关键词: 初始启动, 平化运动, 缩移运动, 持相运动, 交替循环机制

Abstract: The initial start and vertical transportation of sand particle were analyzed in this paper.The results indicate that the most advantageous position to start sand particle is the inflexion with maximum, the next is the more undulate incline, the third is the dot with maximum, the forth is plane, the fifth is the dot with minimum and the last is the inflexion with minimum.The smoothing movement, wincing movement and holding phase movement may be the three forms of the particles' movement.The conditions of wind-carring starting sand are smaller diameter, gale, eddy field(uniform orientation with gale), instability and viscous flow;the conditions of impact-starting sand are bigger diameter, lower-speed wind, eddy field(contrary to wind), stability and turbulence flow.In the last, this paper brings forward a mechanism of alternate circle to explain the forming of sandstrorm.

Key words: initial start, smoothing movement, wincing movement, holding phase movement, mechanism of alternate circle