Journal of The Korean Society of Agricultural Engineers (한국농공학회논문집)

The Korean Society of Agricultural Engineers (한국농공학회)
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Flood Inundation Analysis in a Low-lying Rural Area using HEC-HMS and HEC-RAS

HEC-HMS와 HEC-RAS를 이용한 농촌 저지대 침수해석

  • 김학관 ;
  • 강문성 (서울대학교 조경.지역시스템공학부, 농업생명과학연구원) ;
  • 송인홍 (서울대학교 농업생명과학연구원) ;
  • 황순호 (서울대학교 생태조경.지역시스템공학부 대학원) ;
  • 박지훈 (서울대학교 생태조경.지역시스템공학부 대학원) ;
  • 송정헌 (서울대학교 생태조경.지역시스템공학부 대학원) ;
  • 김지혜 (서울대학교 생태조경.지역시스템공학부 대학원)
  • Received : 2011.10.27
  • Accepted : 2012.02.02
  • Published : 2012.03.31
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Abstract

The objective of this study is to analyze the flood inundation in a low-lying rural area. The study watershed selected for this study includes the Il-Pae and Ahn-Gok watersheds. It is located in the Namyangju, Korea and encompasses $3.64km^2$. A major flood event that occurred in July 2011 was chosen as the case for the flood inundation analysis. The Hydrologic Engineering Center's Hydrologic Modeling System (HEC-HMS) and River Analysis System (HEC-RAS) were used to simulate flood runoff and water surface elevation at each cross-section, respectively. The watershed topographic, soil, and land use data were processed using the GIS (Geographic Information System) tool for the models. The contribution to the total flood volume was estimated based on the results simulated by HEC-HMS and HEC-RAS. The results showed that the overflow discharge from the Il-Pae stream constituted 80% of the total flood volume. The contributions of rainfall falling directly on the inundation area and overflow discharge from the Ahn-Gok stream were 15 % and 5 %, respectively. The simulation results in different levee scenarios for the Ahn-Gok stream were also compared. The results indicated that the levee could reduce the flood volume a little bit.

Keywords

References

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  1. Analysis of Flood Control Effects of Heightening of Agricultural Reservoir Dam vol.55, pp.4, 2013, https://doi.org/10.5389/KSAE.2013.55.4.083