关键词: 非均匀沙, 粒径分布, 输沙量

Abstract: Most of aeolian physics researches focus on field observation of wind blown sand and numerical simulation for saltation of sand grains with the uniform diameter size. Therefore, the numerical study for nonuniform sand grains seems very necessary. In this paper, computational method is employed to simulate saltation movement of sand grains with various diameters. We analyzed the saltation movement of sand particles with seven different particle size distributions respectively. The results show that the air flow has more powerful transporting ability for nonuniform particles than that for uniform particles at the same wind velocity when the average grain diameters are identical. Meanwhile, when saltation movement comes to steady state there exist different saltation heights and lengths including related saturated saltation layer thicknesses for different particle size distributions.

Key words: nonuniform sand grain, particle size distribution, mass flux