摘要： 2002～2004年，黄河水利委员会相继开展了3次基于不同调度 方式和不同空间尺度的调水调沙试验。本文中通过对试验期间小浪底水 库及黄河下游河道悬移质、床沙质泥沙颗粒级配在时间和空间上的变化 分析，说明小浪底水库淤粗排细有利于调整库区泥沙淤积形态和出库细 颗粒泥沙向大海输移；下游河道中悬移质泥沙平均中数粒径沿程变粗， 试验达到了全面冲刷河槽的目的。 

关键词：泥沙；中数粒径；调水调沙试验；黄河

Abstract: During 2002～2004, the Yellow River Conservancy Commission carried out 3 times of water and sediment regulations based on different regulation mode and different spatial scale. Through analysing the time and spatial change of grain size of suspended sediment and bed sediment in the Xiaolangdi reservoir and the lower Yellow River channel during the experiments, the paper shows that discharging fine sediment and keeping coarse sediment silted in Xiaolangdi reservoir benefits regulating siltation in reservoir area and the transportation of fine sediment discharged out of the reservoir to the Bohai sea and the average of medium particle diameter of suspended sediment in the lower Yellow River is coarser and coarser along the channel. The experiment has achieved the goal of all-around scouring of the river channel. 

Keywords: sediment; medium particle diameter; water and sediment regula tion experiment ; the Yellow River