Journal of The Korean Society of Agricultural Engineers (한국농공학회논문집)

The Korean Society of Agricultural Engineers (한국농공학회)
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Flood Runoff Estimation for the Streamflow Stations in Namgang-Dam Watershed Considering Forest Runoff Characteristics

산림지역의 유출특성을 고려한 남강댐유역내 주요 하천관측지점에 대한 홍수유출량 추정

  • 김성재 (경상대학교 지역환경기반공학과(농업생명과학연구원)) ;
  • 박태양 (경상대학교 지역환경기반공학과(농업생명과학연구원)) ;
  • 장민원 (경상대학교 지역환경기반공학과(농업생명과학연구원)) ;
  • 김상민 (경상대학교 지역환경기반공학과(농업생명과학연구원))
  • Received : 2010.10.14
  • Accepted : 2010.11.09
  • Published : 2010.11.30
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Abstract

The objective of this study is to estimate the flood runoff for three guaged stations within Namgang-Dam watershed which are operated by KWATER. For a flood runoff simulation, HEC-HMS was applied and the simulated runoff was compared with observed from 2004 to 2008. The watershed area of Sancheong, Shinan, and Changchon were 693.6 $km^2$, 413.4 $km^2$, and 346.48 $km^2$, respectively. The average runoff ratio of observed runoff for three watersheds were 0.725, 0.418, and 0.586, respectively. The dominant land cover of three watersheds are forest with the value of 71.6 %, 73.1 %, and 82.0 %. Three different cases according to the potential maximum retention of forest areas for calculating the curve number were applied to decrease the error between the simulated and observed. The simulated peak runoff of case 3 which applied the 90 % of potential maximum retention of curve number which is equivalent to AMCI for all the AMCI, AMCII, and AMCIII conditions showed least root mean square error (RMSE). The case 1, which was suggested by previous study, showed high discrepancy between the simulated and observed. Since the forest area consists of more than 70 % for all three watersheds, the application of curve number for forest is critical to improve the estimation errors. Further research is required to estimate the more accurate curve number for forest area.

Keywords

References

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  1. A Comparative Study of Unit Hydrograph Models for Flood Runoff Estimation for the Streamflow Stations in Namgang-Dam Watershed vol.54, pp.3, 2012, https://doi.org/10.5389/KSAE.2012.54.3.065