该文从小浪底水库建库前后黄河下游泥沙粒径粗细变化情况,分析总结出黄河下游河道河床质泥沙粒径的沿程变化规律。合理利用小浪底水库对水沙进行有效地控制和调节,对实现下游河道冲刷或不淤积,具有十分重要的意义。 Based on the changes of sediment particle size before and after the construction of the lower reaches of the Yellow River before and after the construction of the reservoir in the Xiaolangdi Reservoir, the variation regularity of sediment particle size along the river bed in the lower Yellow River was analyzed. The rational use of Xiaolangdi Reservoir to effectively control and regulate water and sediment is of great significance to realize the erosion of the downstream channel or not.