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Application of Flood Discharge for Gumgang Watershed Using GIS-based K-DRUM  

Park, Jin-Hyeog (한국수자원공사 K-water연구원)
Hur, Young-Teck (한국수자원공사 물관리센터)
Publication Information
Journal of Korean Society for Geospatial Information Science / v.18, no.1, 2010 , pp. 11-20 More about this Journal
Abstract
The distributed rainfall-runoff model which is developed in the country requires a lot of time and effort to generate input data. Also, it takes a lot of time to calculate discharge by numerical analysis based on kinematic wave theory in runoff process. Therefore, most river basins using the distributed model are of limited scale, such as small river basins. However, recently, the necessity of integrated watershed management has been increasing due to change of watershed management concept and discharge calculation of whole river basin, including upstream and downstream of dam. Thus, in this study, the feasibility of the GIS based physical distributed rainfall-runoff model, K-DRUM(K-water hydrologic & hydraulic Distributed RUnoff Model) which has been developed by own technology was reviewed in the flood discharge process for the Geum River basin, including Yongdam and Daecheong Dam Watersheds. GIS hydrological parameters were extracted from basic GIS data such as DEM, land cover and soil map, and used as input data of the model. Problems in running time and inaccuracy setting using the existing trial and error method were solved by applying an auto calibration method in setting initial soil moisture conditions. The accuracy of discharge analysis for application of the method was evaluated using VER, QER and Total Error in case of the typhoon 'Ewiniar' event. and the calculation results shows a good agreement with observed data.
Keywords
K-DRUM; Kinematic wave; Initial soil moisture; Auto calibration; Baseflow;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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