黄河下游汛期平水期河槽冲淤调整分析

Analysis on Channel Scour and Fill Regulation in Normal Water Period of Flood Season of the Lower Yellow River

对黄河下游汛期平水期的水沙特点及其对河槽冲淤调整的影响进行了分析,结果表明:汛期平水期进入黄河下游河道的平均含沙量小于15 kg/m3、水沙搭配系数小于0.012 kg.s/m6时,下游河道以冲刷为主,反之则以淤积为主;从长时段看,汛期平水期下游主河槽处于淤积状态;汛期平水期进入下游的水量、沙量较少,对下游河道的冲淤影响相对较小;虽然汛期平水期冲淤量绝对值相对较小,但是其冲淤调整均在主河槽内进行,会对黄河下游防洪产生一定影响。

The paper analyzes the characteristics of sediment and discharge and its influence to channel scour and fill regulation in normal water period of flood season of the lower Yellow River.The outcomes show that when the mean sediment concentration of the lower channel in normal water period of flood season is less than 15 kg/m3 and silt-discharge coefficient less than 0.012 kg·s/m6,the lower channel is mainly scoured,otherwise is mainly deposited;the main channel of the lower reaches in the normal water period of flood season is in the deposition condition from the long interval point of view;the quantity of flow and sediment into the lower channel in the normal water period of flood season is less and the influence to scour and fill of the lower channel is relatively smaller and;although the Absolute value of scour and fill volume in the normal water period of flood season is relatively smaller,the scour and fill regulation is all carried out within the main channel which would have a certain effect to the flood control of the lower Yellow River.