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 58 for “"point source pollution"”.
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Quantifying the Potential for Non-Point Source Pollution in Model Urban Landscapes
The contribution of non-point source pollution to degrading surface water quality is considerable throughout Virginia and beyond. While research on agricultural best management practices in nutrient management and nutrient and soil stabilization has made progress in reducing agricultural …
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Assessment and prediction of surface water vulnerability from non-point source pollution in Midwestern watersheds
<p>"Non-point source pollution is the leading cause of impairment in surface water in the Midwest. In this research, we seek to predict which watersheds are most vulnerable to point source pollution without field sampling using publically available GIS databases. Watersheds with higher …
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All it takes is a nudge: pushing environmental federalism to tackle the massive non-point source pollution problem
… the massive problem of excess nutrient pollution in America's most prominent waters through the Clean Water Act continues to challenge administrators both on the ground and in the courts. Widespread hypoxia in the Gulf of Mexico, impaired waterways in Florida, and a declining fishing …
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A framework for assessing viability of adoption of conservation practice for reducing nitrate-N
… to solve the ever-increasing problem of non-point source pollution. The impact of some practices on the environment, however, is not fully understood, and non-point source pollution continues to be a substantial source of contamination to our waterbodies. Most of the conservation practices …
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CLIMATE CHANGE IMPACTS ON THE SOIL EROSION AND NUTRIENT LOSSES IN THE GREAT LAKES REGION
Pollutants from non-point sources (NPS) have become the primary reason for water quality degradation in the Great Lakes region after great progress has been made in reducing point source pollution through the enforcement of total maximum daily loads (TMDL). Climate change may impact NPS pollutant …
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Assessing Urban Non-Point Source pollutants at the Virginia Tech Extended Dry Detention Pond
… understanding the characteristics of urban non-point source pollution has become a focus for water quality investigators. Once thought to be a small contributor to the pollution problem, urban non-point sources are now responsible for transporting over 50% of all pollutants into natural …
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Economic Analysis of Recapturing and Recycling Irrigation Techniques on Horticulture Nurseries
… horticulture industry is facing limited water resources and public pressure to reduce non-point source pollution. In some circumstances, recapturing and recycling of irrigation water in horticultural nurseries can generate significant savings relative to the costs of alternative water sources and …
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Acute Toxicity and Sub-Lethal Effects of Non-Point Source Pollutants on Invertebrates
Non-point source pollution is not generated from any single source, rather can arise from a mixture of agricultural, residential, and industrial activities. As a result of these activities millions of tons of chemicals enter into aquatic environments annually with the potential to disrupt the …
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Vector Zonal Operations for Spatiotemporal Analysis
… hourly or daily precipitation for use in non-point source pollution models and to explore the effects of antecedent precipitation on water quality samples. The case studies demonstrated the usefulness of the operations. A software tool, NexTool was also developed to process and build NEXRDA …
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The Impact of Urbanization on Macroinvertebrate Communities of Creeks Within Western Georgia
… integrity in a variety of ways. While control of point source pollution has largely improved over the last twenty years, the control of non-point source pollution has proved to be more of a challenge. Urbanization in the area surrounding streams has been linked with elevated levels of sediment, …
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A dynamic analysis of the crop productivity impacts of soil erosion: an application to the Piedmont area of Virginia
… toward optimizing the private use of the soil resource. In particular, four empirical representative farm models were formulated. Solutions to the four representative farm models showed that sizable reductions in topsoil loss, which contributes to non-point source pollution, and aggravates the …
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Investigation of Low Impact Development Practices For Coastal South Carolina: Oak Terrace Preserve
… stormwater and subsequent contributions of non-point source pollution to coastal water bodies (e.g., tidal creeks). State and local agencies have developed regulations to reduce the impact of stormwater and non-point source pollution on receiving waters through the use of stormwater Best …
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Patterns of intersex prevalence, vitellogenin, and reproductive condition in two commercially harvested fish along a pollution gradient in the Illinois River complex
… Illinois River in Illinois is characterized by a pollution gradient originating from highly urbanized and industrialized upstream sources that contain elevated levels of endocrine-disrupting chemicals (EDCs). Controlled exposures of fish to EDCs in laboratory have produced increased feminization …
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Impact of wastewater reuse in Burlington County on surface water quality and adjacent wetlands
… for irrigation but can be attributed to non-point source pollution. Concentrations of nutrients and bacteria were found to be similar and more often present in greater concentrations at Medford Lakes, indicating that there are additional factors influencing any effect the treated effluent may …
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Federal, state, and local government interactions in the administration of wetland protection measures in Virginia
… may be applied in other areas such as non-point source pollution control. A history of the development of the wetlands protection program is presented along with a description of applicable statutes, regulations, and permitting requirements. Included is an analysis of the implementation of …
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Skid Trail Stream Crossing Closure Techniques for Protecting Water Quality
… potential to produce sediment by way of non-point source pollution. The stream crossing portion of a skid trail is where sediment delivery is most likely to occur. Forestry Best Management Practices (BMPs) have been developed by most states to reduce both erosion and sedimentation. In …
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Precision Technologies for Small/Medium Sized Businesses Throughout the Beef Value Chain
… by the beef value chain; however, it is also a source of environmental concern due to contributions of leached nutrients to non-point source pollution. Precision technologies may help manage non-point source pollution. We explored the viability of two sensing systems in identifying defecation …
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Hydrologic modeling as a decision-making tool in wildlife management
… quality and quantity on and off site. Natural resource managers are coming under increasing pressure to preserve ecosystems and natural processes while producing a "optimum" balance of recreation, wildlife habitat, and natural resource products, and to justify their decisions. Water is a critical …
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Assessing Landowner Level Costs for Riparian Forest Buffer System Adoption on Farms in Virginia's Chesapeake Bay Watershed
Riparian Forest Buffer Systems contribute to non-point source pollution control and improve the physical and trophic qualities of streams. There is a limited understanding of the full range of costs incurred when implementing a RFBS. Establishment costs will vary with the site characteristics. The …
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