黄河下游河道洪水冲淤临界水沙条件的研究

本文总结了以往对黄河下游河道冲淤临界条件的研究情况,根据非饱和输沙理论导出了河段排沙比与水沙系数关系,通过1960～1999年422场次洪水资料的统计分析,建立了黄河下游各河段的冲淤临界水沙条件,该水沙条件包括了洪水平均流量、含沙量,给出了黄河下游花园口以上、花园口～高村、高村～艾山、艾山～利津4个河段在不同三黑小(三门峡、黑石关和小董3站)水沙组合情况下的冲淤关系,该临界水沙条件可为小浪底水库调度决策以及黄河下游治理提供参考。

Study on critical conditions of scour- and-siltation in flood seasons in the lower Yellow River

The channel bed of the lower Yellow River changes tremendously during flood seasons because of great sediment concentrat ion. Critical conditions between scour and siltation are distinct in different river reaches. The authors summarized previous researches on the critical conditions for the lower Yellow River, analyzed statistically the hydrological data of 422 flood events from 1960 to 1999 and set up crit ical equations for 4 river reaches ( Huayuankou upward, Huayuankou to Gaocun, Gaocun to Aishan and Aishan to Lijin ) under different combinations of flow and sediment at 3 stations ( Sanmenxia, Heishiguan and Xiaodong) . The critical relations between flow discharges and sediment concentration for the 4 reaches were depicted. These relat ions may be used in the regulation of Xiaolangdi Reservoir in order to mitigate siltation for the lower Yellow River.