Abstract: The natural river will be blocked after the completion of Shaping II hydropower station. In order to mitigate the impact on fish migration, the vertical-slot fishway is adopted in engineering design. The fishway plans, namely on left bank, guide wall and right bank, are drawn up and compared from the aspects of geological conditions, construction conditions, fish passing effect, engineering investment, etc. The results show that although the geological conditions of fishway on left bank are complex and the investment is the largest, the entrance section is connected with the riverbank, which is the main gathering and migration area of fish. The fish passing effect is good and the operation and maintenance are simple. So the plan of fishway on the left bank is recommended for this project.

Key words: power station blocking, fish migration, vertical-slot fishway, Shaping II hydropower station

摘要： 沙坪二级水电站建成后将阻隔原天然河道，为减少电站阻隔河道对鱼类洄游的影响，工程设计采用设置竖缝式鱼道的方法进行过鱼。笔者拟定了左岸方案、厂坝间导墙方案、右岸方案3个布置方案，从地质条件、施工条件、过鱼效果和工程投资等方面开展了比选研究。研究结果表明，左岸方案虽然地质条件复杂、投资最大，但方案进口段与河岸衔接，为鱼类的主要集聚和洄游区，过鱼效果较好，运行与维护简单，为本工程鱼道布置推荐方案。

关键词: 电站阻隔, 鱼类洄游, 竖缝式鱼道, 沙坪二级水电站