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چکیده
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Here, the energy dissipation of the flow is investigated with the vertical drop, gradually expanding, and vertical screens. The experiments were carried out, with two vertical drop heights, and wall expanding ratios of 0.5 to 1. Also, the porosity ratio of the screens was 40% and 50%. The results showed that the use of screens increases energy dissipation, and decreases the pool depth and the downstream depth. The application of expanding walls, screens and the effect of simultaneous use of screens and expanding walls increases the efficiency of energy dissipation by 25, 44, and 48%, respectively. The porosity ratio of the screen is not much efficient in energy dissipation, but it reduces the pool depth and increases the downstream depth. In the same hydraulic conditions, energy dissipation is increased and the depth of the pool decreases by increasing the height of the drops due to the increased jet severity over the drop striking the downstream bed
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