چكيده لاتين :
Hydraulics of stepped spillway is a very complicated phenomenon, as it consists ofa two phase flow
passing through a set of designed steps. The steps increase the rate ofenergy dissipation taking place on the
spillway face. Turbulence. flow aeration and energy dissipation are the main tasks in the design of such
structures. This study consists of the experimental investigation to determine the energy dissipation over
stepped spillways. Experiments conducted at Water Research Institute on two physical models of the Siyan
Bisheh stepped spillways in Iran. To develop a more generalized expression, the results of previous
investigations were also considered in our study. Therefore, a wide range of variables were taken into account
to estimate the energy dissipation along the non-uniform flow regime. Assuming the energy dissipation along
the 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 energy
dissipation. which is one of the features of the present method for estimating of the energy dissipation,
compared with the previous investigation.
