S形弯曲河段低水头闸坝枢纽口门区通航水流条件研究

Navigation condition at entrance of approach channel of low-head hydro-junction in S-shaped curved river

以老口枢纽为例,分析S形弯曲河段上低水头闸坝枢纽引航道上、下游口门区水流特点,通过整体物理模型试验及自航船模验证试验,提出改善水流条件的具体措施。研究结果表明:通过修改上下引航道隔墙形式、局部地形开挖、岸坡回填、增设潜丁坝,以及调整凸岸岸线等措施,调整了引航道中心线位置并缩小引航道中心线与河道主流流向交角,减弱及消除了上下游引航道及口门区存在的回流、挑流及隔墙堤头的绕流等不利流态,有效改善了老口枢纽的通航水流条件,为S形弯曲河段低水头闸坝枢纽设计提供参考。

Taking Laokou junction for example, we study the flow patterns in the upper ＆ downstream entrance area of approach channel on S-shaped curved river by physical model test.The overall model test of Laokou junction and the self-propelled ship model test with both scales 1：100 are adopted to choose some comprehensive measures to improve the flow patterns near the upper approach channel and downstream approach channel.The study results show that, some modification facilities such as partition walls with hollow base, diversion pier, slope excavation, back slope, submerged dike and adjusting bank line, are all used in the modification scheme and get great effect, which provide a basis for the optimized arrangement and navigation condition design.