在平原河流中,分汉河段及复杂浅滩往往成为航运的严重障碍,也多数是难以整治的浅滩类型。因为分汊河段经常处于发生、发展和衰亡的过程中,且由于水文及边界条件的变化而出现反复,主流摆动,航道不稳定。复杂浅滩则因上滩和下滩相距极近,多数情况下,中间深槽小而浅,两滩互相影 In the plain rivers, the sub-Han River section and the complex shallows have often become serious obstacles to shipping, and most of them are shoal types that are difficult to rehabilitate. Because sub-river sections are often in the process of occurrence, development and decline, and due to changes in hydrological and boundary conditions appear repeatedly, the mainstream swing, waterway instability. Complex shoals due to the beach and the next beach is very close, in most cases, the middle of the small and shallow deep groove, the two beaches interact with each other