Abstract：
The construction of fish passage facilities can mitigate the negative effects of dams and other water engineering construction on river connectivity and have a significant positive effect on the conservation of local fish diversity. To attract target fishes into fish passage facilities effectively, the optimal flow velocity range to attract fish must be determined. Three local endemic species of the Mishi Reservoir were considered as the protection targets. However, their swimming abilities remain unclear. Therefore, the induced swimming speed (Uind), critical swimming speed (Ucrit) and burst swimming speed (Uburst) of three fish species were tested. Based on these results, we identified the optimal flow velocity to attract fish, which falls within the range of 0.15-0.51 m/s. A validated three-dimensional hydrodynamic model was used to simulate different schemes. By comparing the flow field simulation results of different schemes, we obtained the optimal measure to restore the flow field, namely, a multiple engineering measure combining increased the fish attraction flow in the fish collection pond and the construction of a spur dike. This study offers a solution for the specific case and enhances the database of swimming characteristics of endemic fish in the upstream reaches of the Yangtze River. It also provides a valuable reference for designing fish-attracting flows and potential measures for restoring flow fields in similar future projects.
摘要：
鱼类通道设施的建设可以减轻大坝等水工程建设对河流连通性的负面影响，对保护当地鱼类多样性具有显著的积极作用。为了有效吸引目标鱼类进入鱼类通道设施，必须确定吸引鱼类的最佳流速范围。米石水库的三个当地特有物种被认为是保护目标。然而,他们的游泳能力尚不清楚。因此,诱导游泳速度(Uind)，测试了三种鱼类的临界游泳速度（Ucrit）和爆发游泳速度（Uburst）。基于这些结果,我们确定了吸引鱼的最佳流速，在0.15-0.51m/s的范围内。使用经过验证的三维水动力模型来模拟不同的方案。通过对比不同方案的流场模拟结果,我们得到了恢复流场的最佳措施，即,一项综合工程措施，增加了集鱼池中的鱼吸引流量，并建造了支堤。这项研究为特定情况提供了解决方案，并增强了长江上游特有鱼类的游泳特征数据库。这也为今后类似工程中设计吸引鱼流和恢复流场的潜在措施提供了有价值的参考。
