山溪性弯道河段船闸通航水流条件试验研究

Navigable flow conditions of ship lock in bend section of mountainous river

招贤枢纽位于山溪性河流转弯段,上游引航道处于凸岸主槽,下游引航道口门区处于下弯道凹岸,口门区及连接段存在较为严重的横向流速、回流、泡漩等不利水力现象,难以满足通航要求。依托180整体物理模型试验,研究上、下游航道不良水流条件形成的主要原因,通过调整枢纽运行方式以及疏浚局部下游河道等综合措施,有效降低口门区纵、横向流速和回流流速,使各项水力指标均满足规范要求,极大改善了船闸上下游引航道及其口门区通航水流条件,确保过闸船舶的安全。研究结果可供相关枢纽工程参考。

Zhaoxian junction is located in the bend section of mountainous rivers.The upstream approach channel is in the main channel of the convex bank,and the entrance area of the downstream approach channel is on the concave bank.The entrance area and the connecting section have serious adverse hydraulic phenomena such as lateral flow velocity,backflow,and water surface boil and flow vortex,which are difficult to satisfy the requirements of navigation.This study employs the overall physical model test on a scale of 180 to study the main reasons for the formation of adverse flow conditions in the upstream and downstream channels.We effectively reduce the velocity of cross-flow,lateral flow,and backflow by taking comprehensive measures such as adjusting the operation mode of the junction and dredging local downstream channels and make all hydraulic indicators up to specifications.As a result,flow conditions in both the upstream and downstream approach channels and the entrance area are greatly improved,which can ensure the safety of ships passing through the lock.The research results can provide a reference for related junction projects.