Abstract
Background: Hydraulic jump is considered the most appropriate option for designers to dissipate energy through stilling basins. Methods: Tests on a screen that produced a submerged hydraulic jump were conducted to dissipate the energy of water passing beneath a vertical gate. Various positions of a screen in a sudden expanding stilling basin were investigated. In comparison to the no-screen case, the effect of a screen downstream of the gate on the water surface profile was also investigated. Results: The best screen position was 0.25 of the abutment lengths with a 0.285 relative screen area, which resulted in the most energy loss with the lowest tail water depth and submerged hydraulic jump length. Theoretical equations based on the energy and momentum principles were derived. Conclusion: An acceptable agreement was obtained between the derived theoretical relative depth of the hydraulic jump and the measured values.
Highlights
Hydraulic jump is regarded as a proficiency implement for energy dissipation downstream gates
The relative energy loss increased as the Froude number increased for all submergence ratios
The relative energy loss decreased as the submergence ratio increased at a specific Froude number
Summary
Hydraulic jump is regarded as a proficiency implement for energy dissipation downstream gates. The accurateness of gates may vary according to the conveyed flow condition. Some countermeasures such as sills, baffles and screens are supplied to the stilling basins downstream the gates to increase the basin efficiency and stabilize the hydraulic jump. Rajaratnam (1965) verified that the submerged hydraulic jump jet decreased the mixing as the submergence ratio increased [1]. This leads to less dissipation of the energy compared to the free hydraulic jumps and the disappearance of the high-velocity jet. Hydraulic jump is considered the most appropriate option for designers to dissipate energy through stilling basins
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