Evaluation of Nitrogen Nonpoint-source Loadings using High Resolution Land Use Data in a GIS: A Multiple Watershed Study for the State of Maryland.

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dc.contributor.advisorMoglen, Glenn Een_US
dc.contributor.authorAhmed, Sarah Naveeden_US
dc.contributor.departmentCivil Engineeringen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2008-10-11T05:52:46Z
dc.date.available2008-10-11T05:52:46Z
dc.date.issued2008-08-14en_US
dc.description.abstractThe performance of three monitoring perspectives, for the detection of watershed compliance with water quality standards, was evaluated. In order to compare performances 35 watershed nonpoint-source nitrogen loading cases were calculated within a GIS. Calculations showed that the probability of loads exceeding a criterion at the watershed outlet is more representative of upstream conditions than a nominal mean load comparison at the watershed outlet. Combined outlet compliance interpretations were found to isolate loading conditions that on average did not exceed the criterion; however, variations within loading distributions were large such that compliant conditions were threatened. The whole watershed perspective mapped the relationship between stream network structure, land cover/land use, and loadings. Comparisons between the perspectives suggested that both outlet perspectives usually are consistent with whole watershed conditions. Semivariograms were demonstrated to characterize spatial variability in loadings and predict the accuracy with which monitoring sites represent loads at upstream locations.en_US
dc.format.extent6076752 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/1903/8615
dc.language.isoen_US
dc.subject.pqcontrolledEngineering, Civilen_US
dc.subject.pquncontrolledland useen_US
dc.subject.pquncontrolledGISen_US
dc.subject.pquncontrolledloading ratesen_US
dc.subject.pquncontrollednonpoint sourceen_US
dc.subject.pquncontrollednitrogen loadingen_US
dc.subject.pquncontrolledMarylanden_US
dc.titleEvaluation of Nitrogen Nonpoint-source Loadings using High Resolution Land Use Data in a GIS: A Multiple Watershed Study for the State of Maryland.en_US
dc.typeThesisen_US

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