Analysis of Dominant Factors for Density Current Sediment Discharge Efficiency of Xiaolangdi Reservoir

This paper has analyzed impact on shaping density current forward of the Reservoir and sediment discharge of Sanmenxia Reservoir water storage capacity before flood season and discharge method, and pointed out that Sanmenxia Reservoir shall store water as much as possible before flood season and gradually enlarge water outflow before discharge in the process of regulation; on the basis of correlation between docking water level and delta vertex elevation, this paper has pointed out that Xiaolangdi Reservoir occurs retrogressive erosion and longitudinal erosion which can greatly increase silt concentration at plunging point of density current when docking water level is close to or is lower than the sedimentation delta vertex elevation of Xiaolangdi Reservoir and is combined with large flow discharging process of Sanmenxia Reservoir.