黄河下游河道冲淤平衡时输沙水量变化规律研究

Study on the Change Law of Sediment-Transport Water Volume in the Lower Yellow River during the Silt Stable Period

根据1950～2000年黄河下游河道汛期实测径流量和输沙量资料,计算得到了花园口—高村和艾山—利津河段处于冲淤平衡状态时的输沙量、输沙水量与单位输沙水量,并分析了三者之间的关系。研究表明:河段处于冲淤平衡状态时,输沙水量随着输沙量的增大而增大,单位输沙水量随着输沙量、输沙水量的增大而减小,输沙效率增大;随着河槽形态趋于窄深,一定输沙量所需输沙水量减小,单位输沙水量减小,输沙效率提高。

According the measured data of runoff and sediment volume from 1950 to 2000 in the lower reach of the Yellow River during flood season, this paper calculates the sediment-transport volume, the sediment-transport water volume and the unit sediment-transport water volume in the Huayuankou-Gaocun and Aishan-Lijin river reaches during silt stable period and analyzes the relation among them. The results indicates that under the silt stable state, the sediment-transport water volume increases with the sediment-transport volume increases,the unit sediment-transport water volume decreases with the sediment-transport water volume and the sediment-transport volume increases, at the same time the efficiency of the sediment-transport increases. With the section shape becomes narrower and deeper, the unit sediment-transport water volume decreases and the efficiency of the sediment-transport increases.