长江下游东流水道6m水深工程治理思路及方案设计

东流水道历来是长江下游重点浅险水道之一,水道内汊道众多,滩槽变化剧烈,主支汊转换较为频繁。经过前期不断治理,航道条件逐步改善,但仍难达到6 m水深的规划标准。为给东流水道6 m水深工程提供技术支撑,通过分析东流水道河床演变特点及碍航特性,提出治理思路和方案;建立物理模型,对6 m水深工程方案效果进行分析。研究表明,整治方案实施后,东流水道可实现6.0 m×110 m×1050 m设计航道尺度,在不利水文年份须进行少量维护性疏浚,同时随着工程效果的发挥及河道的自然演变,西港航道条件将进一步改善,为后续进一步提升航道尺度奠定基础。

Regulation idea and scheme design of Dongliu waterway 6 m water depth project in the lower Yangtze River

Being one of the key shallow dangerous watercourses in the lower reaches of the Yangtze River,the Dongliu waterway is characterized by multiple channels in the watercourse,dramatic changes of the beach trough,and frequent change of the main and branch channels.After continuous regulations,the conditions of the waterway improved gradually,but it is still difficult to reach the planned standard of 6 m water depth.To provide a technical support for the 6 m deep water project of the Dongliu waterway,we put forward the regulation ideas and schemes by analyzing the characteristics of the river bed evolution and obstruction characteristics of the Dongliu waterway.A physical model was established to analyze the effects of the 6-metre depth engineering scheme.The study shows that after the implementation of the remediation plan,the east waterway can realize the designed scale of 6.0 m×110 m×1 050 m,and a small amount of maintenance dredging is required in unfavorable hydrological years.At the same time,under the engineering effect and with the natural evolution of the river channel,the conditions of the West Harbor waterway will be further improved,which will further enhance the waterway scale.