Effects of reservoir and training on river regime evolution of the braided reach in the lower Yellow River

The effects of reservoir and training on river regime evolution of the braided reach in the lower Yellow River from Baihezhen to Gaochun is studied based on theoretical analysis and experimental data. The possibility of the river regime changing from braided to meandering is discussed. It is concluded that the existence of reservoir may result in the reduction of flood peak magnitude and decrease of sediment supplied to the downstream, which is in favor of forming a sinuous river. Whereas, river training works will reduce the intensity of channel sifting and promote the formation of a more stable main channel, thereby, accelerate the change of river regime from braided to sinuous. In view of the fact the Xiaolangdi Reservoir is put into operation, it is entirely possible for the lower Yellow River changing from braided into sinuous if necessary training works are added.