Sensitivity analysis of 1D-2D urban flood modeling to the inclusion of stormwater inlets

Geumchae Shin; Junghwan Lee

doi:10.3741/JKWRA.2026.59.10.1171

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2026 Vol.59, Issue 10 Preview Page Next Page

Sensitivity analysis of 1D-2D urban flood modeling to the inclusion of stormwater inlets 빗물받이 적용에 따른 1-2D 도시침수 모형 민감도 분석

31 October 2026. pp. 1171-1181

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Abstract

Urban flood simulations depend on accurate representation of surface-sewer interactions, and stormwater inlets play a critical role in controlling inflow to the sewer network. This study quantified the effects of stormwater inlet representation on sewer system performance and urban flood characteristics by comparing two scenarios: one without stormwater inlets (Case 1) and one with stormwater inlets (Case 2). A coupled 1D-2D model based on InfoWorks ICM was developed and applied to two rainfall events: an extreme rainfall event in 2022 and a moderate rainfall event in 2025. The results show that under extreme rainfall conditions, rapid saturation of the sewer network and pump capacity resulted in only minor differences in flooded area and pump discharge between the two scenarios. In contrast, under conditions with available sewer capacity, the inclusion of stormwater inlets reduced the flooded area by approximately 22% and produced noticeable differences in flood timing and spatial distribution. These findings indicate that the representation of stormwater inlets significantly influences both the magnitude and spatial characteristics of urban flooding.

Keywords

Stormwater inlets

Urban flooding

Sewer network

Drainage

도시침수 시뮬레이션은 지표 유출수가 하수관망으로 유입되는 구조에 따라 달라지며, 빗물받이의 반영 여부는 이러한 유입 구조 차이를 결정하는 핵심 요소이다. 본 연구는 실제 침수 피해가 발생한 도시유역을 대상으로 빗물받이를 반영하지 않은 경우(Case 1)와 반영한 경우(Case 2)를 비교하여 지표-관망 유입 구조가 하수관망의 배수 특성과 침수 분포에 미치는 영향을 분석하였다. InfoWorks ICM 기반의 1D-2D 연계 모형을 구축하고, 극한 강우 사상(2022년)과 설계 강우 범위 내 강우 사상(2025년)을 대상으로 시나리오별 모의 결과를 비교하였다. 분석 결과 극한 강우 조건(2022년)에서는 관망 및 펌프 용량이 단시간 내 포화 상태에 도달하여 빗물받이 반영 여부에 따른 침수 면적 및 펌프 토출량 차이는 제한적으로 나타났다. 반면, 관망에 여유용량이 존재하는 강우 조건(2025년)에서는 빗물받이를 반영한 경우 침수 면적이 약 22% 감소하였으며, 침수 발생 시점과 공간 분포에서도 유의미한 차이가 확인되었다. 이는 빗물받이 반영 여부가 침수 규모뿐만 아니라 침수 발생 양상에도 직접적인 영향을 미친다는 것을 보여준다. 따라서 도시침수 모형의 적용성과 해석 신뢰성을 확보하기 위해서는 빗물받이를 반영한 지표-관망 연계 구조를 보다 상세하게 반영할 필요가 있으며, 향후 도시침수 해석의 정확도 향상에 기여할 것으로 기대된다.

키워드

빗물받이

도시침수

하수관망

배수 성능

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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 : 59
No :10
Pages :1171-1181
Received Date : 2026-01-30
Revised Date : 2026-07-01
Accepted Date : 2026-07-13
DOI :https://doi.org/10.3741/JKWRA.2026.59.10.1171

Journal of Korea Water Resources Association ISSN:2799-8746(Print) 2799-8754(Online) 한국수자원학회 논문집

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