A study on inflow control methods for deep stormwater tunnel

Dongyeop Lee; Taekmun Jeong; Jongpyo Park

doi:10.3741/JKWRA.2025.58.9.793

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2025 Vol.58, Issue 9 Preview Page Next Page

Special Issue: Blue-Green-Grey 도시홍수

A study on inflow control methods for deep stormwater tunnel 대심도 빗물저류배수터널의 유입 유량 제어 방법 연구

30 September 2025. pp. 793-804

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Abstract

In response to the increasing frequency of extreme rainfall events due to climate change, the Seoul Metropolitan Government is planning to construct additional deep stormwater drainage tunnels to address rainfall volumes that exceed the capacity of existing stormwater systems. This study examines effective inflow control strategies for a planned deep drainage tunnel in the Sadangcheon basin, aiming to mitigate urban flooding during the monsoon season. The XP-SWMM hydrological and hydraulic modeling software was utilized to simulate flood scenarios and assess the impact of inflow control on reducing inundation. The application of inflow control measures resulted in a reduction of inundation area by approximately 34.2% and a delay of approximately 20 minutes in reaching the designed storage capacity. These findings suggest that implementing inflow control during tunnel operation can enhance the tunnel's capacity to manage consecutive rainfall events and significantly improve urban flood prevention.

Keywords

Deep stormwater tunnel

Inflow control

Storage efficiency

Management of prolonged rainfall

Urban flooding

기후변화로 인한 집중호우 발생 빈도 상승으로 서울시는 기존 우수관로의 통수능을 상회하는 양의 빗물 저류를 위하여 대심도 빗물저류배수터널의 추가 설치를 계획 중이다. 본 연구에서는 서울시에 있는 사당천 유역 내에 설치 예정된 대심도 빗물저류배수터널의 홍수기 유입 유량을 효과적으로 제어하기 위한 방법을 연구하였다. 연구에는 XP-SWMM 모형이 활용되었으며 유입 유량 제어에 의한 침수 저감 효과를 검토하였다. 유입 유량 제어를 적용한 결과, 침수 면적이 약 34.2% 감소하였으며, 설계 저류용량 포화 시간이 약 20분 지연되는 등 유의미한 개선 효과를 확인하였다. 대심도 운영 시 유입 유량 제어를 시행하여 대심도 빗물저류배수터널의 연속 강우 대응 능력을 향상시키고, 도시홍수를 보다 효과적으로 예방할 수 있을 것으로 기대된다.

키워드

대심도 빗물저류배수터널

유입 유량 제어

저류 효율성

연속강우 제어

도시홍수

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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 :9
Pages :793-804
Received Date : 2025-06-30
Revised Date : 2025-08-05
Accepted Date : 2025-08-07
DOI :https://doi.org/10.3741/JKWRA.2025.58.9.793

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

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