大渡河安谷水电站过鱼设施改造效果研究

Study on Modification Effects of Fish Passage Facilities in Angu Hydropower Station in Dadu River

大渡河安谷水电站建成后运行水位变更,竖缝式鱼道和仿自然通道下凿闸底板,降低高程,以保证水流条件。为了解改造后鱼道水力条件和过鱼效果,测量过鱼设施内的水位和流速,使用网捕法调查生态河道和过鱼设施内的鱼类特征,分析改造前后过鱼设施运行状况和水生生态调查结果的变化,得到以下主要结论:改造后鱼道和通道的运行保证率大幅提高,水动力条件接近设计效果;改造后调查区域内鱼类种类更丰富,部分洄游鱼类的种群数量明显增加;安谷水电站生态河道放水闸竖缝式鱼道和仿自然通道的渔获物物种组成有明显差异,鱼道和通道适用于不同鱼类,有效互补。

Due to the changed operating water level after the building of Angu Hydropower Station in Dadu River,the gate floors of the vertical slot fishway and nature-like passage are chiseled to lower the elevation and ensure water flow conditions.In order to understand the hydraulic condition of the modified fishway and the effect of fish passing,the water level and flow velocity in the fish passage facility are measured.The features of fishes in ecological river channels and fish passage facilities are investigated through net capturing.In addition,the operation status of fish passage facilities and the changes in aquatic ecological investigation results before and after modification are analyzed.The following main conclusions are drawn.After modification,the operation guarantee rate of fishway and passage is greatly improved,and the hydrodynamic conditions are close to the design effect;there are more fish species within the survey area after modification,and the species number of some migratory fishes has increased remarkably;there are obvious differences in fish species between vertical slot fishway and nature-like passage of ecological river sluice in Angu Hydropower Station,and the two channels are suitable for different fish species,showing a complementary effect.