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2018 Vol.51, Issue 5 Preview Page
An experimental study on the discharge characteristics of underflow type floating vertical lift gate at free-flow condition

부력식 연직수문의 자유흐름 상태에서 하단방류 특성에 관한 실험적 연구

Il Yeong Hana*
,
Heung Sik Choib
,
Ji Haeng Leea
,
Sung Min Raa
한 일영a*
,
최 흥식b
,
이 지행a
,
나 성민a
aSamhwa Environment and Construction Co., Ltd.
bDepartment of Civil Engineering, Sangji University
a삼화건설환경(주)
b상지대학교 건설시스템공학과
*교신저자. *Corresponding Author. 
31 May 2018. pp. 405-415
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Abstract

Hydraulic variables such as discharge coefficient, gate opening, and upstream water depth are required to calculate the discharge of vertical lift gate. It is very important for a precise gate design, because it may affect the rest, to predict the behavior of gate opening during operation. In this study, an equation by which gate opening could be predicted with any upstream water depths was derived from the relation between the calculated value from buoyancy theory and measured one from experiment for a floating gate model. Downpull force was the reason for the differences between the calculated and the measured and it was verified using pressure coefficient. Also, the relation of discharge coefficient with gate opening ratios was derived. The derived relations were used for flood routing and it was realized that downpull force effect should be fully taken into account during gate design.

Keywords
Discharge coefficient
Gate opening
Floating gate
Downpull force
Pressure coefficient

연직수문의 방류량 계산에 필요한 수리학적 변수는 유량계수, 수문개방고, 상류수심이다. 자동수문의 수문개방고는 나머지 변수에도 영향을 미치기 때문에, 운영 중 수문개방고의 거동을 예측하는 것은 정밀한 수문설계를 위해 매우 중요하다. 본 연구에서는 부력식 연직수문 모형을 대상으로 부력이론으로 계산한 수문개방고와 실험에서 방류 중에 측정한 값과의 관계로 부터, 임의의 상류수심에서 수문개방고를 예측할 수 있는 무차원 관계식을 도출하였다. 측정값이 계산 값과 차이가 나는 것은 동수압 하중에 의한 영향임을 압력계수를 이용하여 검증하였다. 유량계수는 수문개방율과의 무차원 관계식을 도출하였다. 도출된 관계식들을 홍수추적에 적용한 결과, 수문설계 시에는 동수압 하중으로 인한 수문개방 억제 효과를 충분히 고려하여야 하는 것으로 판단되었다.

키워드
유량계수
수문개방고
부력식 연직수문
동수압 하중
압력계수
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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 : 51
  • No :5
  • Pages :405-415
  • Received Date : 2018-01-08
  • Revised Date : 2018-02-02
  • Accepted Date : 2018-02-02
  • DOI :https://doi.org/10.3741/JKWRA.2018.51.5.405
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