Study on Hydraulic Characteristics of Stilling Pool Downstream of Diversion Tunnel of Qianping Reservoir
The hydraulic characteristics of diversion tunnel,such as discharge capacity,velocity and water surface line are studied by 1:90 normal physical model test in this paper.The influence of the size of the downstream outlet stilling pool on the efficiency was studied.The results show that the discharge capacity of diversion tunnel of Qianping Reservoir meets the requirements under the two characteristic working conditions.Reducing the length of stilling pool has no effect on the discharge capacity of diversion tunnel.At the same time,the state of the hydraulic jump changes from vibrating hydraulic jump to stable hydraulic jump.The efficiency effect has been significantly improved.The downstream bend and tail channel flow pattern are improved.The project investment is also reduced.The research results provide a reliable theoretical basis for engineering design and safe operation.
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