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Evaluation of Hydrological Impacts Caused by Land Use Change  

Park, Jin-Yong (Purdue University, Post Doctoral Researcher)
Publication Information
Magazine of the Korean Society of Agricultural Engineers / v.44, no.5, 2002 , pp. 54-66 More about this Journal
Abstract
A grid-based hydrological model, CELTHYM, capable of estimating base flow and surface runoff using only readily available data, was used to assess hydrologic impacts caused by land use change on Little Eagle Creek (LEC) in Central Indiana. Using time periods when land use data are available, the model was calibrated with two years of observed stream flow data, 1983-1984, and verified by comparison of model predictions with observed stream flow data for 1972-1974 and 1990-1992. Stream flow data were separated into direct runoff and base flow using HYSEP (USGS) to estimate the impacts of urbanization on each hydrologic component. Analysis of the ratio between direct runoff and total runoff from simulation results, and the change in these ratios with land use change, shows that the ratio of direct runoff increases proportionally with increasing urban area. The ratio of direct runoff also varies with annual rainfall, with dry year ratios larger than those for wet years shows that urbanization might be more harmful during dry years than abundant rainfall years in terms of water yield and water quality management.
Keywords
Hydrological impact analysis; Hydrological model; Land use change; Urbanization;
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