in this paper we investigate the mechanism of internal erosion caused in the right abutment of the shahghasem dam’s spillway. shahghasem dam is an earthen dam located in yasouj, in southwest of iran. a significant hole and pipe have been observed in the corner of the right abutment from upstream view. the foundation is marlstone, which has low cohesion and susceptible for internal erosion and p...

ABSTRACT During voluntary or involuntary spills, the total dissolved gas (TDG) may increase with potential of causing bubble disease (GBD) in affected fish. Bubbles entrained during spill events Colider are transported by plunging jets to deep, high pressure, regions tailrace where dissolution is enhanced increasing TDG concentrations. The most common alternative minimize supersaturation downst...

Stilling basins are designed to reduce the high kinetic energy of supercritical flow in a downstream spillway. The USBR II stilling basin is distinguished by chute blocks fixed at upstream end and dented sill end, allowing for effective dissipation excess energy. This research investigates effect chute-block geometry on hydraulic performance basin. Six modified chute-blocks with identical dimen...