界牌鱼道进口水力特性数值模拟与优化

以界牌枢纽鱼道工程为例,结合鱼类生态水力特性和平面二维水动力数学模型对界牌枢纽下游河道进行数值模拟,分析电站机组、泄水闸控泄等多重复杂调度方式下的鱼道进口水力特性,并进行方案优化。结果表明,在原设计方案下,新、老电站组合工况下的鱼道进口流速过大,超过鱼类顺利上溯的水力限值;当鱼道进口段附近的电站出水渠进行适当扩宽后,鱼道进口附近水流流速均满足设计要求,在此基础上,进一步将原设计尾水出口左侧的高程开挖使得鱼道进口上移,以此实现鱼道进口良好的上溯条件。

Numerical simulation and optimization of hydraulic characteristics of Jiepai fishway

Taking the fishway project of Jiepai hub as an example,we simulate the downstream channel of Jiepai hub by using ecological hydraulic characteristics and two-dimensional hydrodynamic model,analyze the hydraulic characteristics of fishway entrance under multi-complex scheduling of power station and sluice gate control,and optimize the scheme.The results show that the flow index of fishway entrance under new and old power station operation is rather large and beyond the scope of smooth upward trace of fish for the previous design scheme.While the flow velocity near fishway entrance is apt to satisfy the design requirements if outlet channel of power station near fishway entrance is properly widened.It is suggested to further excavate the left side of the original design tail water outlet so as to make fishway entrance move upward,and create good conditions of fishway entrance.