Journal of The Korean Society of Agricultural Engineers (한국농공학회논문집)

The Korean Society of Agricultural Engineers (한국농공학회)
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A Comparative Study of Unit Hydrograph Models for Flood Runoff Estimation for the Streamflow Stations in Namgang-Dam Watershed

남강댐유역 내 주요 하천관측지점의 홍수유출량 추정을 위한 단위도 모형 비교연구

  • 김성민 (경상대학교 대학원 농공학과) ;
  • 김성재 (경상대학교 대학원 농공학과) ;
  • 김상민 (경상대학교 지역환경기반공학과(농업생명과학연구원))
  • Received : 2012.02.03
  • Accepted : 2012.05.14
  • Published : 2012.05.31
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Abstract

In this study, three different unit hydrograph methods (NRCS, Snyder and Clark) in the HEC-HMS were compared to find better fit with the observed data in the Namgang-Dam watershed. The Sancheong, Shinan, and Changchon in Namgang-Dam watershed were selected as the study watersheds. The input data for HEC-HMS were calculated land use, digital elevation map, stream, and watershed map provided by WAter Management Information System (WAMIS). Sixty six storms from 2004 to 2011 were selected for model calibration and validation. Three unit hydrograph methods were compared with the observed data in terms of simulated runoff volume, and peak runoff for the selected storms. The results showed that the coefficient of determination ($R^2$) for the peak runoff was 0.8295~0.9999 and root mean square error (RMSE) was 0.029~0.086 mm/day for calibration stages. In the model validation, $R^2$ for the peak runoff was 0.9061~0.9916 and RMSE was 0.030~0.088 mm/day which were more accurate than calibrated data. Analysis of variance showed that there was no significant difference among the three unit hydrograph methods.

Keywords

References

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