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http://dx.doi.org/10.3741/JKWRA.2015.48.3.209

Dam Effects on Spatial Extension of Flood Discharge Data and Flood Reduction Scale I  

Kim, Nam Won (Hydrology Research Div., Korea Institute of Construction Technology)
Jung, Yong (Civil and Environmental Engineering., Wonkwang University)
Lee, Jeong Eun (Hydrology Research Div., Korea Institute of Construction Technology)
Publication Information
Journal of Korea Water Resources Association / v.48, no.3, 2015 , pp. 209-220 More about this Journal
Abstract
In this study, the effects of changed environment on spatial extension of flood discharge data which is generating discharge data at ungauged watersheds. Especially, effects of dams on spatial extensions of flood discharge data and on natural flow generation were studied. This is somehow an intial trial of flood discharge data generation for heterogeneous watersheds because of dam installation. Data extensions have been performed based on the flood discharge data from YeoJoo water gauge station located on the Nam-Han River. For the evaluation of flood discharge data spatial extension under dam effects and producing natural flow, 41 flood events associated with YeoJoo water gauge station were selected from 1986 to 2010. When flood discharge data were extended based on YeoJoo water gauge station, 77% of selected flood events were over the satisfaction ranges (NSE>0.5) of Nash-Sutcliffe Efficiency for model validation. Extended flood discharge data at Yangpyung has 0.84 NSE obtained from spatial data extension based on YeoJoo water gauge station. Generated natural flow at YeoJoo was influenced strongly by Chungju Dam which has larger effects on streamflow at YeoJoo than Hoangsung Dam. Observed peak discharges after the 1986 of Chungju Dam installation were smaller than those of the obtained natural flow. Through these results, spatial extension of flood discharge data with installed dams works efficiently for ungauged watersheds and natural flow can be generated using extended flood discharge data.
Keywords
spatial extension of flood data; natural flow; dam effects; NSE;
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Times Cited By KSCI : 6  (Citation Analysis)
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