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2025 Vol.58, Issue 9 Preview Page

Special Issue: Blue-Green-Grey 도시홍수

A study on discharge estimation methods considering water surface profile variations during lateral overflow

횡월류 발생 시 수면형 변화에 따른 유량 산정 방안 연구

Bogyeong Choia
,
Hosoo Leeb
,
Gwangmin Okc
,
Gwang Soo Kimd
,
Dongsu Kime
,
Young Do Kimf*
최 보경a
,
이 호수b
,
옥 광민c
,
김 광수d
,
김 동수e
,
김 영도f*
aMaster’s Course, Department of Civil & Engineering, MyongJi University, Youngin, Korea
bPh.D Course, Department of Civil & Engineering, MyongJi University, Youngin, Korea
cPh.D Course, Department of Civil & Engineering, MyongJi University, Youngin, Korea
dResearch Professor, Institute for Construction and Environment Engineering, Myongji University, Yongin, Korea
eProfessor, Department of Civil & Environmental Engineering, Dankook University, Korea
fProfessor, Department of Civil and Environmental Engineering, College of Smart Systems Engineering, MyongJi University, Yongin, Korea
a명지대학교 공과대학 토목환경공학과 석사과정
b명지대학교 공과대학 토목환경공학과 박사과정
c명지대학교 공과대학 토목환경공학과 박사과정
d명지대학교 건설환경연구소 연구교수
e단국대학교 공과대학 토목환경공학과 교수
f명지대학교 스마트시스템공과대학 스마트인프라공학부 건설환경공학전공 교수
*Corresponding Author
30 September 2025. pp. 815-823
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Abstract

Due to the increase in impervious surface area caused by urbanization and the rising frequency of heavy rainfall events, urban flooding damage has been occurring repeatedly, and lateral outflow hydraulic structures are being introduced as a countermeasure. However, the lack of accuracy in estimating the flow coefficient (C) under varying inflow and water level conditions presents challenges in the design and practical application of such systems. In particular, existing studies are heavily biased toward numerical model-based analysis, with insufficient experimental validation, thereby limiting their real-world applicability. In this study, experimentally analyzed the effects of water level measurement location (left bank, center, right bank) and water level conditions on discharge estimation and the flow coefficient (C) of lateral flow were experimentally analyzed. Experiments were conducted using three types of channels, and water levels were measured at each section. Based on the collected data, both the standard weir equation and the De Marchi equation were applied to calculate discharge and the flow coefficient (C), and the reliability of each equation was assessed using the coefficient of determination(R2). The results showed that discharge prediction accuracy varied depending on the water level measurement location, with the center or the difference between the left bank and center showing the highest determination (R2) values. In contrast, the right bank water level showed low explanatory power due to irregular flow characteristics. This study proposes an optimal discharge estimation method based on measurement location and flow characteristics in lateral weirs, which is expected to contribute to more accurate hydraulic modeling and the design of urban flood mitigation structures.

Keywords
Lateral outflow
Flow coefficient
Standard weir equation
De Marchi equation
Water surface fluctuation

도시화로 인한 불투수면적 증가와 집중호우의 빈도 상승으로 인해 도심 침수 피해가 반복되고 있으며, 이에 대한 대응 방안으로 횡월류 방식의 수공 구조물이 도입되고 있다. 하지만 유입 조건 및 수위 변화에 따른 유량계수(C) 산정의 정확성 부족으로 인해 설계 및 적용에 어려움이 존재한다. 특히, 기존 연구들은 수치모형 기반 분석에 편중되어 있으며, 실험적 검증이 부족하여 실무 적용에 한계가 있다. 이에 본 연구에서는 횡월류부의 수위 측정 위치(좌안, 중앙, 우안) 및 수위 조건의 변화가 유량계수 및 유량 산정에 미치는 영향을 실험적으로 분석하였다. 실험은 월류부 폭이 상이한 세 종류의 수로를 대상으로 수행되었으며, 각 구간의 수위를 Flowtracker와 레이더 수위계를 이용해 정밀 계측하였다. 수집된 데이터를 바탕으로 위어 유량 공식과 De Marchi 공식을 적용하여 유량 및 유량계수를 산정하였고, 결정계수(R2)를 통해 공식별 신뢰도를 비교하였다. 분석 결과, 수위 측정 위치에 따라 유량 예측 정확도가 달라졌으며, 특히 중앙 또는 좌안-중앙 수위 차를 활용한 조건이 가장 높은 결정계수를 보여주었다. 반면, 우안 수위는 불규칙한 흐름 특성으로 인해 낮은 설명력을 보였다. 본 연구는 횡월류 구조물의 수위 측정 위치와 흐름 특성에 따른 최적 유량 산정 방안을 제시하였으며, 이는 향후 도시 침수 방지 구조물 설계와 수리계산 모델의 정밀도 향상에 기여할 수 있을 것으로 기대된다.

키워드
횡월류
유량계수
위어 유량 공식
De Marchi 공식
수면형 변화
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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 :815-823
  • Received Date : 2025-08-12
  • Revised Date : 2025-09-03
  • Accepted Date : 2025-09-04
  • DOI :https://doi.org/10.3741/JKWRA.2025.58.9.815
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