Abstract
The aim of this study is to evaluate prediction accuracy and sensitivity of a distributed hydrologic model. Accurate predictions of runoff are needed where reservoir operations are used to control flooding and to manage water resources. The study area consists of watershed areas that are influent to reservoirs in the 967 km2 Yongdam basin, and the 2,293 km2 Namgang basin located on the Korean Peninsula. For these basins with complex terrain, a physics-based distributed hydrologic model is set up with geospatial data, calibrated, and used to test sensitivity to accuracy of radar and rain gauge input and initial conditions. The events studied range in magnitude from 86 to over 249 mm and include two typhoons and two heavy rainfall events. Radar reflectivity is converted to rainfall rates using Z-R relationships, and then corrected for bias using a spatially variable correction derived from the rain gauge networks that cover both basins. Adjustment of assumed model parameters for the Namgang and Yongdam wate...
Published Version
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