The Yangtze river mouth is a wide and multiple-stage bifurcated course, the shoals distribute densely in river channel.Under the co-action of dynamic factors, such as runoff, tide and wave etc.

• 摘要长江口河道多级分汊，江面宽阔，江中沙洲密布，在径流、潮流、波浪等多种动力因素的作用下，河势演变复杂。