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 “"headwater catchments"”.
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Environmental Flow Determination in Headwater Catchments of Luvuvhu River in Limpopo Province, South Africa
… in data-scarce, ecologically sensitive headwaters remains uneven and/or underdeveloped. This study addresses the absence of defensible environmental flow requirements (EFRs) in the upper Luvuvhu River Catchment, a biodiversity-rich yet hydrologically compromised system within the Vhembe …
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Evaluating the effects of hydrogeologic processes on the fate of salinity and halogens in headwater catchments
… the controls on the movement of solutes through catchments, is essential to providing accurate assessments of how future environmental stressors (e.g. land cover, population growth, and climate change) may affect water resources. </p> <p>Halogens (specifically, chloride (Cl), bromide (Br), and …
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A Hydropedological Approach to Describing Runoff Generation, Lateral Podzolization, and Spatial and Temporal Patterns of DOC in a Headwater Catchment
… discharge and water chemistry among and within headwater catchments are not well understood. Developing a better understanding of the processes that control these variations is crucial to determining how headwater catchments will respond to changes in climate and land use. This dissertation …
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Susceptibility Of Headwater Catchment Hydrology To Persistent Droughts And Forest Structure Modification - A Plot To Catchment Scale Analysis
Headwater catchments across the Western United States are critical environments to natural ecosystems and are a vital component of water resources to many communities and industries and may be strongly affected by changing climate and altered disturbance regimes. To better quantify how these …
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Impacts of Climate Change in Snowmelt-Dominated Alpine Catchments: Development and Assessment of Comparative Methods to Quantify the Role of Dynamic Storage and Subsurface Hydrologic Processes
… assess the physical and chemical response of headwater systems to climate change. This dissertation builds upon previous work by using long-term data from two snowmelt dominated catchments to investigate the response of hydrologic processes at different temporal and spatial scales. First, …
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Ecological Benefits of Mitigation on a Large River Mainstem in an Intensively Mined Appalachian Watershed
… Appalachians causes significant alteration of headwater catchments, and these impacts may be offset through implementation of stream restoration projects. As an example, several habitat enhancement structures (cross-vanes and j-hooks) were constructed along a 13.7 km section of the Little Coal …
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The influence of urbanization on runoff generation and stream chemistry in Massachusetts watersheds
… on stream nutrient concentrations in headwater catchments in Massachusetts. In addition, I evaluate the importance of surface versus subsurface flow paths during rainfall events in stormflow generation in a small urban catchment. The percentage of residential land explains 52% of the …
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Digital terrain analysis to predict soil spatial patterns at the Hubbard Brook Experimental Forest
… 1-10 m) soil and hydrological variability of headwater catchments may require higher-resolution data that has only recently become available, and both DEM accuracy and the effects of different high-resolution DEMs on topographic metrics are relatively unknown. This study has two principle …
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The interacting hydrologic responses to changing climate, watershed physical characteristics, river regulation, and land development in the northeastern United States
… sub-basins and earlier discharge in smaller headwater catchments. Annual discharge responded to increases in annual precipitation regardless of river regulation or land development. In general, the temporal trends showed greater decreasing trends in discharge under dry and greater increasing …
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Occurrence of Pharmaceuticals and Personal Care Products (PPCP) & Artificial Sweeteners (AS) in Surface Waters of Maryland's Chesapeake Bay Western Shore
… three seasons in 2021 at 79 sites, including headwater streams, groundwater, and rivers feeding into the Chesapeake Bay. Sites were influenced by a mix of wastewater treatment plants (WWTP) and onsite wastewater treatment systems (OWTS). The detection frequency of the study compounds ranged …
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The controls of watershed nutrient export
… changes with increased urbanization in small headwater catchments in northeastern Massachusetts, USA. Water runoff, N loading, and N exports were higher in an urban compared to a forested site. N exports increased at a faster rate than N loading, indicating that the capacity of urban …
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Measuring and Understanding Effects of Prescribed Fire in a Headwater Catchment
Headwater catchments play a large role in the storage and release of water and chemical constituents, thereby influencing downstream flows and water quality. Recent advances in water quality monitoring technologies have created an opportunity to better assess water chemistry variation by using high …
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Hydrological modeling of mountain catchments in Central Asia
… causes of observed streamflow increases in two headwater catchments of the Tarim River over the recent decades. This simulation-based approach for trend attribution was complemented by a data-based approach. The hydrological model was calibrated to discharge and glacier mass balance data and …
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Logging impacts the ecology of molecules in headwater streams
… and hillslope positions in four replicate forest headwater catchments of the Canadian hardwood forest. I related DOM composition to soil microbiomes and physical chemistry to establish baseline conditions before a harvest experiment. I found that DOM changed similarly along soil-aquatic gradients, …
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Analysis and management of low flows in small catchments of Brandenburg, Germany
… that future decrease in runoff is likely for catchments in Brandenburg, Germany. Depending on the first-order controls on low flows, different adaption measures are expected to be appropriate. Small catchments were analyzed because they are expected to be more vulnerable to a changing climate …
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Measurement and modelling of water and sediment fluxes in meso-scale dryland catchments
… (Sediment Export from large Semi-Arid catchments: Measurements and Modelling). As a part of this project, this thesis focuses on (1) the development and implementation of an erosion module for a meso-scale catchment model, (2) the development of upscaling and generalization methods for …