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 20 of 38 for “"watershed model"”.
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A sensitivity study on modeling hydrologic effects due to urbanization
During recent years the Standford Watershed Model has become a popular means of predicting the hydrologic response of land use changes. A special trial and adjustment model of the Kentucky version is available for determining best-fit values for the input parameters to the Watershed Model. This …
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Combining Gauge and Radar Derived Observations to Estimate Precipitation Input to A Watershed
<p>Watersheds are complicated systems that require sophisticated computer models to support environmental and water resource management decision making. For example, once a watershed model has been built and calibrated for a particular watershed system, it can be used to simulate different …
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Overarching framework to assess and enhance sustainability in multiple, integrated systems using System Dynamics
… A systems-level, overarching, integrated model coupled with underlying process models would provide structure to sustainability assessment of coupled systems, thereby making the procedure more effective. The first objective of the study is to illustrate such a systems-level, overarching, …
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Investigation of an integrated regional environmental watershed methodology
… on the health and current state of the regional watershed. The watershed has been defined as that area in which water flowing across and beneath a given land surface drains into a specific stream or river, ultimately flowing through a single point or outlet on that stream or river. Since the …
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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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Assessment of Predictive Real-Time Control Retrofits on Stormwater Basin Performance in an Urban Watershed
… increasing interest as hydraulic and hydrologic modeling capabilities proliferate. The benefits of incorporating precipitation forecast data into a RTC algorithm to allow for prediction-based control of an urban watershed is explored using an EPA SWMM 5.1 watershed model. One reactive and two …
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Three Dimensional Modeling Of Wekiva Springshed With Wash123d
… thesis presents a three-dimensional groundwater modeling of Wekia springshed in central Florida using a numerical model, WASH123D. Springs have historically played an important role in Florida's history. The Wekiva River is a spring-fed system associated with about 19 springs connected to the …
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The Challenges and Opportunities in Monitoring and Modeling Waterborne Pathogens in Water- and Resource-Restricted Africa: Highlighting the critical need for multidisciplinary research and tool advancement
… and transport. In this work, the Chobe River watershed in Northern Botswana serves as a target study site for the application of hydrological modeling tools to quantify emergent water quality and health challenges in Southern Africa. A watershed model with extensive data requirements, the …
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Evaluating least absolute deviation regression as an inverse model in groundwater flow calibration
… the US Geological Survey MODFLOW groundwater model works well with single layer geologic systems; however, it does not work well with multi-layer systems. This dissertation provides the Least sum Absolute Deviation regression and Expectation Maximization procedures. These new FORTRAN …
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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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Computer-based decision-support methods for hydrological ecosystem services management
… maximize hydrological ecosystem services at the watershed-scale in both agricultural and urban environments by integrating these algorithms with the watershed model Soil and Water Assessment Tool (SWAT), and the hydraulic model Storm Water Management Model (SWMM). This dissertation first develops …
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Simulation and assessment of highly altered hydrologic system responses to anthropogenic and natural stressors at the watershed scale
… long-term impacts on the ecosystem (EPA, 2017b). Watershed Management Practices (WMPs) are strategies intended to mitigate the impacts of environmental stressors at the watershed scale (Drake and Hogan, 2013). Examples of WMPs are riparian buffers, reduced tillage practice, filter strips, cover …
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Quantifying climate change impacts on future water resources and salinity transport in a high semi-arid watershed using the APEX-MODFLOW-Salt model
… hydrology and salinity transport and their total watershed yield in the Gunnison River Watershed (GRW) (14,608 km2), Colorado, using the APEX-MODFLOW-Salt hydro-chemical watershed model and three different CMIP5 climate models output downscaled by Multivariate Adaptive Constructed Analogs (MACA), …
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Infrastructure planning for drought mitigation under climate change
… based on a coupled simulation and optimization model. A quasi-physically based watershed model is established for Frenchman Creek Basin (FCB), where groundwater based irrigation plays a significant role in agriculture production and local hydrological cycle. The model, revised from the Soil and …
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Linking the effects of land use change with water quality and discharge: an integrated approach
… information systems (GIS) and water-quality modeling. Archived aerial photography proved to be a valuable source of historical land use data. GIS technology was used to compile and analyze spatial data. A comprehensive watershed model was used to link the effects of land use change to water …
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Modeling nitrogen transport with the ANSWERS model
… Numerous studies have indicated that, for many watersheds, a few critical areas are responsible for a disproportionate amount of the nutrient and sediment yield. Consequently, if pollution control activities are concentrated in these critical areas, then a far greater improvement in downstream …
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A Water Balance and Sediment Yield Analysis Model for the Lopez Lake Reservoir
… a water balance and sediment yield analysis model was developed for the reservoir’s watershed. The model was used to estimate evaporation from the lake and to examine the effects of a wildfire on the reservoir. Evaporation and wildfire are dependent on variables that change on a spatial and …
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A computer simulation model for predicting pesticide losses from agricultural lands
A field scale model for predicting the surface losses of pesticides (Pesticide Losses In Erosion and Runoff Simulator, PLIERS) was developed. PLIERS accounts for pesticide losses by degradation and volatilization, the washoff of pesticides from plant canopy and surface residue, the adsorption and …
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Simulation of Runoff and Pollutant Loss in Urbanizing Watersheds
… of urbanization on previously agricultural watersheds is an increasingly important issue for watershed planners. Urbanization increases runoff and pollutant loadings to the watershed outlet. Watershed planners in areas that previously had little impervious cover must now consider the effects …
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