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2025 Vol.58, Issue 5 Preview Page

Research Article

Improvement of rainfall temporal distribution method to reduce the frequency discrepancy between design rainfall and designed flood discharge

확률강우량과 설계홍수량 빈도의 불일치 개선을 위한 강우시간분포 방법 개선 연구

Jin-Young Kima
,
Hyun-Soo Kimb
,
Gi-Hyun Parkc
,
Su-bin Jeongd
,
Hyun-Han Kwone*
김 진영a
,
김 현수b
,
박 기현c
,
정 수빈d
,
권 현한e*
aResearch Professor, Department of Civil and Environmental Engineering, Sejong University, Seoul, Korea
bMaster Course, Department of Civil and Environmental Engineering, Sejong University, Seoul, Korea
cMaster Course, Department of Civil and Environmental Engineering, Sejong University, Seoul, Korea
dMaster Course, Department of Civil and Environmental Engineering, Sejong University, Seoul, Korea
eProfessor, Department of Civil and Environmental Engineering, Sejong University, Seoul, Korea
a세종대학교 건설환경공학과 연구교수
b세종대학교 건설환경공학과 석사과정
c세종대학교 건설환경공학과 석사과정
d세종대학교 건설환경공학과 석사과정
e세종대학교 건설환경공학과 교수
*Corresponding Author
31 May 2025. pp. 439-448
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Abstract

The most accurate way to estimate design flood volume is through flood frequency analysis based on stage-discharge gauging data. However, due to limited gauging stations in Korea, ungauged watersheds rely on rainfall-runoff models, which often yield results differing from direct frequency analysis. This discrepancy arises from assuming design rainfall and design flood share the same frequency and the smoothing effect of rainfall temporal distributions. This study identifies the underestimation issue in the commonly used Huff distribution and proposes an improved Blocking method for deriving design rainfall hyetographs. The proposed approach, similar to the Blocking method but incorporating statistical techniques, ensures frequency consistency and adapts to various rainfall patterns. Results show improved accuracy, aligning closely with direct frequency analysis, enhancing its practical applicability in hydrological design.

Keywords
Temporal distribution
Design rainfall
Design flood
Frequency discrepancy

설계홍수량은 일반적으로 수위-유량 관측소에서 기록된 자료를 활용하여 직접 홍수빈도해석을 수행하는 것이 가장 정확하다. 그러나 국내에서는 물리적, 재정적 여건상 주요 지점에서만 수위-유량 관측소가 운영되고 있어, 미계측 유역에서는 강우-유출 모형을 통해 간접적으로 설계홍수량을 추정하는 방법이 사용된다. 하지만 이러한 간접 추정 방식은 홍수빈도해석을 통해 얻어진 설계홍수량과 차이가 발생하는 단점이 있다. 이는 설계강우량의 빈도와 설계홍수량의 빈도가 동일하다는 가정과 함께 평활화된 강우 시간분포 등에서 비롯된 것으로, 이로 인해 설계 강우 빈도와 설계 홍수 빈도 간의 불일치가 발생한다. 이에 본 연구에서는 우리나라에서 일반적으로 사용되는 Huff 분포 산정 결과가 과소 추정되는 문제를 지적하고, 이를 보완할 수 있는 설계강우량 우량주상도의 산정 방법을 제시하였다. 제시된 방법은 기존 Blocking 방법과 유사하지만, 통계적 기법을 활용해 설계강우량의 빈도를 보장하면서 다양한 강우 패턴에 적용 가능한 우량주상도를 산정할 수 있는 개선된 Blocking 모형을 제시하였다. 그 결과 Huff 분포에서 제기된 단점이 보완 가능하였으며, 직접빈도해석과 유사한 결과 도출할 수 있는 가능성을 확인하여 실무에 활용이 가능할 것으로 판단된다.

키워드
우량주상도
설계강우량
설계홍수량
빈도 불일치
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Information
  • Publisher :KOREA WATER RESOURECES ASSOCIATION
  • Publisher(Ko) :한국수자원학회
  • Journal Title :Journal of Korea Water Resources Association
  • Journal Title(Ko) :한국수자원학회 논문집
  • Volume : 58
  • No :5
  • Pages :439-448
  • Received Date : 2025-02-06
  • Revised Date : 2025-03-27
  • Accepted Date : 2025-03-27
  • DOI :https://doi.org/10.3741/JKWRA.2025.58.5.439
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