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2026 Vol.59, Issue 10 Preview Page
A full-scale experimental study on flow characteristics and discharge reduction effect of a flood detention basin using multi-ADCP measurements

수문 개방에 따른 홍수조절지 유량 조절효과 실규모 실험 분석

Seogyeong Leea
,
Dongsu Kimb*
,
Hosoo Leec
,
Young Do Kimd
,
Dohyeon Kime
,
Jongmin Kimf
이 서경a
,
김 동수b*
,
이 호수c
,
김 영도d
,
김 도현e
,
김 종민f
aPh.D. Candidate, Department of Civil & Environmental Engineering, Dankook University, Yongin, Korea
bProfessor, Department of Civil Engineering, Dankook University, Yongin, Korea
cPh.D Candidate, Department of Civil & Environmental Engineering, Myongji University, Yongin, Korea
dProfessor, Department of Civil and Environmental Engineering, College of Smart Systems Engineering, Myongji University, Yongin, Korea
eIntegrated M.S.–Ph.D, Program, Department of Civil & Environmental Engineering, Dankook University, Yongin, Korea
fResearch Specialist, Research Policy Division, Research Strategic Planning Department, Korea Institute of Civil Engineering and Building Technology, Goyang, Korea
a단국대학교 인프라건설공학과 박사과정
b단국대학교 인프라건설공학과 교수
c명지대학교 토목환경공학과 박사과정
d명지대학교 스마트시스템공과대학 스마트인프라공학부 건설환경공학전공 교수
e단국대학교 인프라건설공학과 석박사통합과정
f한국건설기술연구원 연구전략기획본부 연구정책부 전임연구원
*Corresponding Author
31 October 2026. pp. 1243-1257
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Abstract

Increasing extreme rainfall due to climate change and the expansion of impervious areas caused by urbanization have significantly increased flood risks in riverine and urban watersheds. Flood detention basins have therefore been widely implemented as a structural measure to mitigate flood damage. To evaluate the hydraulic performance of detention basins, it is essential to quantitatively analyze overflow discharge generated during gate operation and the resulting reduction in downstream discharge. In this study, overflow discharge induced by gate opening was reproduced using a pilot-scale flood detention basin constructed at the Andong River Experiment Center. Overflow discharge variation and discharge reduction characteristics were analyzed using multiple hydraulic measurement instruments. An RS5 ADCP was installed at the overflow section to directly measure overflow discharge, while side-looking ADCPs were deployed at upstream and downstream sections to simultaneously monitor inflow and outflow discharges in the main channel. In addition, radar water level sensors were used to observe water level variations at the overflow section, and a microwave surface velocity meter was applied to analyze surface velocity distribution. The experimental results showed a clear difference between upstream and downstream discharges after gate opening, indicating that a portion of the main channel flow entered the detention basin through the overflow section. Based on representative quasi-steady flow conditions after gate opening, the discharge reduction rate was estimated to range from approximately 39.7% to 67.6%. This indicates that controlled gate operation effectively reduces downstream discharge by diverting part of the main channel flow into the detention basin. This study provides a quantitative evaluation of overflow discharge variation and discharge reduction using multi-instrument flow measurements in a pilot-scale flood detention basin. The results can serve as fundamental data for the design and operational assessment of flood detention basins.

Keywords
Flood detention basin
Overflow flow
Discharge reduction
ADCP discharge measurement
Multi-ADCP measurement

기후변화에 따른 극한 강우의 증가와 도시화로 인한 불투수면적의 확대는 하천 및 도시 유역에서의 홍수 위험을 증가시키고 있다. 이러한 홍수 피해를 저감하기 위한 구조적 대책으로 홍수조절지가 널리 활용되고 있으며, 홍수조절지의 수리학적 성능을 평가하기 위해서는 수문 개방 시 발생하는 월류 유량의 변화와 하류로 전달되는 유량 저감 효과를 정량적으로 분석하는 것이 중요하다. 본 연구에서는 안동 하천실험센터에 구축된 pilot 규모 홍수조절지 실험시설을 대상으로 수문 개방에 따른 월류 흐름을 재현하고, 다중 계측 장비를 활용하여 월류 유량 변화와 유량 저감 효과를 분석하였다. 월류부에는 RS5 ADCP를 설치하여 월류 유량을 직접 계측하였으며, 본류의 상·하류 구간에는 Side-looking ADCP를 설치하여 유입 및 유출 유량을 동시에 관측하였다. 또한 레이더 수위계를 이용하여 월류부의 수위 변화를 관측하고, 전자파 표면 유속계를 활용하여 표면 유속 분포 특성을 분석하였다. 실험 결과, 수문 개방 이후 상류와 하류 유량 사이에 뚜렷한 차이가 발생하는 것으로 나타났으며, 이는 본류 유량의 일부가 월류부를 통해 저류지로 유입된 결과로 해석된다. 수문 개방 이후 준정상 대표 구간을 기준으로 분석한 결과, 유량 저감률은 약 39.7–67.6% 수준으로 나타났다. 이는 조절지 운영을 통해 하류로 전달되는 유량을 효과적으로 감소시킬 수 있음을 의미한다. 본 연구는 pilot 규모 홍수조절지에서 다중 계측 기반 유량 관측을 통해 수문 개방 시 월류 유량 변화와 유량 저감 효과를 정량적으로 검증하였다는 점에서 의의가 있으며, 향후 홍수조절지의 설계 및 운영 평가를 위한 기초 자료로 활용될 수 있을 것으로 기대된다.

키워드
홍수조절지
월류 흐름
유량 저감
ADCP 유량 계측
다중 ADCP 계측
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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 :1243-1257
  • Received Date : 2026-05-07
  • Revised Date : 2026-08-06
  • Accepted Date : 2026-08-14
  • DOI :https://doi.org/10.3741/JKWRA.2026.59.10.1243
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