hydraulic design of in-ground stilling basin under submerged jump conditions for flood mitigation dams

抄録

Forced submerged jumps within a non-prismatic stilling basin, named in-ground stilling basin, were experimentally investigated. An in-ground stilling basin (ISB) is a newly popular concept for stilling basin downstream of flood mitigation dams (FMDs). In FMDs usually one bottom outlet is located in the centerline and the width of the stilling basin is much wider than the width of the bottom outlet, which leads to a small expansion ratio, k, for the outflow. This study experimentally investigates the flow patterns and velocity reduction, within ISB downstream of FMDs, under different hydraulic and geometric conditions. Finally, an innovative design guide-line is proposed considering downstream flow requirement.