One of the most important conflicts that shaft spillways have to deal with is vortex formation. This phenomenon leads to some unfavorable effects such as vibration in the body of structures, air entrainment and reduced overflow capacity of the spillway. Among all solutions for disrupted vortex formation, an innovative one called circular piano-key spillway, based upon piano key weir principles ...

In the stepped spillway, steps, by providing an artificial roughening bed, dissipate flow of energy more than other types spillways, so construction costs for stilling basin are reduced. However, what is important in this type spillway increasing effectiveness steps rate dissipation. The present study deals with experimental and numerical simulations regarding influence geometric appendance ele...

According to the study on shape of plunge pool in horizontal swirl spillway tunnel, design scheme a with better energy dissipation effect is proposed. Based hydraulic physical model test, which includes atmospheric pressure and decompression tests, combined different pool, measurement results fluctuating pressure. Main frequency sidewall are analysed. The show that inlet section connected by gr...

Cavitation is among the most complicated and common damages of spillway structures. This phenomenon is controlled by different parameters including the pressure, flow velocity, spillway surface material, operation time, and air flow content. The cavitation index is calculated along the spillway and compared with its critical value using the measured values of the flow’s hydraulic parameters. Th...

Abstract In a stepped spillway, the spillway face is provided with series of steps from near crest to toe. This type attractive for water resource management because it dissipates energy that within flow. When dissipated by steps, reduces reduction otherwise must occur at toe spillway. present study, nine physical models slopes 15, 25, 45° and number varying 5 50 have been constructed. The spil...