通州沙滩面串沟封堵高程数学模型研究*

通州沙与狼山沙之间存在的串沟与通州沙东水道下段浅区存在一定的关联关系，串沟的存在不仅不利于滩体的守护，也会对主流起到一定分散或冲散作用。因此在长江南京以下12.5 m深水航道建设工程一期工程通州沙段航道整治中，在考虑增强浅区水流动力的同时，必须考虑限制串沟的过流来巩固护滩效果。采用二维潮流数学模型对现状滩面串沟分流能力进行分析，通过多方案比选，综合考虑护滩效果、限流导流作用以及投资效率，提出可兼顾固滩稳槽与导流增深双重作用的滩面串沟整治思路，本研究为其它类似滩面串沟封堵及分流河段的整治工程方案探讨提供了参考。

Study on the tidalflat currents and navigational channel regulation of the Tongzhou shoal

The existence of the ditch between the Tongzhou shoal and the Langshan shoal should have some influence on the formation of the shallow area of the east Tongzhou shoal watercourse. The ditch not only makes against to the protection of the nearby shoals, but also plays a significant role of dispersing or breaking up the mainstream. So, as to the navigational channel regulation project of the Tongzhou shoal, both restricting the ditch, protection the shoal and improving the hydrodynamics of the shallow area should be taken account in at the same time. Based on a well calibrated 2D hydrodynamic model, the currents distribution on the shoals, ditch, tidalflat and the watercourses are analyzed, and a suitable position for restricting the ditch currents and regulating the channel is proposed. The proposed layout is certified being of dual role of both stabilizing river regime of this reach and improving the scour capability of the shallow area through scenario study.