水口电站坝下工程下引航道水流条件治理分析

Management and analysis of flow conditions of under approach channel for project blow the dam of Shuikou power station

水口坝下水位治理工程是无闸低坝枢纽,不能控制洪水、调节泄流位置,无论上游来流量高低,对下游引航道通航条件的影响均较大,本文针对其水流运动特点和泥沙淤积问题,利用水力学原理与泥沙运动理论,创建了隔离水流、切断泥沙流路的技术方法,通过增设隔流墙、拦沙底坎和优化靠船墩布置等工程措施,较好地改变引航道内的水流条件,有效地阻止了泥沙淤积。模型试验结果显示引航道内的水深、流速等通航指标均能满足规范要求,文章提出的方法可供类似工程参考。

Minjiang hydropower station dam water treatment project is the low dam without gate. So it can not control the flood and regulate location of discharge. Whether the level of the upstream flow is large or not, it will bring great impact to the navigation conditions of downstream approach channel . Based on the features of water movement and siltation problems, utilize principles of hydraulics and sediment movement theory, create some technical methods such as isolating water and cutting off path of sediment flow. By subjoining cut-off wall and sediment sill as well as optimizing the layout of dolphins, the flow conditions within the approach channel are changed better and also effectively prevent silting. Model test results show that the navigable index such as depth and flow rate in approach channel all can meet the regulatory requirements. The methods which presented in this paper can provide a reference for similar projects.