Discrete Analysis of Local Scour Morphology of Bridge Piers Affected by Sediment Storage Dam

In order to solve the prediction and protection problems of local pier scour with a downstream sediment storage dam on non-uniform sand riverbeds in mountainous areas, Xi’an Chanhe Bridge China was taken as research object. Through comprehensive physical model experiments, influence layout surrounding water flow morphology around bridge piers studied. The relationship between boundary conditions pit studied using discrete analysis model. results showed that inflow rate Q most significant factor affecting scour, generally developed rapidly within 0.5–1.0 h then gradually reached dynamic equilibrium. maximum depth located 0.25B front relative width B, impact range behind [5B,10B]. recommended has distance L [8B,11B] crest elevation Z higher than original riverbed at pier, which is [0.4B,0.5B]. An improved calculation formula for hs proposed verified through experimental measurements provide reference design dam.