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虎渡溪枢纽位于岷江干流的青神县段,是岷江干流航电梯级开发规划中的第六级,枢纽坝址处原为分汊河道,左汊为主槽,右汊(冲天壕)为副槽,枢纽建成后将右汊河道封闭,造成下游沙河村岛出现防洪问题。通过建立几何比尺为λ_L=150、λ_h=100的小变率河工模型,对天然情况、无分洪道方案和设置分洪道方案进行了水位流速观测,计算了不同情况下左右两汊河道的分流比,并对分洪道方案进行优化,使枢纽建成前后的两汊道的分流比达到一致,解决了坝下游沙河村岛的防洪问题。
Hubuoxi Junction is located in Qingshen County section of the Minjiang River main stream, which is the sixth level in the planning of avionics development of the Minjiang River. The dam site was originally divided into sub-river courses with left bank as main tank and right bank as Vice slot, after the completion of the hub will be closed to the right bank of the river, resulting in the downstream Shahe island flood control problems. Through the establishment of small-rate river model with geometrical scale of λ_L = 150 and λ_h = 100, the water flow velocity observation was carried out for natural conditions, non-flood diversion scheme and flood diversion scheme, and the diversion of two rivers was calculated Ratio, and optimize the scheme of the flood diversion so that the diversion ratio of the two roads before and after the completion of the hub reaches the same, so as to solve the flood control problem of Shahe Island in the downstream of the dam.