瓦村枢纽下游引航道通航水流条件试验研究

摘要

The overall fixed-bed model is established to study navigation condition of downstream approach channel and entrance area of Wacun hydro-junction to get good flow condition for navigation.According to the model test result:affected by water diffusion from power station tail and free jet from right bank slope of tail water outlet, the flow condition in downstream approach channel and entrance area with poorer flow regime and excessive amounts of longitudinal velocity and lateral velocity do not meet the requirements for ship safety navigation.This paper discusses the influence of engineering measures on water flow conditions,such as extending the length of the navigation wall, expanding the slope of the right bank, and adding the other piers.The recommended scheme determined by the comparison and optimization of model schemes solved the problem of larger cross flow in the entrance area well.The navigation flow conditions of downstream approach channel and entrance area meet the requirements of safe navigation for the ship.%为保证船闸口门区有利于通航的良好水流条件,采用整体定床物理模型对瓦村枢纽船闸下引航道及口门区通航水流条件进行研究.试验结果表明:受电站下泄尾水扩散及尾水渠出口右岸边坡挑流的影响,下引航道口门区水流流态较差,纵横向流速明显超标,不满足船舶安全航行要求.探讨了延长导航墙长度、扩挖尾水出口右岸边坡、增设隔流墩等措施对水流条件的影响,经模型方案比选及优化,确定了下引航道布置推荐方案,较好地解决了口门区横流较大的问题,使下引航道及口门区的水流条件满足船舶安全通航要求.