长江澄通河段通州沙西水道整治工程对分流比影响研究

为增加长江澄通河段沿江深水岸线资源,拟进行通州沙西水道整治工程,主要包括边滩圈围工程、洲头潜堤工程、西水道疏浚工程。利用一二维耦合潮流数学模型,模拟计算不同整治方案实施前后的汊道分流比,分析研究工程对通州沙河段的影响。研究结果表明:边滩圈围和潜堤工程、西水道航道疏浚工程、上游径流条件等都将影响通州沙西水道的分流比;仅仅实施边滩圈围和潜堤工程,将减少西水道分流比,而疏浚工程将使西水道分流比有所增加;整治工程实施后,通州沙河段分流比的改变程度主要取决于西水道的疏浚深度,因此,为维持该河段河势稳定应慎重选择西水道的疏浚尺度。

Research on influence of regulation works on diversion ratio of Tongzhousha west channel in Chengtong reach,Yangtze River

The regulation works for Tongzhousha west channel,including the point-bar reclamation,submerged breakwaters and dredging works,were conducted for the sake of enriching the coastline resources from deep water.The different diversion ratios of the branch channels were simulated and calculated before and after the regulation plan with one-dimensional and two-dimensional coupling wave-current model to analyze the influence of regulation works on Tongzhousha reach.Results indicate that the point-bar reclamation,submerged breakwaters,dredging constructions and upstream runoff conditions,etc.have an effect on the diversion ratio.Specifically,the diversion ratio of Tongzhousha west channel will be reduced by point-bar reclamation and submerged breakwaters,while it will be increased by the dredging works.The variation degree of the diversion ratio after the regulation works mainly depends on the dredging depth of west channel.Therefore,the dredging scale should be considered cautiously for the maintenance of the stability of the river regime.