Abstract
Three groups of cubic roughness elements non-protruding to the flow were fixed with a specific configuration at the downstream of a stream lined lib sluice gate. The aim was to test the performance of the hydraulic jump under using such elements as appurtenances of stilling basin. The experimental works has been conducting to test; four different intensities, I=8%, 10%, 12% and 16%; three width to height ratios, We/he=0.75, 1.5 and 2; and three length to height ratios, Le/he=0.75, 2 and 4, of cubic elements made from waterproof stiff rubber. The test was performed under the incoming Froude number; F1 ranged between 2.7 to 9. After analysing the experimental data one from the second group configuration gives a higher reduction of sequent depth ratio, y2/y1 as compared with the depth ratio of the un-forced hydraulic jump which calculated by Belanger equation, this decreases arrived 20%. Also greater relative energy has been dissipated, and the gain in dissipation (%GED) ranged between 10.8-22.3%.
Highlights
Hydraulic jumps are divided into two types according to the bed characteristics
The tail water depth in a roughened bed was 20% lower compared to that formed on a smooth bed. [5], carried out an experimental study on non-protruding prismatic roughness and he has studied the effect of the varying upstream flow parameters, i.e. the initial Froude number, Fr1, and initial depth, y1, with the boundary roughness parameters, as the length ratio, pitch ratio, and roughness arrangement, on the characteristics of the hydraulic jump. [6], measured the characteristics of hydraulic jump
Four different intensities, I=8%, 10%, 12% and 16%; three width to height ratios, width of the element to its height (We/he)=0.75, 1.5 and 2; and three length to height ratios, length of the element to its height (Le/he)=0.75, 2 and 4, of cubic elements made from waterproof stiff rubber have been adopted to show the effects of these arrangements on the characteristics of the hydraulic jump
Summary
Hydraulic jumps are divided into two types according to the bed characteristics. The first is a classical hydraulic jump occur over a smooth bed and has been studied extensively by different researchers such as [4,19,13,14,22]. These two advantages (i.e., more dissipation of surplus kinetic energy and reducing the sequent depth ratio) can be achieved by roughing the bed of stilling basin by specific elements.
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