Conforming to New Condition of Water with Sediment and Speeding up Harnessing the Lower Yellow River

Based on measured materials on water,sediment,water level and cross section etc.,it analyzed the changes of incoming water and sediment of the lower Yellow River,the change of erosion or silt in the reaches of the lower Yellow River and the change of river slope etc..The results indicate that since putting the Xiaolangdi Reservoir into operation,especially after carrying out the operation of regulation water and sediment,in the past so the condition of less water with more sediment and both no appropriate collocation,that generated sustain deposition in the bed,the condition has changed to appropriate of water with sediment so that it has generated sustain erosion recently on the lower Yellow River.It is predicted that the coming sediment will not be more than that of the recent 10 years,it will generate erosion continually until basic equilibrium.On condition that new conditions of water and sediment,it proposes to modify the river harnessing guiding to stabilize the main channel,balance sediment transportation,show concern on river floodplain,diversions in both banks and detention area.Speeding up river harnessing and coordinate with reservoirs regulation and control water and sediment,so that bring about the new lower Yellow River which will be benefit to flood carrying,stabilization of the main channel,balance of sediment transportation,diversion in both banks and improving on living environment of resident of river floodplain and detention area.