GIS BASED LONG TERM HYDROLOGIC IMPACT EVALUATION FOR WATERSHED URBANIZATION1

Journal of the American Water Resources Association - Tập 39 Số 3 - Trang 623-635 - 2003
Jin‐Yong Choi1,2, Bernard A. Engel1,2, Suresh Muthukrishnan1,2, Jon Harbor1,2
1Assistant Professor, Department of Earth and Environmental Sciences, Furman University, Plyler Hall, 3300 Poinsett Highway, Greenville, South Carolina 29613
2Respectively, Post-Doctoral Research Fellow and Professor, Department of Agricultural and Biological Engineering, Purdue University, 225 South University Street, West Lafayette, Indiana 47907–2093

Tóm tắt

ABSTRACT: To adequately manage impacts of ongoing or future land use changes in a watershed, the magnitude of their hydrologic impacts needs to be assessed. A grid based daily streamflow model was calibrated with two years of observed streamflow data, using time periods when land use data are available and verified by comparison of model predictions with observed streamflow data. Streamflow data were separated into direct runoff and baseflow to estimate the impacts of urbanization on each hydrologic component. Analysis of the ratio between direct runoff and total runoff from 30 years of simulation results and the change in these ratios with urbanization shows that estimated annual direct runoff increased from 49.2 percent (1973) to 63.1 percent (1984) and 65.0 percent (1991), indicating the effects of urbanization are greater on direct runoff than on total runoff. The direct runoff ratio also varies with annual rainfall, with dry year ratios larger than those for wet years. This suggests that the impact of urbanization on areas that are sensitive to runoff ratios, such as stream ecosystems, might be more serious during drier years than in wetter years in terms of water quality and water yield. This indicates that sustainable base‐flow is important to maintaining sound stream ecosystems.

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Journal of the American Water Resources Association

Tập 39 Số 3

623-635

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