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2026 Vol.59, Issue 4 Preview Page
OpenFOAM-based design and deposition induction performance analysis of semi-circular sediment control structures in deep drainage tunnels

OpenFOAM 기반 대심도 배수터널 내 반원형 유사 제어 구조물의 설계 및 침적 유도 성능 분석

Yoon Seo Leea
,
Seung Oh Leeb*
이 윤서a
,
이 승오b*
aMaster’s Course, Department of Civil Engineering, Hongik University, Seoul, Korea
bProfessor, Department of Civil & Environmental Engineering, Hongik University, Seoul, Korea
a홍익대학교 토목공학과 석사과정
b홍익대학교 건설환경공학과 교수
*Corresponding Author
30 April 2026. pp. 333-347
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Abstract

Deep drainage tunnels have large diameters, great depths, and long alignments, which make in-situ experiments and high-resolution measurements difficult; numerical modeling is therefore essential for assessing sediment transport and deposition. This study uses the three-phase OpenFOAM solver SedInterFoam to simulate sediment transport under free-surface flow. The model is first validated against open-channel experiments by comparing vertical profiles of velocity and suspended-sediment concentration, and then applied to conditions representative of a Korean deep drainage tunnel. A simplified tunnel reach is modeled, with a continuous semi-circular storage section embedded along the invert, having width B = 0.60 m and depth H = 0.30 m. Under identical inflow and sediment supply, two configurations are compared: a reference tunnel with a flat invert and a tunnel with the storage section. Simulations examine temporal changes in bed-deposit thickness, sediment capture in the storage section, and residual deposition and long-distance transport in the main tunnel. Results show that the semi-circular section creates a low-velocity recirculation zone that concentrates sediment trapping and reduces both mean bed thickness and downstream transport. The findings provide quantitative guidance for the application of sediment-control structures in deep drainage tunnels.

Keywords
Deep drainage tunnel
Sediment transport
Sediment trap
OpenFOAM

대심도 배수터널은 대구경·장거리·대심도로 인해 현장 실험과 고해상도 계측이 어렵고, 터널 내 유사 거동 평가는 수치 모의에 크게 의존한다. 본 연구에서는 OpenFOAM 기반 3상 솔버 SedInterFoam을 이용해 자유수면 하 유사 이송과 침적을 모의하였다. 먼저 개수로 수리 실험을 재현한 단면에서 수직 속도와 유사 농도 분포를 비교하여 모형을 검증한 뒤, 이를 국내 대심도 배수터널 제원에 맞춘 단순화 도메인에 적용하였다. 유지관리 차량 통과 폭을 고려해 폭 B = 0.60 m, 깊이 H = 0.30 m인 반원형 저류부 단면을 터널 바닥에 연속 배치하고, 동일한 유입 유량·유사 조건에서 저류부 미설치 기본 단면과의 차이를 비교하였다. 두 경우에 대해 시간에 따른 저면 침전두께, 저류부 내 유사 포착량, 본선 터널 바닥 잔류 침전 및 하류 이송량을 분석하였다. 그 결과 반원형 저류부는 저류부 내부에 저속·재순환 영역을 형성하여 유사를 국부적으로 포착하고 본선 바닥 평균 침전두께와 하류 유사 이송을 유의하게 감소시키는 것으로 나타났다. 본 결과는 대심도 배수터널의 유사 제어 구조물 적용 여부와 제원 결정에 대한 정량적 근거를 제공한다.

키워드
대심도 배수터널
유사 이송
유사 제어 구조물
OpenFOAM
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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 :4
  • Pages :333-347
  • Received Date : 2025-12-31
  • Revised Date : 2026-02-10
  • Accepted Date : 2026-02-11
  • DOI :https://doi.org/10.3741/JKWRA.2026.59.4.333
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