Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 19 of 19 for “"Watershed models"”.
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Improving Watershed Models to Achieve a Better Prediction of Water Quantity and Quality
Watershed models are powerful tools for simulating different scenarios to understand the impact of management practices and are used to support and guide decision-making. However, there are often challenges and limitations to using watershed models in some areas of watershed modeling; 1) model …
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A study of aquatic sedimentation in Chattanooga, Tennessee, using GIS and remote sensing technology integrated with hydrodynamic and watershed models
… need to quantitatively monitor water bodies and watersheds is key to reduce excessive suspended concentrations. This study aims to integrate remote sensing technology with numerical watershed and hydrodynamic models and apply them on the Tennessee River and the surrounding tributaries to better …
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Monitoring of Selected Bacteriological Parameters Associated with the Sinking Creek Total Maximum Daily Load (TMDL).
… and 2) compare data collected to results from watershed models used in the TMDL. Fourteen sites on Sinking Creek were monitored monthly and concentrations of total coliforms, fecal coliforms, and selected physical water quality parameters measured. Fecal coliform concentrations were >1000 …
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Modeling Channel Degradation at the Watershed Scale: A Comparison of GWLF, SWAT, and CONCEPTS
… This research focused on testing the ability of watershed and reach-scale models to predict stream channel degradation. Model predictions were compared to estimates developed from a system of erosion pins and scour chains. A 500-m experimental reach in Blacksburg, VA, USA, was selected as the …
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Improved Understanding Of Subsurface Hydrology In Variable Source Areas And Its Implications For Water Quality
… can be captured in ungaged basins using watershed models. To determine the controls on VSA formation and connectivity, a 0.5 ha hillslope was instrumented (trenched) in the southern tier of New York, U.S. Water flux from different soil layers in the trench and upslope water table dynamics …
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Geomorphic modeling and routing improvements for GIS-based watershed assessment in arid regions.
Watershed models have two significant shortcomings that limit their application to management problems in arid and semi-arid regions. The first is that the performance of event-based hydrologic models for ephemeral stream networks declines significantly as watershed size increases. The second is …
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A Systems Approach to Modeling and Impact Assessment in an Urbanizing Watershed
… futures combined with spatially explicit watershed modeling provides a way to scope resource management problems and increase understanding of how current policies, regulations, and practices could play out in the future and impact both watershed-level hydrologic response and water …
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Hydrogeology and geomorphology of two structurally dissimilar terranes in Pennsylvania
<p>Eight watersheds in Pennsylvania, draining areas of uniform climate and lithology, but different geologic structure, were studied for their geomorphic, geologic, hydraulic, and hydrologic characteristics.</p><p>Low streamflow characteristics, defined by base-flow recession curves, and streamflow …
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Pollutant Monitoring of Effluent Credit Trading Programs For Agricultural Nonpoint Source Control
… of existing effluent credit trading programs use watershed models and land use evaluation algorithms to indirectly monitor nonpoint source pollutant discharges on a watershed basis rather than relying on empirical sampling and analysis activities for individual farms of fields. Monitoring takes a …
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A Coupled Hydrologic-Economic Modeling Framework for Evaluating Alternative Options for Reducing Watershed Impacts in Response to Future Development Patterns
Economic input-output (I-O) and watershed models provide useful results but when seeking to integrate these systems, the structural, spatial, and temporal differences between these models must be carefully considered. To reconcile these differences, a hydrologic-economic modeling framework is …
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A Framework For Assessing Water Quality, Prioritizing Recovery Potential, And Analyzing Placement Of Best Management Practices
… (TN) and total phosphorus (TP) prediction models, evaluating the impact of social indicators on assessing recovery potential, and developing a spatial decision support system for choice and placement of best management practices (BMPS). An artificial neural network was used to develop TN …
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Changes in Streambank Erodibility and Critical Shear Stress Due to Surface Subaerial Processes
… assume constant values for soil erodibility. Watershed models and restoration designs should consider the implications of changing soil erodibility during the year in model development and stream restoration designs.
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Assessing environmental equivalents for water quality trading
… achieve water quality improvements in a watershed. The potential issues impeding WQT are its inability to address trading risks and quantify the uncertainty of potential load reduction in trades between PS and NPS. Recent research has also shown that trading information level and …
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Improving Predictions of Stormwater Quantity and Quality through the Application of Modeling and Data Analysis Techniques from National to Catchment Scales
… nutrient and sediment loads from developed watersheds is vitally important for meeting the impacts of urbanization. Today, stormwater events are characterized mainly by watershed models using little, if any, actual field monitoring data. The simple event mean concentration (EMC) wash-off …
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Sensitivity of Stormwater Management Solutions to Spatial Scale
… considerably altered natural hydrology of urban watersheds by increasing runoff volume, producing higher and faster peak flows, and reducing water quality. Efforts to minimize or avoid these impacts, for example by implementing low impact development (LID) practices, are gaining momentum. …
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Event-based hydrologic model calibration using NEXRAD in a data-poor region of southern New Jersey
Proper calibration of hydrologic models requires both reliable observed stream flow and precipitation data. Southern New Jersey has a notable lack of observed precipitation data, in particular, at the event scale; therefore model calibration represents a significant challenge. From a design …
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Enhanced Soil Moisture and Streamflow Estimation in Ungauged or Data-Scarce Watersheds
Watershed models are important tools for quantifying hydrologic processes and evaluating water management practices. These models simplify complex systems through parametrization and assumptions, particularly in semi-distributed frameworks like Soil and Water Assessment Tool (SWAT). Clear …
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Understanding the role of scale in assessing sediment and nutrient loads from Coastal Plain watersheds delivered to the Chesapeake Bay
… and sediment runoff loads from Coastal Plain watersheds. The overall goals of my dissertation are to assess the effect of urban and agricultural watershed on coastal waters through monitoring and modeling, and to characterize treatment performance of SCMs. These goals are addressed in four …
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Quantifying the Impact of Climate Change on Water Availability and Water Quality in the Chesapeake Bay Watershed
… gas (GHG) emissions. The Chesapeake Bay and its watershed are subject to the largest and most expensive Total Maximum Daily Load (TMDL) ever developed. It is unclear if the TMDL can be met given climate change and variability (e.g., extreme weather events). The objective of this dissertation is …