小浪底水库淤积与下游河道冲刷的关系-“黄河调水调沙的根据、效益和巨大潜力”之六

Relations between Deposition of the Xiaolangdi Reservoir and Scour of the Lower Yellow River Channel

从理论上证明紧靠水库下游河道的排沙比与水库排沙比有密切关系,并且几乎是单值的函数。利用三门峡水库20年运行资料,建立了其排沙比与下游河道排沙比的关系。同时用小浪底水库初期运用7年资料进行了检验,证明是符合实际的,进而给出了在不同来沙条件下,小浪底水库各种淤积情况时下游河道排沙比、冲刷数量、减淤比及减淤时间。下游河道排沙比与水库排沙比关系表明,河道冲刷量与减淤量均存在极大值,这表明该关系表达机理的深刻。显然这个关系对调水调沙是很重要的,可以立刻作出有效的选择。

The paper shows the close relationship of sediment delivery ratio of the lower river channel in the downstream of the reservoir with the reservoir sediment delivery ratio and the almost single-valued function in theory.It establishes the relations between reservoir sediment delivery ratio and sediment delivery ratio of the lower river channel by using 20-year operational data of Sanmenxia Reservoir.It also uses 7-year initial operational data of the Xiaolangdi Reservoir for checking,showing conforming to reality.Thus,it provides sediment delivery ratio,scouring amount,sediment reduction rate and time of sediment reduction under the different conditions of incoming sediment and various kinds of deposition of the Xiaolangdi Reservoir.The relation of sediment delivery ratio of the lower river channel and reservoir sediment delivery ratio shows that the channel scour and sediment reduction all have maximum value,showing its deep mechanism.It is important for a regulated discharge regime of the river and can immediately make effective selection.