Abstract
Submerged hydraulic jump has been characterized by water surface profile and velocity at a center line of channel. This paper presents characteristics of submerged jumps below a sluice gate on the basis of experimental works. Submerged hydraulic jumps below a sluice gate in a horizontal rectangular channel were investigated experimentally under a wide range of gate opening heights, discharges, and water depths at upstream and downstream of a sluice gate. The flow condition below a sluice gate can be classified into deflecting flow and non-deflecting flow. In the case of deflecting flow, an unstable three dimensional flow is formed. The flow condition can be characterized by time series change of velocity. Further, the relationship of upstream and downstream depths of a sluice gate could be predicted by using Bernoulli’s equation and momentum equation. The boundary between deflecting and non-deflecting flows could be expressed from prediction curve.
