龙溪口航电枢纽仿自然鱼道设计

Simulated natural fishway design of Longxikou Navigation-power Junction

为确定岷江航电龙溪口枢纽仿自然鱼道布置的合理性和设计基本参数,对工程河段开展鱼类资源调查和游泳能力测试。通过三维数值模拟计算验证鱼道池室尺寸与池室内流速关系,通过物理模型试验对鱼道内部水流流态、控制断面流速等水力学参数进行研究。提出仿自然鱼道设计方案:1)鱼道进口布置在发电厂房尾水渠末端,采用发电尾水诱鱼并在进口布设补水设施;2)鱼道采用藕节形+梯形断面结构,内设横隔,鱼道和横隔均采用天然卵石堆砌;3)下游河道左岸布设缓流平台,消除鱼类上溯流速屏障。试验结果表明,龙溪口仿自然鱼道池室内部流态多样性,流速满足过鱼要求。

To determine the rationality and basic design parameters of the simulated natural fishway layout at Longxikou Navigation-power Junction in Minjiang River,we carry out fish resource investigation and swimming ability tests for the project river.The relationship between the size of the fishway chamber and the flow velocity inside the chamber is verified by three-dimensional numerical simulation calculations,and the hydraulic parameters such as the flow pattern and control section velocity in the fishway are studied by physical model tests.We propose the design scheme of a simulated natural fishway:1)The fishway inlet is arranged at the tailrace channel end of the power plant to lure fish by tailwater from power generation and water replenishment facilities are installed at the inlet.2)The fishway adopts a lotus root type+trapezoidal cross-section structure with transverse diaphragms inside and both the fishway and diaphragms are stacked with natural pebbles.3)A slow flow platform is set up on the left bank of the downstream river to eliminate the upstream flow velocity barrier of fish.The test results show that the diversity of flow patterns and the flow velocity inside the simulated natural fishway pool at Longxikou meets the fish passage requirements.