黄河下游河道均衡输沙关系研究

Study of equilibrium sediment transport of lower Yellow River

黄河下游河道不同的河道特性造就了河道冲淤演变的不均衡发展,本文以1960-1999年黄河下游水沙资料为基础,应用统计方法对黄河下游不同量级洪水与不同含沙量洪水的输沙规律进行了分析,提出了实现均衡输沙的水沙条件。结合实体模型试验资料对小浪底水库拦沙后期,黄河下游河道的冲淤演变趋势进行了预测,指出在后期运用过程中应注意上、下游河段输沙的均衡发展。

The unbalance evolution of scouring and silting in the lower Yellow River is caused by the different characteristics of river channel. On the basis of water and sediment data of the lower Yellow River in 1960 through 1999, a statistic method is used to analyze the relation between the magnitudes of channel deformation and the sedi- ment concentrations during floods in the lower Yellow River, and the conditions of equilibrium sediment transport is also given. Combined with the model experiments data, the evolution trend in the lower Yellow River in the late sediment-retaining period of Xiaolangdi Reservoir is analyzed, and the importance of the equilibrium development of the upper and lower reaches in the late sediment-retaining period of Xiaolangdi Reservoir is pointed out.