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DEM Based Urban Inundation Analysis Model Linked with SWMM

SWMM을 연계한 DEM기반의 도시침수해석 모형

  • Lee, Chang-Hee (Dept. of Digital City, Seoul Development Institute) ;
  • Han, Kun-Yeun (Dept. of Civil Engrg., Kyungpook National Univ.) ;
  • Choi, Kyu-Hyun (River Information Center, Han River Flood Control Office, MOCT)
  • 이창희 (서울시정개발연구원 디지털도시부) ;
  • 한건연 (경북대학교 공과대학 토목공학과) ;
  • 최규현 (건설교통부 한강홍수통제소 하천정보센터)
  • Published : 2006.05.01

Abstract

Recently the natural damage associated with flood disaster has been dramatically increased. Especially, inundation in the urban area causes serious damage to people and assets because of the concentration of infrastructure and population growth. The purpose of this study is to develop a new urban inundation model combining a storm sewer system model and a 2D overland-flow model for the estimation inundation depth In urban area caused by the surcharge of storm sewers. The movement of water in the studied urban watershed is characterized by two components, namely, the storm sewer flow component and the surcharge-induced inundation component. The model was applied to Goonja and Jangan catchments. Inundated depths were presented to demonstrate model simulation results. The simulation results can help the authority decide preventing flood damages by redesigning and enlarging the capacities of storm sewer systems in the inundation-prone areas. The model can also be applied to make the potential inundation area map and establish flood-mitigation measures as a part of the decision support system for flood control authority.

최근에 홍수재해와 관련된 자연재해가 급격히 증가하고 있다. 특히, 사회기반시설의 집중 및 인구증가로 도시지역에서의 침수는 인명과 재산에 큰 피해를 야기한다. 본 연구의 목적은 배수시스템에서의 과부하로 인한 도시지역에서의 침수심을 계산하기 위해서 우수배수시스템모형과 2차원 지표류모형을 연계한 새로운 모형을 개발하는 것이다. 대상유역에서의 침수유량의 거동은 두 가지 요소로 고려되는데 하나는 배수시스템에서의 흐름이고 다른 하나는 월류유량으로 발생한 범람 흐름으로 고려되어 졌다 개발모형은 군자와 장안유역에 적용되었고, 계산된 침수심들은 모의결과로 제시되었다. 모의 결과는 홍수관계기관이 침수 발생이 예상되는 지점에서 홍수피해 방지를 위해 배수시스템의 용량에 대한 재설계 혹은 확장 등과 같은 대책을 수립하는데 도움을 줄 수 있다. 또한, 본 모형은 홍수관계기관에서의 정책결정에 활용될 수 있도록 침수위험지도를 만들고 홍수경감대책을 수립하는데 이용될 수 있다

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