长洲水利枢纽四线船闸引航道通航水流条件数值模拟

Numerical simulation and analysis of navigation flow conditions in approach channel during Changzhou four-paralleling-lane locks filling and emptying

长洲水利枢纽3、4线船闸拟并列建于现有1、2线船闸右侧,并共用引航道。采用平面二维水流数学模型,对四线船闸充泄水时的上、下游引航道和口门区通航水流条件进行了计算分析。结果表明:引航道内纵向流速、口门区横流以及船闸闸前的惯性水头超标是影响船闸安全运行的主要因素;上游3、4线船闸充水,对1、2线船闸的影响不大,但下游3、4线船闸泄水,对1、2线船闸的影响较大;1、2线船闸充泄水对3、4线船闸影响不大;多数正常运行工况下,3、4线船闸不能同时充泄水,在上游正常蓄水位20.6 m、下游设计最低通航水位3.32 m条件下,3、4线船闸需采用相互输水方式运行。

The third and fourth lane locks of Changzhou hydro-junction would be constructed paralleling at the right bank of the first and second lane locks and sharing the approach channel. By 2-dimensional flow numerical model, the navigation flow conditions in approach channel and entrance area during Changzhou fourparalleling-lane locks filling and emptying were analyzed. The results show that longitudinal current velocity in approach channel, transverse current velocity at entrance area and inertia head at lock head exceeding standard are the mainly influence elements for locks operating safety. There are little harmful effects to the first and second lane locks during the third and fourth lane locks filling and some harmful effects during emptying. There are little harmful effects to the third and fourth lane locks during the first and second lane locks filling and emptying. The third and fourth lane locks could not operate simultaneously at many normal conditions, and it must adopt the pattern which two lane locks filling and emptying each other for the third and fourth lane locks operating safety when the upstream water level is normal pool level for 20.6 m and downstream water level is designed lowest navigable stage for 3.32 m.