泥沙研究

采用实测资料分析的方法，研究了黄河内蒙古河段冲淤演变与水沙过程的响应关系。1968年刘家峡水库蓄水运用，1986年龙羊峡水库蓄水运用，都对进入内蒙古河段的水沙过程影响较大，主要表现为来水来沙减少，洪峰流量削减，洪水发生概率降低。与1968年以前相比，1968年以后，内蒙古河段淤积减轻，1986年以后，内蒙古河段淤积加重。内蒙古河段冲淤演变和水沙过程的响应关系表明，汛期来水量小，来沙系数大，流量过程参数小，水沙过程不利于输沙，河段汛期容易淤积；汛期来水量大，来沙系数小，流量过程参数大，水沙过程有利于输沙，河段汛期淤积减轻甚至转换为冲刷。

Based on the analysis of measured data, the relationship between erosion and deposition evolution and flow-sediment processes in the Inner Mongolia Reach of Yellow River has been studied. The result show that the operation of Liujiaxia Reservoir in 1968 and Longyangxia Reservoir in 1986 have a significant impact on the flow and sediment processes entering the Inner Mongolia Reach, which is mainly manifested in the reduction of incoming water and sediment, the reduction of peak discharge and the reduction of flood probability. Compared with that before 1968, the Inner Mongolia Reach has shown a reduction in deposition since 1968, and has been aggravated since 1986. The response relationship indicates that the flow and sediment process during flood season in the Inner Mongolia Reach with smaller inflow, larger coming sediment coefficient and smaller flow process parameters is not conducive to sediment transport, and the river channel is prone to sedimentation. On the contrary, the process of flow and sediment in flood season is conducive to sediment transport, and the sediment deposition is reduced or even converted to be scouring.