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 ...

Abstract: Control of reservoir sedimentation in order to ensure their sustainable use has drawn attention among water engineers and water resource managers. Several methods have been proposed, but most of the developed methodologies are incapable of modelling bed evolutions, while at the same time, compute sediment flushing efficiency. In this study a two-dimensional bed evolution model is prop...

Abstract Siphon-shaft spillways can discharge large amounts of water down to the crest level in a narrow reservoir thanks siphonic pressures. However, cavitational pressures siphon-shaft limit operating head these spillways. An enlargement at shaft mouth reduce vacuum and velocities within flows, thereby removing risk cavitation occurring. In this study, four different enlarging profiles with v...

Vortex drop shaft (VDS) spillways are eco-friendly hydraulic structures used for safely releasing flood. However, due to the complexity of three-dimensional rotational flow and lack suitable measuring devices, current experimental work cannot interpret behavior reliably inside VDS spillway, consequently CFD study on a spillway with an elliptical tangential inlet was conducted further discern in...

Abstract Siphon-shaft spillways are constituted by covering above a shaft spillway with hood that creates siphonic pressure. This study focused on the aeration flow through aerator holes placed to prevent cavitational damage in high-head siphon-shaft spillways. Three-dimensional computational fluid dynamics (CFD) technique using finite-volume method solve Reynolds-averaged Navier–Stokes (RANS) ...