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A study of Spatial Multi-Criteria Decision Making for optimal flood defense measures considering regional characteristic

지역특성을 고려한 홍수방어대안 제시를 위한 공간 다기준의사결정 기법 적용 방안 연구

  • Lee, Eunkyung (Department of Civil and Transportation Engineering, Ajou University) ;
  • Ji, Jungwon (Department of Civil and Transportation Engineering, Ajou University) ;
  • Yi, Jaeeung (Department of Civil Systems Engineering, Ajou University)
  • 이은경 (아주대학교 건설교통공학과) ;
  • 지정원 (아주대학교 건설교통공학과) ;
  • 이재응 (아주대학교 건설시스템공학과)
  • Received : 2017.11.20
  • Accepted : 2018.01.11
  • Published : 2018.04.30

Abstract

Recently, the flood inundation caused by heavy rainfall in urban area is increasing due to global warming. The variability of climate change is described in the IPCC 5th report (2014). The precipitation pattern and hydrological system is varied by climate change. Since the heavy rainfall surpassed the design capacity of the pipeline, it caused great damage in metropolitan cities such as Seoul and Busan. Inundation in urban area is primarily caused by insufficient sewer capacity and surplus overflow of river. Inundation in urban area with concentrated population is more dangerous than rural and mountains areas, because it is accompanied by human casualties as well as socio-economic damage to recover destruction of roads, brides and underground spaces. In addition, various factors such as an increase in impervious area, a short time of concentration to outlet, and a shortage of sewer capacity's lack increase flooding damage. In this study, flood inundation analysis was conducted for vulnerable areas using XP-SWMM. Also, three structural flood prevention measures such as drainage pipeline construction, detention reservoir construction, and flood pumping station construction are applied as flood damage prevention alternatives. The flood data for each alternative were extracted by dividing the basin by grid. The Spatial Compromise Programming are applied using flood assessment criteria, such as maximum inundation depth, inundation time, and construction cost. The purpose of this study is to reflect the preference of alternatives according to geographical condition even in the same watershed and to select flood defense alternative considering regional characteristics.

지구 온난화가 심화됨에 따라 도시지역에서 집중호우에 의한 침수 피해가 증가하는 추세이다. 이러한 지구온난화에 의한 기후변화의 변동성은 IPCC 5차 보고서(2014)에서도 기술되어 있으며 기후변화에 의한 강수 패턴의 변화, 수문시스템의 변화 등 수자원 불확실성의 증가에 대하여 시사하고 있다. 최근 서울이나 부산과 같은 대도시의 관로의 수용 범위를 초과하는 국지성 호우가 발생하여 큰 피해를 초래하였다. 도시지역의 침수는 1차적으로 우수관거 통수능 부족에 의한 내수범람이 발생하고 방류구와 인접한 하천의 외수범람이 발생한다. 인구가 밀집되어 있는 도시지역에서 발생하는 침수는 인명피해 뿐만 아니라 도로, 교량, 지하공간 침수 및 파괴를 복구하기 위한 사회 경제적 피해를 동반하기 때문에 농촌, 산지 지역에 비해 피해량이 크다. 또한 도시개발에 인한 불투수면적 증가, 강우 유출시 출구부까지의 짧은 도달시간, 배수시설의 통수능부족 등 다양한 원인이 침수피해를 증대시킨다. 본 연구에서는 집중호우에 취약한 지역을 선정하고 XP-SWMM을 이용하여 내수침수 모의를 실시하였다. 또한 시범지역에 관로 개량, 우수저류지 설치, 우수펌프장 설치와 같은 홍수방어대안을 적용하여 각각의 침수모의를 실시하였으며 해당유역을 격자별로 분할하여 대안별 침수데이터를 추출하였다. 또한 격자별로 가장 적합한 구조적 홍수방어대안을 제시하기 위해 침수시간, 최대침수심, 구조물 설치비용을 평가요소로 이용하였으며 MCDM 기법 중 하나인 Compromise Programming 기법을 적용하였다. 본 연구에서는 동일 유역이라도 지리적 여건에 따라 대안의 선호도가 다르다는 점을 반영하고자 하였으며, Spatial Multi-Criteria Decision Making을 적용하여 지역특성을 고려한 홍수방어대안을 선정하는 방법에 대하여 연구하였다.

Keywords

References

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