长洲五线船闸下引航道通航水流条件试验研究

Experimental research on navigation flow conditions in downstream approach channel of Changzhou fifth-line ship lock

近年随着长洲枢纽货运量持续高速增长,现有4线船闸已不能满足日益增长的货运量过闸要求,需修建五线船闸来满足货运量发展需求。采用整体水工模型试验的方法,研究长洲五线船闸下引航道口门区的通航水流条件,并提出下引航道通航条件的改善措施。结果表明,受长洲五线船闸下引航道口门区河床地形不衔接、外江下泄水流斜冲和下游弯道凸嘴顶托等问题,口门区存在较大横流和回流等不良流态,通航条件较差。通过采取调整口门区下游衔接段河底高程、削除下游弯道凸嘴、疏浚扩挖外江河道左岸边滩等措施,可有效改善五线船闸下引航道口门区通航水流条件,调顺船舶进出闸航线,使之满足船舶安全航行要求。

With the continuous rapid growth of freight volume of Changzhou Hub in recent years,the four existing locks can no longer meet the increasing requirements of freight volume crossing,and the fifth-line lock need to be built to meet the needs of freight volume development.Based on the method of integral hydraulic model test,this paper studies the navigation flow condition in the entrance area of downstream approach channel of Changzhou fifth-line ship lock,and it puts forward the measures to improve the navigation conditions of the downstream approach channel.The results show that,affected by the unconnected riverbed topography in the entrance area of the downstream approach channel of the fifth-line ship lock,the oblique flushing of the discharge flow from Waijiang River and the jacking of the convex nozzle in the downstream bend,there are bad flow patterns such as large cross flow and backflow in the entrance area,and the navigable flow conditions are poor.By adoption of measures such as adjusting the river bottom elevation of the downstream connection section of the entrance area,removing the downstream curve convex,dredging and expanding the beach on the left bank of the Waijiang River,which can effectively improve the navigation flow conditions in the entrance area of the five-line ship lock,and adjust the routes of ships entering and leaving the lock,so as to meet the safety navigation requirements of ships.