Analysis of ovcrbank flood flowing through wide channels on lower Yellow River

Based on an analysis of field data, it is expounded that the overbank flood is of strong capacity in sediment deposition on the flood plain and scouring in the main channel under the condition of continuous shrinkage of channels on the lower Yellow River. It is also pointed out that overbank flood-induced deposition on flood plain is mainly caused by the transversal exchange of water and sand between the flood plain and the main channel. By water and sand diversion experiments performed in 2002, it is verified that the overbank flood can effectively increase the bank-flush discharge. Finally, it is suggested that, without effective control of the sediment of the lower reach, the overbank flood within a certain range is favorable for flood control from a long-term point of view.