黄河小北干流河段“揭河底”冲刷条件分析

On the Formation Conditions of "Bottom Tearing Scour" in Xiaobeigan Main Stream of the Yellow River

通过现象分析,在黄河小北干流河段小流量(1220m3/s～4600m3/s)和持续高含沙量(500kg/m3～790kg/m3)的情况下也可产生局部揭河底冲刷。小北干流河段河床已经具备了揭河底的边界条件,如果水沙条件具备,很可能再次发生“揭河底”。

Through the analysis of phenomena, this paper presents the conditions under which the 'bottom tearing scour'may occur in Xiaobeigan Main Stream of the Yellow River: the discharge of Yellow River is from 1 220 m3/s to 4 600 m3/s,and the sustainable silt concentration is from 500 kg/m3 to 790 kg/m3 meanwhile. Xiaobeigan Main Stream has be possessed of boundary condition of river bed for 'bottom tearing scour'now. There is huge possibility to form this scour again.