新开沙—裤子港沙河段近期河床演变及对深水航道工程的影响

Recent riverbed evolution in Xinkaisha to Kuzigangsha branch and influence on deepwater channel project

长江南京以下12. 5 m深水航道一期工程的实施稳定了通州沙东水道下段至狼山沙东水道12. 5 m深水航道右边界,但深水航道左侧边界(新开沙—裤子港沙河段)因未采取整治措施而仍处于自然演变状态。经对该区域自一期工程实施以来的地形变化进行分析,结果表明:新开沙右侧沙尾向窄长型发展,沙尾淤积下延;裤子港沙滩面冲刷,沙尾淤长南压并进入航道内;新开沙—裤子港沙之间串沟持续发展,并于2015年12月10 m等深线贯通。这些变化都将对深水航道水深维护产生不利影响,建议尽快开展深水航道后续完善工程的相关研究。

With the implementation of the Yangtze River 12.5 m deepwater channel first stage regulation project,the 12.5 m deepwater channel right boundary of Tongzhousha east waterway to Langshansha east waterway has become stable.But the left boundary of the deepwater channel, the Xinkaisha to Kuzigangsha branch is still in the natural evolution without regulation measures.We analyze the topographic changes since the project constructed.The results show that Xinkaishasand shoal is becoming narrow and long with the sand silted at the tail.The tail of Kuzigangsha sand shoal is moving southward and invaded into the deepwater channel.A new ditch between Xinkaisha and Kuzigangsha is in developing,and the 10 m fathom line linked up in December 2015.These changes will take the negative effects to the maintenance of deepwater channel,and it is suggested that the related research on the follow-up improvement project of deepwater channel should be carried out as soon as possible.