龙溪口航电枢纽工程鱼道进口布置论证与优化*

为确定龙溪口航电枢纽左岸仿生态鱼道的进鱼口布置方案，结合枢纽的运行工况和现有地形条件，发现较多工况下鱼道进口附近水流条件不满足鱼类上溯要求，需采取一定的工程优化措施。针对龙溪口枢纽的特点，选取典型工况对进鱼口及枢纽下游的水流条件进行研究。根据二维数值仿真模型的研究成果，拟采用拆除电站与泄水闸之间部分纵向围堰、电站尾水坎下游开挖疏浚以及左岸生境重构等方式，优化鱼道进口水流条件。对比分析不同进鱼口布置方案的优劣，推荐采用生境重构结合开挖疏浚的综合措施，优化龙溪口鱼道进口及下游流场，两者均满足龙溪口鱼道进口的流速要求。相关成果可为类似进口水流条件的数值模拟及进鱼口布置提供技术参考。

Fishway import arrangement demonstration and optimization of Longxikou Navigation-power Junction project

To determine the layout of the fish inlet of the imitation ecological fishway constructed on the left bank of the Longxikou Navigation-power Junction,this paper combines the operating conditions of the hub and the existing topographic conditions,and analyzes that the water flow conditions near the fishway inlet do not meet the fish upstream requirements under many operating conditions,and certain engineering optimization measures need to be taken.For the characteristics of the Longxikou hub,typical operating conditions are selected to study the water flow conditions at the fish inlet and downstream of the hub.Based on the research findings of a two-dimensional numerical simulation model,it is planned to optimize the water flow conditions at the fishway entrance through measures such as partially removing longitudinal weirs between the power station and spillway,excavating and dredging downstream of the tailwater slope of the power station,and reconstructing habitats on the left bank.The advantages and disadvantages of different fish inlet layout options are compared and analyzed,and it is recommended to optimize the inlet and downstream flow field of the fish passage at Longxikou estuary by using a combination of habitat reconstruction and dredging,both of which can meet the flow velocity requirements of the fish passage inlet at Longxikou estuary.The results can provide technical reference for numerical simulation and fishway inlet arrangement for other similar inlet flow conditions.