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 89 for “"non point source"”.
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Agricultural non-point source (AGNPS) water quality modeling in a GIS environment
… database in order to undertake Agricultural Non-Point Source (AGNPS) water quality modeling. Three general areas of GIS technology were investigated consisting of technical issues involved in linking GIS; the model; database development; and a discussion of system performance from an …
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WATER QUALITY IMPACT OF NON-POINT SOURCE CONTAMINANTS IN SMALL TIDAL RIVERS
… methodology was developed for analysis of non-point contaminant production and water quality impacts in estuarine receiving waters. The methodology was calibrated against contaminant source observations and estuarine data.</p><p>Contaminant source loading is based on the runoff curve number …
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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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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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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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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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Evaluating non-point source microplastic pollution and its impact on biota in the Huron River
… transported into waterways through a myriad of sources, including point sources such as wastewater treatment plants (WWTPs) and nonpoint sources, such as runoff. Microplastics can act as vectors for other CECs, such as non-steroidal anti-inflammatory drugs (NSAIDs), into biota. The goal of this …
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Modeling and analysis of non-point source runoff and best management practice devices in Acton, MA
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1999.
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All it takes is a nudge: pushing environmental federalism to tackle the massive non-point source pollution problem
Controlling 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 …
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Association between Air Pollution and Cancer Incidence by region
… and cancer incidence ratio was negative when point source was only considered. But that was positive when exposure quantity was calculated by point and non-point source. CONCLUSION: This study found that NOx and PM10 were associated with cancer and that carcinogens by non-point source had …
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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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Design of a watershed-based nitrogen trading system or the Big and Little Wood Rivers Watershed
… costs, uncertainty in data collection and source monitoring, spatial and temporal distribution of pollutants, and enforcement of the trading program, are discussed. A water balance was completed in order to understand the hydrologic conditions of the Watershed. Water inflow for the …
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Historical Land Cover Impacts on Water Quality in the Provo River Watershed, 1975 - 2002
… land cover determines the type and quantity of non-point source (NPS) pollutants that may enter the water. This study examines the historical impacts of land cover changes on water quality in the Provo River using remote sensing and statistical analysis. Statistical correlations and linear …
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Testing the use of the BASINS PLOAD model to simulate the quality of stormwater runoff from the Kuils River catchment, Cape Town
… adversely affecting the quality of freshwater resources. Total phosphorus and total suspended solids represent two forms of pollutants that are commonly found in non point source discharge...This study evaluated water quality modelling as an alternative monitoring technique. The study was aimed …
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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 …
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The impact of environmental change on the Tualatin River cleanup — a case study of policy responses to climate change
… ""watershed approach,"" developed to improve non-point source water quality management. The Clean Water Act itself does not provide the same rigorous regulatory structure for non-point source pollution as it does for point source pollution. In the Tualatin Basin, point source controls for …
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Hydrologic and water quality modeling with HSPF : utilization of data from a novel field data collection system and historical archives
… interesting physical characteristics and various non-point source water quality issues that warrant a modeling investigation to characterize the hydrology of this large and heavily utilized water resource. Model inputs include 1) a thorough set of Geographic Information System (GIS) files utilized …
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