill 3; TCEQ
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APA (6th Edition):
Cristancho, C. A. (2017). Environmental Flow Standards in Water Availability Modeling. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/165840
Chicago Manual of Style (16th Edition):
Cristancho, Camilo Andres. “Environmental Flow Standards in Water Availability Modeling.” 2017. Masters Thesis, Texas A&M University. Accessed April 13, 2021.
http://hdl.handle.net/1969.1/165840.
MLA Handbook (7th Edition):
Cristancho, Camilo Andres. “Environmental Flow Standards in Water Availability Modeling.” 2017. Web. 13 Apr 2021.
Vancouver:
Cristancho CA. Environmental Flow Standards in Water Availability Modeling. [Internet] [Masters thesis]. Texas A&M University; 2017. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/1969.1/165840.
Council of Science Editors:
Cristancho CA. Environmental Flow Standards in Water Availability Modeling. [Masters Thesis]. Texas A&M University; 2017. Available from: http://hdl.handle.net/1969.1/165840
30.
Singh, Abhishek.
Computation of Probable Maximum Precipitation (PMP) and Its Uncertainty.
Degree: MS, Biological and Agricultural Engineering, 2016, Texas A&M University
URL: http://hdl.handle.net/1969.1/158698
► Probable Maximum Precipitation (PMP) is used for estimating Probable Maximum Flood (PMF) which, in turn, is used for design of major hydraulic structures, such as…
(more)
▼ Probable Maximum Precipitation (PMP) is used for estimating Probable Maximum Flood (PMF) which, in turn, is used for design of major hydraulic structures, such as dams and spillways, flood protection works, and nuclear power plants. One of the commonly used methods for estimating PMP is the statistical method that entails computation of frequency factor, adjustment of the frequency factor, construction of an enveloping curve of the frequency factor, estimation of PMP, choosing a probability distribution, and determination of the return period. This study determined the PMP values for different durations using data from the Brazos River basin,
Texas. There are, however, uncertainties associated with the PMP values estimated using the statistical method. It was found that significant uncertainty in the PMP estimates can occur from the use of enveloping curve of the frequency factor, and uncertainty in sample mean and sample standard deviation. Hershfield’s curve yielded higher PMP estimates, therefore, a basin specific-enveloping curve is suggested. The return period of a PMP value was obtained from frequency analysis. From 24 commonly used statistical distributions, 5 goodness of fit tests and the use of hazard rate, the Burr XII distribution was found to be the best frequency distribution. It was observed that the return period was not significantly higher than that obtained from the hydrometeorological reports (HMRs) of National Weather Service and other studies. For quantifying uncertainty, design risk estimates along with probability bounds on the PMP values were determined. The relative contribution of each random variable to the total uncertainty was also determined. Then, risk analysis of extreme precipitation was also done to assess the damage a PMP event can cause. The damage due to a single PMP event of 12-hour duration can be as high as 2 billion U.S. dollars in Harris County,
Texas.
Advisors/Committee Members: Singh, Vijay (advisor), Wurbs, Ralph (committee member), Ale, Srinivasulu (committee member).
Subjects/Keywords: PMP; Uncertainty; Risk analysis; Burr XII distribution; damage; Hershfield method; Statistical method; Frequency factor; Enveloping curve
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APA ·
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APA (6th Edition):
Singh, A. (2016). Computation of Probable Maximum Precipitation (PMP) and Its Uncertainty. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/158698
Chicago Manual of Style (16th Edition):
Singh, Abhishek. “Computation of Probable Maximum Precipitation (PMP) and Its Uncertainty.” 2016. Masters Thesis, Texas A&M University. Accessed April 13, 2021.
http://hdl.handle.net/1969.1/158698.
MLA Handbook (7th Edition):
Singh, Abhishek. “Computation of Probable Maximum Precipitation (PMP) and Its Uncertainty.” 2016. Web. 13 Apr 2021.
Vancouver:
Singh A. Computation of Probable Maximum Precipitation (PMP) and Its Uncertainty. [Internet] [Masters thesis]. Texas A&M University; 2016. [cited 2021 Apr 13].
Available from: http://hdl.handle.net/1969.1/158698.
Council of Science Editors:
Singh A. Computation of Probable Maximum Precipitation (PMP) and Its Uncertainty. [Masters Thesis]. Texas A&M University; 2016. Available from: http://hdl.handle.net/1969.1/158698
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Open Access Theses and Dissertations
