长江南京以下12.5m深水航道一期工程通州沙河段齿坝方案研究

Groin engineering of channel regulation project in Tongzhousha shoal reach

为了成功实现12.5 m深水航道由太仓上延至南通的预定目标,拟对通州沙河段洲滩关键部位进行必要的工程整治,整治措施主要包括修建潜堤及齿坝。为了明确通州沙河段整治工程各齿坝的功能定位,采用SWEM2D模型建立了覆盖通州沙河段的平面二维潮流数学模型,通过研究工程实施前后周边流场变化情况来确定整治工程各齿坝工程的功能,为最终方案设计提供科学依据。研究结果表明,通州沙河段整治工程上游5根齿坝主要以固滩稳槽为主,下游3根齿坝则以导流增深为主,结合潜堤工程的修建,工程对于通州沙航道困难段整治主要以减小狼山沙窜沟分流、增加航道困难段落潮动力为主。

To achieve the projected goal of extending a 12.5 m deep water channel upward from Taicang to Nantong, a regulation project on the key parts of Tongzhousha shoal is designed to improve its ability of navigation. The regulation project includes the construction of submerged dike and groin. To investigate the function of the groin and provide the scientific basis for its final design, a 2D hydrodynamic numerical model of Tongzhousha shoal reach based on SWEM2D model is established to study the variation of tidal current after completion of the regulation project. The results show that the first five groins at upper stream are mainly to consolidate the shoal as well as stabilize the channel, and the other three groins are mainly to divert the water and deepen the water depth. The regulation project including the submerged dike and groins is mainly to reduce the water distribution at Langshan shoal channel and increase the flow dynamics at the shallow section.