坡面非均匀风沙起动规律研究

onsidering the hiding exposure action among non-uniform sands, the incipient motion is studied by introducing the concepts of exposure degree, equivalent diameter and surface nowel. then, a formula for computing the threshold wind velocity of non-uniform blown sand is also derived. Finally, the formula derived on sloping sand is turned into one on flat bed surface, and the coefficients in the formula are determined by experimental data. The correlative coefficient between the calculated and the experimental data is 0.930, which suggests that the influence of nonuniformity of blown sand on incipient motion reflected by introducing the concepts of exposure degree, equivalent diameter and surface nowel is reasonable.