Journal of The Korean Society of Agricultural Engineers (한국농공학회논문집)

The Korean Society of Agricultural Engineers (한국농공학회)
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Assessment of Flood Impact on Downstream of Reservoir Group at Hwangryong River Watershed

황룡강 유역 저수지군 하류하천 영향평가

  • 황순호 (서울대학교 농업생명과학대학 생태조경.지역시스템공학부) ;
  • 강문성 (서울대학교 농업생명과학대학 조경.지역시스템공학부, 농업생명과학연구원) ;
  • 김지혜 (서울대학교 농업생명과학대학 생태조경.지역시스템공학부) ;
  • 송정헌 (서울대학교 농업생명과학대학 생태조경.지역시스템공학부) ;
  • 전상민 (서울대학교 농업생명과학대학 생태조경.지역시스템공학부) ;
  • 이상현 (서울대학교 농업생명과학대학 생태조경.지역시스템공학부) ;
  • 최진용 (서울대학교 농업생명과학대학 조경.지역시스템공학부, 농업생명과학연구원)
  • Received : 2012.04.30
  • Accepted : 2012.05.15
  • Published : 2012.05.31
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Abstract

Works for dam heightening plan have dual purposes: flood disaster prevention by securing additional storage volume and river ecosystem conservation by supplying stream maintenance flow. Now, the dam heightening project is in progress and there are 93 dam heightened reservoir. After the dam heightening project, 2.2 hundred million ton of flood control volume in reservoirs will be secured. Thus it is necessary to evaluate the effects of the dam heightening project on watershed hydrology and stream hydraulics, and resulting flood damages. This study was aimed to assess the impact of outflow from the dam heightened reservoir group on the Whangryong river design flood. The HEC-HMS (Hydrologic Engineering Center-Hydrologic Modeling System) model was used for estimating flood discharge, while HEC-5 (Hydrologic Engineering Center-5) was used for reservoir routing. This study analysed flood reduction effect on 100yr and 200yr return periods about the before and after heightening of agricultural dams. Based on the results of this study, the reduction of flood peak discharge at downstream of the reservoir group was estimated to be about 41% and 53% for 100yr and 200yr frequencies, respectively.

Keywords

References

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