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2019 Vol.52, Issue 2 Preview Page

Research Article

Measurements of turbulent flows downstream of a spur dike at different Froude numbers

Froude 수 변화에 따른 수제 하류 난류 흐름 측정

Jiyong Leea
,
Yeongkyu Kimb
,
Jun-Ho Chac
,
Seokkoo Kangd*
이 지용a
,
김 영규b
,
차 준호c
,
강 석구d*
aResearcher, Department of Civil and Environmental Engineering, Hanyang University, Seoul, Korea
bPh.D. student, Department of Civil and Environmental Engineering, Hanyang University, Seoul, Korea
cResearcher, Han River Flood Control Office, Ministry of Environment, Seoul, Korea
dAssistant Professor, Department of Civil and Environmental Engineering, Hanyang University, Seoul, Korea
a한양대학교 공과대학 건설환경공학과 연구원
b한양대학교 공과대학 건설환경공학과 박사과정
c한강홍수통제소 수자원정보센터 연구사
d한양대학교 공과대학 건설환경공학과 조교수
* Corresponding Author
28 February 2019. pp. 115-123
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Abstract

The effects of the Froude numbers on turbulent flow patterns downstream of a non-submerged spur dike were investigated in a laboratory flume. Three-dimensional velocities and water depths were measured using Acoustic Doppler Velocimetry and distance sensors under three Froude number conditions (Frd=0.31, 0.38, and 0.46). The results show that there are marginal differences in the velocity fields downstream of a spur dike due to the change of the Froude number. However, an increase of the Froude number was found to reduce cross-sectional area in the flow and to increase the strength of the jet-like flow. The jet-like flow was observed to displace the location of the maximum turbulence kinetic energy within a cross section toward the inner bank in the transverse direction.

Keywords
Spur dike
Open channel
Three-dimensional flow
Recirculation flow
ADV

잠기지 않은 수제 하류의 3차원 흐름구조에 Froude 수 변화가 미치는 영향을 알아보기 위한 수리모형 실험을 수행하였다. 3가지 Froude 수 조건에 대하여 초음파 유속계와 수위계를 이용하여 3차원 유속과 수심을 측정하였다. Froude 수는 시간평균유속 및 난류 특성의 전반적인 분포에는 크게 영향을 미치지 않는 것으로 나타났다. 그러나 Froude 수가 증가할수록 수제 위치의 흐름단면이 감소하고 제트 흐름 강도의 증가가 관찰되었다. 이 제트 흐름은 단면 내 최대 난류에너지 발생의 위치를 안쪽 제방으로 이동시키는 것으로 나타났다.

키워드
수제
개수로
3차원 흐름
재순환흐름
초음파 유속계
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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 : 52
  • No :2
  • Pages :115-123
  • Received Date : 2018-10-12
  • Revised Date : 2018-11-26
  • Accepted Date : 2018-12-19
  • DOI :https://doi.org/10.3741/JKWRA.2019.52.2.115
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