Comparing with the origin shape,the dredged channel can maintain narrower and deeper in a long time,which indicates that the river channel dredging is beneficial to sediment deliver and flood control.

• 挖槽河段在很长一段时间内保持比原平衡河道较窄深的断面形态，说明挖槽疏浚对河道输沙和洪水灾害防治是有利的。