黄河泥沙颗粒卫星化现象的探索与研究

Exploration and Research on Sediment Particle Satellite Phenomenon of the Yellow River

利用动态泥沙粒形分析技术对黄河泥沙颗粒进行了形态分析,从微观上解释了黄河"揭河底"现象产生的机理:黄河泥沙的颗粒级配组成范围非常广,完全具备产生卫星化现象的客观条件;在泥沙输移过程中,粗细泥沙颗粒能形成河床层理淤积结构,中间层的小颗粒泥沙往往黏在大颗粒泥沙上形成不规则颗粒,从而引起泥沙颗粒的堆积,形成强度非常大的胶泥块,一旦遇到合适的水沙条件,就易产生"揭河底"现象。

Based on the speciation analysis of the sediment particles using dynamic sediment grain shape analysis techniques,the mechanism of bottom tearing phenomenon of the Yellow River was explained from the microscopic. The results of the analysis show that due to the wide range of particle size in the river,the sediment apt to get satellited. The large particles can be silted layeredly in the river bed,while the tiny particles ad-here to the irregular large ones and form rubber mud with high viscosity. Once encountering appropriate water and sediment condition,the bottom tearing phenomenon will be happened.