长江下游东北水道河床演变与6.0 m航道整治思路

针对长江下游东北水道6. 0 m航道存在的碍航问题,依据河道地形和水文资料,分析了东北水道河床演变特点及航道条件,并对该河段航道整治的对策进行了探讨。结果表明:东北水道总体航道条件较好,仅在局部年份在河心出现浅包,导致航道水深和宽度不足;为改善东北水道航道条件,航道整治工程可考虑在已建东北水道航道整治工程基础上,加高下三号洲左缘低滩,稳定过渡段主流流路,并适当缩窄过渡段河槽,集中水流冲刷浅区,也可考虑仅在局部出浅年份采用疏浚措施。

Evolution of riverbed in Dongbei waterway of the Yangtze River and 6.0 m waterway regulation idea

In view of the navigation obstruction problem in the 6.0 m channel of Dongbei waterway of the lower reaches of the Yangtze River,based on the river topography and hydrological data,the riverbed evolution characteristics and waterway conditions of Dongbei waterway are analyzed,and the countermeasures of waterway regulation in this section are also discussed.The results show that the overall waterway conditions of Dongbei waterway are good,only shallow packets appear in the river center in local years,resulting in insufficient water depth and width of the channel.In order to improve the conditions of Dongbei waterway,the waterway regulation project may consider to raise the low beach on the left side of the third continent on the basis of the construction of the northeast waterway regulation project,stabilize the mainstream flow path of the transition section,narrow the channel of the transition section appropriately,concentrate the water flow on the shallow area,or consider to adopt the dredging measures only in the locally shallow years.