Experimental Study On Energy Dissipation And Structure Optimization Based On Yueliangwan First-level Hydropower Station Of Shule River

The yueliangwan first-level hydropower station is the fifth hydropower stationsin Shule River cascade development, the dam height is31m and the design capacity is49.7m3/s. The general layout, building design, building water drainage project werestudyed based on the Yueliangwan first-level hydropower station, and the rationalityof the general layout and the shape design were verified by the model experiments.The capacity and effect of energy dissipation of the spillway surface orifice and floodand sediment releasing tunnel were verified, the economical and reasonable designproposals were put for existing problems through shape adjusting.(1) The layout and configuration design of the design plan is reasonable from theflow pattern.(2) The capacity of the the original design scheme is larger, so the width of thespillway surface orifice by9m change to7.8m in the prioritization scheme.(3) Although there is negative pressure in the weir surface in check water level,which will not cause cavitation damage for the weir surface. In the top of the floodand sediment releasing tunnel, there is negative pressure in the in20years and30years flood, the maxmium negative pressure is-1.5×9.8kPa, which is bad for thetunnel stable, in order to improve the pressure distribution of the tunnel, the slopegradient section was used in the outlet of the flood and sediment releasing tunnel.(4) The scouring riverbed overburden indicates that the downstream erosion isnot obvious of spillway stilling pool, the design of stilling pool wall deeps teeth5m, itis reasonable that the river of the stilling pool downstream is no longer do protection.There is erosion in the riverway behind the flip bucket of the flood and sedimentreleasing tunnel under different conditions. The original bucket tooth wall deepfoundation3m deepened to6m;1.5m3tetrahedral protection were set up along theslope is about60m long and20m wide.