New Approach for Estimating of Energy Dissipation over Stepped Spillways

Hydraulics of stepped spillway is a very complicated phenomenon, as it consists ofa two phase flowpassing through a set of designed steps. the steps increase the rate ofenergy dissipation taking place on thespillway face. turbulence. flow aeration and energy dissipation are the main tasks in the design of suchstructures. this study consists of the experimental investigation to determine the energy dissipation overstepped spillways. experiments conducted at water research institute on two physical models of the siyanbisheh stepped spillways in iran. to develop a more generalized expression, the results of previousinvestigations were also considered in our study. therefore, a wide range of variables were taken into accountto estimate the energy dissipation along the non-uniform flow regime. assuming the energy dissipation alongthe uniform flow regime to be equal to the vertical displacement ofthe jet. the total energy lost was calculated.a comparison of the results with those of measurements showed a regression of 0.92 for the total energydissipation. which is one of the features of the present method for estimating of the energy dissipation,compared with the previous investigation.