Sediment ejection of 'the bed scour by hyper-concentrated flow' flood under different operation modes of Sanmenxia Reservoir

摘要

From the historical data of "the bed scour by hyper-concentrated flow" flood the whole sediment and middle size coarse sediment discharge ratio of SanMenxiareservoir is smaller in the stage of flood detention and open discharge. Theflood peak is inharmonious with the sediment peak and the carrying capacity of flood peak is small when flood is passing over the dam. Under the harmonious water and sediment condition, the sediment is transported by flood easier in the lower channel.