分散式布置枢纽引航道口门区水流条件优化措施

Flow condition improvement measures at entrance area of approach channel under by-pass layout form

分散式布置的通航水利枢纽引航道口门区水流流态主要受到与其相衔接的河道形态影响。以广西邕宁水利枢纽工程可行性研究阶段布置方案为例,对分散式布置枢纽上下游引航道口门区流态与主流的衔接关系和通航水流条件优化措施进行研究。通过在船闸口门区增设导流堤和合理开挖右岸滩地的方式解决邕宁枢纽上游引航道口门区回流较大的问题;通过合理调整下游左岸岸边开挖线,压缩下游回流区,解决因下游引航道口门区主流流向与船闸中心线夹角较大而造成的回流严重问题。使得上下游引航道口门区均具有良好的通航条件。

The flow pattern at the entrance area of the approach channel of navigation junction under the bypass layout form is mainly influenced by the connecting river＇s morphology. Taking Guangxi Yongning hydraulic junction project layout scheme at feasibility study stage as a study case, we prob into the relationship between the flow pattern at the entrance area of the upper ＆ lower approach channel of the junction under the by-pass layout form and the main stream, we also study the improvement measures for the navigation flow condition. Constructing the diversion dike at the lock＇s entrance area and excavating the right-bank shoal, we solve the problem of great backflow at the upper approach channel＇s entrance area of Yongning junction; Adjusting the lower-stream left-bank excavation line, we solve the problem of serious backflow due to the large angle between the main flow direction at the lower approach channel＇s entrance area and lock＇s central line, so that we can ensure favorable navigation condition at the entrance areas of both the upper and lower approach channels.