Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Retrospective analysis of the urban inundation and the impact assessment of the flood barrier using H12 model

H12 모형을 이용한 도시침수원인 및 침수방어벽의 효과 분석

  • Kim, Bomi (Department of Civil Engineering, Kumoh National Institute of Technology) ;
  • Noh, Seong Jin (Department of Civil Engineering, Kumoh National Institute of Technology) ;
  • Lee, Seungsoo (Water and Land Research Group)
  • 김보미 (금오공과대학교 토목공학과) ;
  • 노성진 (금오공과대학교 토목공학과) ;
  • 이승수 (한국환경연구원 물국토연구본부)
  • Received : 2022.03.07
  • Accepted : 2022.04.06
  • Published : 2022.05.31
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Abstract

A severe flooding occured at a small urban catchment in Daejeon-si South Korea on July 30, 2020 causing significant loss of property (inundated 78 vehicles and two apartments) and life (one casualty and 56 victims). In this study, a retrospective analysis of the inundation event was implemented using a physically-based urban flood model, H12 with high-resolution data. H12 is an integrated 1-dimensional sewer network and 2-dimensional surface flow model supported by hybrid parallel techniques to efficiently deal with high-resolution data. In addition, we evaluated the impact of the flooding barriers which were installed after the flood disaster. As a result, it was found that the inundation was affected by a combination of multiple components including the shape of the basin, the low terrain of the inundation area located in the downstream part of the basin, and lack of pipe capacity to drain discharge from the upstream during heavy rain. The impact of the flooding barriers was analyzed by modeling with and without barriers on the high-resolution terrain input data. It was evaluated that the flood barriers effectively lower the water depth in the apartment complex. This study demonstrates capability of high-resolution physically-based urban modeling to quantitatively assess the past inundation event and the impact of the reduction measures.

2020년 7월 30일 대전광역시 서구 A 아파트에서 새벽에 발생한 집중호우로 차량 78대와 아파트 2개 동이 침수되어, 사망 1명, 이재민 56명의 피해가 발생하였다. 본 연구에서는 1차원 관거-2차원 지표 흐름(1D-2D) 통합 해석 모형인 H12 모형과 고해상도 지표면 자료를 이용하여 침수 사상을 재현하고, 원인을 분석하였다. 또한, 침수 재해 발생 이후 A 아파트 주위에 설치된 침수방어벽의 침수 방어 효과를 분석하였다. 분석 결과, 좁고 가파른 유역형상, 주변 대비 고도가 낮은 대상 지역의 지형적 요인과 폭우로 인해 상류로부터 급속히 발생한 유출이 하류 저지대에서 배수되지 못해 발생한 침수 재해로 분석되었다. 침수방어벽의 효과를 분석하기 위해 고해상도 지표면 입력자료를 변경하여 침수방어벽 설치 전후를 모의하여 비교한 결과, 설치 후 A 아파트 단지 내 침수 수위가 낮아져 홍수 저감효과가 뛰어난 것으로 평가되었다. 본 연구를 통해 초고해상도 물리 기반 모형을 이용한 침수 원인 분석 및 저감 대책의 정량적 평가가 가능함을 확인하였다.

Keywords

Acknowledgement

이 성과는 한국환경연구원의 2022년도 기본과제 「기후위기 대응을 위한 도시침수 관리 정책 개선방안 연구(RE2022-15)」와 정부(과학기술정보통신부)의 재원으로 한국연구재단(NRF-2020R1C1C1005099)의 지원을 받아 수행된 연구임.

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