Journal of Wetlands Research (한국습지학회지)

Korean Wetlands Society (한국습지학회)
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Estimation of Design Flood Discharge by Areal Ratio for Ungauged Basin

면적비를 적용한 미계측유역에서의 설계홍수량 산정방안

  • Lee, Jiho (Department of Civil Engineering, Seoul Nation University of Science and Technology) ;
  • Park, Jaebeom (Daon Solution) ;
  • Song, Yangho (Department of Civil & Environmental Engineering, Hanbat National University) ;
  • Jun, Hwandon (Department of Civil Engineering, Seoul Nation University of Science and Technology) ;
  • Lee, Jungho (Department of Civil & Environmental Engineering, Hanbat National University)
  • 이지호 (서울과학기술대학교 건설시스템디자인) ;
  • 박재범 ((주) 다온솔루션) ;
  • 송양호 (한밭대학교 건설환경공학과) ;
  • 전환돈 (서울과학기술대학교 건설시스템디자인) ;
  • 이정호 (한밭대학교 건설환경공학과)
  • Received : 2017.08.09
  • Accepted : 2017.08.18
  • Published : 2017.08.31
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Abstract

In this study, We proposed a method to estimate the design flood by area ratio in an ungauged basin. For that, the discharge parameters was determined by calibration of observed data at the watershed outlet and then peak flow was estimated by area ratio. In order to verify suggested method, peak flow was compared the observed discharge of the small river basin and the design flood discharge of river implementation projects. The results were summarized as follows. As a result of comparing the discharge by the area ratio and observed discharge, the difference of peak flows were analysed 14 ~ 25%. When the discharge calculated with area ratio of small river was compared with the design flood discharge of river implementation projects, the relative error was analyzed to be less than 20%. It means that suggested method in this study is appropriate.

본 연구에서는 미계측유역의 설계홍수량을 산정하는 방안으로 유역의 면적비를 적용하는 방안을 제안하였다. 이를 위해 유역출구에서의 실측자료를 활용하여 유출매개변수를 결정하고 면적비를 적용하여 첨두홍수량을 산정하였다. 위 방법론을 검증하기 위해 소하천 유역의 관측유량 및 하천정비종합계획의 설계홍수량과의 비교를 통해 면적비 전이 방법론의 타당성을 검토하였다. 그 결과를 정리하면 다음과 같다. 면적비를 적용한 유출량과 관측유량자료를 비교한 결과 14~25% 정도의 차이를 보였다. 제안된 방법론의 타당성을 재확인하기 위해 하천정비종합계획에서 산정된 첨두유량과 소유역과의 면적비로 계산한 첨두유량을 비교하였다. 이를 위해 31개소의 소하천을 대상으로 설계홍수량을 비교한 결과, 20% 정도의 홍수량의 차이가 발생하였다. 따라서 면적비를 적용한 미계측지역에서의 첨두유량 산정방법론이 타당하다고 판단된다.

Keywords

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