湘江近尾洲二线船闸下游引航道口门区通航水流条件改善措施

湘江近尾洲枢纽二线船闸为升级改造工程,位置和轴线没有选择余地,下游引航道口门区的通航水流条件只能依靠优化开闸方式或修建导流墩来改善。采用1∶100定床正态河工物理模型试验,在充分认识常规开闸泄流方式下游引航道口门区水流条件的基础上,通过多种开闸泄流方式的组合试验以及导流墩布置数量、间距、角度等优化试验,提出常规开闸+边孔补流的泄流方式,或布设单墩长度20 m、走向与航线平行、间距20 m的3个导流墩,均可将通航流量提高到2 a一遇洪水标准。

Measures of improving navigable flow conditions in entrance area of downstream approach channel of Jinweizhou second-line ship lock in the Xiangjiang River

The second-line ship lock of Jinweizhou Junction in Xiangjiang is an upgrade and reconstruction project. There is no choice of location and axis. The navigational flow conditions in the entrance area of the downstream approach channel can only be improved by optimizing the opening method or constructing a diversion pier. Using 1∶100 fixed-bed normal river physics model test, on the basis of fully understanding the water flow conditions of the downstream approach channel entrance area of the conventional gate discharge method,through a combination of multiple-gate discharge methods and diversion pier layout optimization experiments such as number,spacing,angle,etc.,we propose the conventional way of opening gate + side hole supplementary discharge,or the arrangement of three diversion piers with a single pier length of 20 m,a direction parallel to the route,and a spacing of 20 m. Both can be opened to the traffic flow increased to a flood in 2 years.