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 15 of 15 for “"diffuse pollution"”.
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The development of a strategic approach to managing diffuse pollution
This thesis explores how the concept of diffuse pollution, as developed by Novotny and Olem (1994), could usefully be applied in the UK and especially Scotland, to add insights and identify practical approaches to resolve chronic pollution problems. Investigations are reported that characterise the …
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Inverse modelling of diffuse pollution sources in the River Eden catchment
… data to drive a reduced complexity diuse pollution modelling framework (SCIMAP) to identify the areas most likely to be causing water quality problems. Results of inverse modelling showed arable land was a particular risky land use within the Eden catchment. Several areas (mainly …
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Linking sustainable drainage systems (SuDS) together with ecosystem services and disservices : new connections in urban ecology
Increased flooding, urban diffuse pollution and habitat fragmentation are predicted as the climate changes and urbanisation increases; all will affect human and wildlife well-being negatively. Sustainable drainage systems (SuDS) have the potential to mitigate these effects and also provide …
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The Influence of Trees on Soil Hydraulic Properties : Species Effects and the Provision of Ecosystem Services.
… and urban environments that may contribute to diffuse pollution and flooding. Despite this, our understanding of how trees affect soil hydraulic properties is still extremely limited. The main aims of the work outlined in this thesis were to compare the effect of a broadleaf (sycamore) and a …
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The agriculture-water interface : policy integration and the environment
… the loss of landscape and wildlife habitat and diffuse pollution of ground and surface water sources. The analysis concludes by outlining an alternative agenda of action for the Environment Agency which focuses on promoting synergy between state and market forces of regulation. Only through …
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Assessing the impacts of drought on groundwater resources in Scotland using the Eden catchment in northeast Fife as a case study
… is lowest to the east of the catchment with diffuse pollution from agriculture being more severe to the northwest occurring because of variations in land use and increased runoff. Another key finding is that current management practices in protecting groundwater resources at the Eden …
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Spatial and temporal water quality in the River Esk in relation to freshwater pearl mussels
… threat due to a variety of human activities; diffuse pollution, particularly in agricultural catchments, raises challenges to river environments. This work addresses the water quality in the River Esk (North York Moors National Park) and its impact on biodiversity, namely the rare, declining …
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Estimating minimum thresholds of natural vegetation for the integrated management and protection of water quality in South African catchments
… as a sink, thus protecting water resources from diffuse pollution, the preservation of an adequate amount within catchment areas is important. However, among several pertinent questions, it is not clear (1) how much natural vegetation cover is required, (2) at which scale(s) this would be most …
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Analysis and visualisation of digital elevation data for catchment management
… conducted an assessment of soil erosion and diffuse pollution risk in the study catchment using NEXTMap and OS 50 data with SCIMAP and RUSLE modelling techniques. Findings from the research demonstrate that a number of nationally available DEMs in the UK are simply not ‘fit for purpose’ as …
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Constructed treatment wetlands: Tools to attenuate diffuse agricultural pollution and enhance the biodiversity of eutrophic peat lake ecosystems
… prevalent as mitigation tools to manage diffuse pollution from agricultural runoff. However, discrepancies among studies of the performance of CTWs treating diffuse sources of N, P and SS have created uncertainty for end-users. As such, more field-based research is required to establish …
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Biogeochemistry of denitrifying bioreactors to enhance phosphorus removal from agricultural subsurface drainage
… environmental concern. In Aotearoa, agricultural pollution of freshwaters by nutrients is increasing. Therefore, strategies need to be implemented to minimize nutrient pollution in surface waters. Denitrifying bioreactors (DBRs) are a prominent edge-of-field treatment technology to mitigate …
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Quantifying Long-Term Hydrologic and NPS Pollutant Response in an Urbanizing Watershed
Long-term hydrologic and nonpoint source (NPS) pollutant response is quantified for four headwater basins of the Occoquan River in northern Virginia using 24 years of observed rainfall, basin discharge, water chemistry, and derived land use/land cover (LULC) data. Long-term summaries document that …
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The Legitimacy of Selected Watershed Organizations in the Midwestern United States
… have prevented better control of non-point, or diffuse, pollution off the landscape and into streams and lakes. One of the most cited requirements for legitimacy in natural resource collaborations is inclusive representation. An exploratory study of several watershed groups in Wisconsin and …
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Filamentous algae as a nutrient scrubber for agricultural drainage treatment
… on-farm treatment system to remove and recover diffuse nutrients from agricultural drainage water. FANS use attached filamentous algae that grow and assimilate nutrients from the water which are removed when algal biomass is harvested for beneficial use (e.g. biofertilizer, animal feed …
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Untersuchung und Modellierung der Stickstoff- und Phosphorumsatz- und Transportprozesse in mesoskaligen Einzugsgebieten des Tieflandes am Beispiel von Nuthe, Hammerfließ und Stepenitz
… haben ergeben, dass Nitrat überwiegend aus diffusen Quellen, Ammonium und Phosphat dagegen aus punktförmigen Quellen stammen. Als besonders sensitiv auf die Modellergebnisse haben sich die Parameter zu Landnutzung und -management und die Durchwurzelungstiefe der Pflanzen herausgestellt. …