Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Appropriateness analysis of design rainfall factors using the rainfall data of an inundated flood events

침수 홍수사상의 강우자료를 활용한 설계강우 요소의 적정성 분석

  • Yu, Byeong-Wook (Department of Civil & Environmental Engineering, Sejong University) ;
  • Kim, Seon-Ho (Department of Civil & Environmental Engineering, Sejong University) ;
  • Bae, Deg-Hyo (Department of Civil & Environmental Engineering, Sejong University)
  • 유병욱 (세종대학교 건설환경공학과) ;
  • 김선호 (세종대학교 건설환경공학과) ;
  • 배덕효 (세종대학교 건설환경공학과)
  • Received : 2020.01.29
  • Accepted : 2020.03.11
  • Published : 2020.04.30
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Abstract

The purpose of this study is to analyze whether design rainfall and hyetograph, which are the main elements of design rainfall, can properly reflect the those of observed rainfalls through inundated rainfall events. The target areas were selected at seven large cities with high damages regarding to the flooding. Comparative analysis between probability and observed rainfall shows that 57% of the cases, in which rainfall amount through the IDF curve is estimated lower than the observed rainfall, do not properly reflect the observed rainfalls. In particular, this trend is exacerbated by the cases in low return period and the rain type of typhoon or frontal rain. The comparative results of rainfall intensity formula showed that the Talbot and Japanese formula were stable in the short- and long-term return periods, respectively. The comparison of hyetograph results also showed that the Mononobe method properly reflects the maximum rainfall intensity and the Huff method properly reflects the shape of rainfall pattern.

본 연구의 목적은 실제 침수 강우자료를 활용하여 설계강우 주요 요소인 강우량 및 우량주상도가 실측 침수사상을 적절히 반영하는지 분석하는 것이다. 대상지역은 홍수발생 시 피해액이 높은 대도시 7곳을 선정하였다. 확률 강우량과 실측 강우량 비교분석 결과 IDF 곡선을 통한 강우량은 실측 강우사상의 총 강우량보다 낮게 산정되는 경우가 57%로 실측 강우의 강우량을 적절히 반영하고 있지 못한다고 판단되었다. 이러한 경향은 재현빈도가 저 빈도이며 호우 유형이 태풍 또는 전선성 호우일 경우 심해지는 것으로 나타났다. 강우강도 식별 강우량 비교결과 단기간에서는 Talbot 식, 장기간에는 Japanese 식이 안정적인 것으로 나타났다. 우량주상도 비교 결과 최대강우강도는 Mononobe 방법이 형태는 Huff 방법이 가장 적절히 반영하는 것으로 나타났다.

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