The Spatial Distribution of Imperviousness in Watershed Hydrology

dc.contributor.advisorMoglen, Glenn E.en_US
dc.contributor.authorMejia, Alfonso Ignacioen_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.accessioned2009-10-06T06:08:36Z
dc.date.available2009-10-06T06:08:36Z
dc.date.issued2009en_US
dc.description.abstractUrbanization affects the hydrology of watersheds often leading to increases in runoff volumes and peak flows. These impacts are mainly attributed to the presence of imperviousness on the landscape which inhibits the soil infiltration process. Normally, these impacts are studied at the hillslope scale and under lumped watershed conditions. The impacts at the watershed scale under more spatially distributed conditions have been studied less. Advancements in spatial observations and techniques, distributed hydrologic modeling, and greater understanding of the importance of scale in hydrology have increased the feasibility and need for including spatial data sets and methods into hydrologic investigations. This dissertation focuses on understanding the role and importance of the spatial distribution of imperviousness in watershed hydrology. The spatial distribution of imperviousness is investigated by incorporating various spatial datasets, techniques, and modeling approaches that are used routinely for the hydrology of natural watersheds but less frequently for urbanized conditions. The distribution of imperviousness is investigated based on three approaches. The first approach uses optimization concepts to study where imperviousness can be placed in the watershed to reduce negative impacts on flooding. The second approach develops, implements, and tests a hydrologic event-based model to study the influence of the spatial distribution of imperviousness on the hydrologic response. The last approach relates analytically the space-time variability of rainfall, runoff, and the routing process to the imperviousness pattern, and synthesizes the complex space-time variations into a simpler framework. From the first approach distinct patterns of imperviousness were obtained that embodied water resources objectives. For example, the clustering of imperviousness along the main channel was found to globally reduce peak flows along the stream network. The second approach indicated that the overall imperviousness pattern can have a considerable impact on the hydrologic response. The last approach showed that the spatial patterns of rainfall and imperviousness can interact to increase or decrease the average amount of rainfall excess. The main contribution from this research is a larger understanding of the role of the spatial distribution of imperviousness in watershed hydrology. It also demonstrates the usefulness of applying hydrologic knowledge of natural watersheds to anthropogenically-altered watersheds.en_US
dc.format.extent3053315 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/1903/9558
dc.language.isoen_US
dc.subject.pqcontrolledHydrologyen_US
dc.subject.pqcontrolledEngineering, Civilen_US
dc.subject.pqcontrolledEngineering, Environmentalen_US
dc.subject.pquncontrolledHydrologyen_US
dc.subject.pquncontrolledImperviousnessen_US
dc.subject.pquncontrolledModelingen_US
dc.subject.pquncontrolledOptimizationen_US
dc.subject.pquncontrolledSpace-timeen_US
dc.subject.pquncontrolledUrbanizationen_US
dc.titleThe Spatial Distribution of Imperviousness in Watershed Hydrologyen_US
dc.typeDissertationen_US
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