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2025 Vol.58, Issue 5 Preview Page

Research Article

Analysis of urban flooding trend and risk based on rainfall patterns

강우 패턴에 따른 도심지 침수 경향 및 위험성 분석

Dogyu Leea
,
Inhwan Parkb*
이 도규a
,
박 인환b*
aGraduate Student, Department of Civil Engineering, Seoul National University of Science and Technology, Seoul, Korea
bAssistant Professor, Department of Civil Engineering, Seoul National University of Science and Technology, Seoul, Korea
a서울과학기술대학교 건설시스템공학과 석사과정
b서울과학기술대학교 건설시스템공학과 조교수
*Corresponding Author
31 May 2025. pp. 385-398
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Abstract

This study aims to analyze the impact of rainfall pattern changes on urban flooding and drainage system performance and propose appropriate urban flood analysis methods based on the duration and pattern of design rainfall. Inundation simulations were conducted for the northern urban area of Gwangju Stream using PCSWMM. The Huff quartile method was applied to generate design rainfall scenarios with durations of 1~24 hours and return periods of 5~500 years for each quartile. The flood analysis results indicated that for short-duration rainfall events of 3 hours or less, total flooded areas increased as peak rainfall was delayed. For longer-duration events of 6 hours or more, the first-quartile rainfall produced the largest flooded areas. Additionally, the analysis of drainage system performance showed that Number of Surcharged Pipes (NSP) and Length of Surcharged Pipes (LSP) exhibited temporal changes depending on the timing of peak rainfall but had a low correlation with the total flooded area. The hazard risk analysis revealed that, during short-duration rainfall, flood risk areas tended to increase as peak rainfall was delayed, with areas of Low and Significant risk levels showing increased. This study highlights the influence of rainfall patterns on urban flood analysis and proposes appropriate durations and patterns for design rainfall based on the analysis objectives.

Keywords
Rainfall pattern
Urban flooding
Flood risk
PCSWMM

본 연구는 강우 패턴의 변화가 도심지 침수 및 배수 시스템 성능에 미치는 영향을 분석하고, 설계 강우의 지속기간과 패턴 변화에 따른 적합한 도심지 침수해석 방법을 제시하는 것을 목적으로 한다. 광주천 북부 도심지 영역을 대상으로 1차원 및 2차원 SWMM 모형을 결합하여 침수 모형을 구축하였으며, Huff 4분위 방법을 적용하여 분위별 지속기간 1~24시간, 재현 기간 5~500년의 설계 강우를 생성하였다. 침수해석 결과, 지속기간 3시간 이하의 단기 강우에서는 첨두 강우의 발생 지연에 따라 총 침수 면적이 증가하였고, 6시간 이상의 장기 강우에서는 1분위 강우에서 가장 큰 침수 면적이 발생하였다. 또한, 배수 시스템의 성능 분석결과, Number of Surcharged Pipes (NSP)와 Length of Surcharged Pipes (LSP)는 첨두 강우의 발생 시점에 따라 시간적 변화를 보였으나, 총 침수 면적과는 낮은 상관관계를 보였다. Hazard Rating (HR)을 기반으로 위험 면적을 분석한 결과, 단기 강우에서는 첨두 강우의 발생 지연에 따라 침수 위험 면적이 증가하는 경향이 나타났으며, Low와 Significant 단계의 위험 면적은 단기 강우에서 높게 나타났다. 본 연구에서는 도심지 침수해석 시 강우 패턴의 영향을 확인하였고, 분석 목적에 따라 적합한 설계 강우의 지속기간 및 패턴을 제안하였다.

키워드
강우 패턴
도심지 침수
침수 위험성
PCSWMM
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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 : 58
  • No :5
  • Pages :385-398
  • Received Date : 2025-01-07
  • Revised Date : 2025-03-11
  • Accepted Date : 2025-03-21
  • DOI :https://doi.org/10.3741/JKWRA.2025.58.5.385
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