顺直分汊河段洲尾船闸的口门区三维流态数值模拟

Numerical simulation of three-dimensional flow patterns at entrance area of ship lock at bar tail in straight braided reaches

顺直分汊河段汇流区水流情况较为复杂,将船闸口门区布置在汇流口河中水流掺混区,存在水流流态紊乱等碍航问题,不利于船闸的通航安全。为充分认识洲尾船闸口门区水流流态特性,采用Mike 3FM模块三维水流数值模拟技术,针对沅水下游已建桃源枢纽船闸口门区的三维水流流态进行研究,得到了分汊河道洲尾船闸口门区中洪水期下泄水流平面流态分布特性,交汇水流的主流带、掺混区及动力轴线的规律等,为分汊河段河中布置新建船闸以及旧有船闸的设计和升级改造提供了相关理论基础。

The water flow situation in the confluence area of straight braided reaches is complicated.If the entrance area of a ship lock is arranged in the mixing area of the confluence river,navigation problems such as flow pattern disorder occur,which is not conducive to the navigation safety of the ship lock.Therefore,the three-dimensional(3D)numerical flow simulation technology of the Mike 3FM module is used to obtain a sufficient understanding of the characteristics of the flow pattern at the entrance area of the ship lock at the bar tail.Specifically,we study the 3D flow pattern at the entrance area of the ship lock in the Taoyuan junction built in the lower reaches of the Yuanshui River and mainly obtain the distribution characteristics of the planar flow pattern of the discharge flow at the entrance area of the ship lock at the bar tail in the braided reach in the middle flood period,as well as the laws of the main flow zone,mixing zone,and dynamic axis of the confluence.The research can provide a theoretical basis for relevant research on the design of a new ship lock and the upgrading and reconstruction design of an old ship lock in braided reaches.