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2024 Vol.57, Issue 12S Preview Page

Research Article

Network characteristics and Its Impact on flooding in urban catchments: a case study in Seoul, South Korea

배수관망의 특성과 홍수사상의 관계: 서울시 배수관망 특성을 중심으로

Yongwon Seoa
,
Kyung Jae Kimb
,
Woo Chang Jeongc*
서 용원a
,
김 경재b
,
정 우창c*
aProfessor, Department of Civil Engineering, Yeungnam University, Gyeongsan, Korea
bManager, Department of Water Resources, Isan Co. Ltd., Anyang, Korea
cProfessor, Department of Civil Engineering, Gyeongnam University, Changwon, Korea
a영남대학교 공과대학 건설시스템공학과 교수
b(주)이산 수자원부 과장
c경남대학교 공과대학 토목공학과 교수
*Corresponding Author
31 December 2024. pp. 1221-1230
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Abstract

This study applied the Gibbs‘ Model to 237 drainage areas in Seoul, defined by sewer sub-basin boundaries, to determine the Gibbs’ Model coefficient (β). Using Seoul's sewer network and terrain data, the actual drainage network was restructured into an orthogonal grid for model application. The analysis revealed that regions with a lower β value (indicating lower drainage efficiency) were more common than those with higher values, suggesting that Seoul's drainage network is relatively inefficient. When examining the correlation between the Gibbs coefficient and flood records from 2010 and 2011, areas with lower drainage efficiency showed more frequent flooding, though flooding also occurred at a higher frequency in efficient drainage networks (higher β). This indicates that even efficient downstream networks can contribute to flooding due to upstream-downstream connections. Analysis of areas with significant flooding in 2010 and 2011, such as the Gildong-Myeongil and Sindaebang areas, highlighted a pattern where efficient networks drain into less efficient ones. The study suggests that considering drainage network characteristics is essential for formulating upstream and downstream flood management strategies tailored to Seoul's unique network features.

Keywords
Drainage network
Gibbs’ Model
Urban flooding
Peak flows
Hydrograph

본 연구는 서울시 237개 배수 유역에 깁스모형을 적용해 배수망의 효율성을 분석하였다. 깁스모형 계수(β)를 통해 배수 효율을 평가한 결과, 서울의 배수관망이 상대적으로 비효율적인 특성을 가진 것으로 나타났다. 2010년과 2011년 침수 실적과의 연관성 분석에서는, 비효율적 배수망(β값이 낮은 지역)에서 침수 면적이 더 컸으나, 효율적인 배수망(β값이 높은 지역)에서도 오히려 높은 침수 비율를 보였다. 이는 빠른 배수가 가능한 지역이더라도 상하류 연결 관계 특성이 침수 가능성에 영향을 미칠 수 있음을 시사한다. 또한, 침수가 심했던 길동-명일, 삼성1-삼성2 등 4개 지역을 분석한 결과, 공통적으로 상류의 효율적인 배수 유역이 하류의 비효율적인 지역과 연결된 특징이 확인되었다. 따라서 본 연구는 상류와 하류의 배수망 특성을 고려한 보다 심도있는 홍수 관리 방안 수립의 필요성을 제안한다.

키워드
배수망
깁스모형
도시홍수
첨두유량
수문곡선
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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 : 57
  • No :12
  • Pages :1221-1230
  • Received Date : 2024-11-05
  • Revised Date : 2024-12-02
  • Accepted Date : 2024-12-03
  • DOI :https://doi.org/10.3741/JKWRA.2024.57.S-1.1221
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