关键词: 风沙运动, 沙粒跃移, 模型, 计算机模拟

Abstract: Saltation, as the most important motion of blown sand grains, plays a vital role in building the bridge between intrinsic mechanism exploration and engineering application of sediment research. Important progress has been made in the recent years in determining speed distribution function of the lift-off particles, especially by numerical simulation. However, there are still many problems remained. A simple but more realistic collision model for grains is presented in this paper, with which the dynamic behavior of saltation particles from loose sedimentary bed is simulated by launching a particle onto the surface. The impacting angle and time interval are fixed at 11.5° and 10^-6 second respectively. Detailed discussion of saltation velocity is made, including spatial distribution; especially the magnitude distribution fits exponential regression very well, which is in good agreement with the previous experimental result. All these results in this work are helpful for understanding saltation process in aeolian sediment transport.

Key words: aeolian sediment transport, saltation, discrete element model