| In the framework of the two fluid model of dilute dusty gases, the paper mainly discusses the aerodynamic of the dust and sand particles in the fully developed turbulent atmospheric boundary layer over an erodible surface are studied and the aerodynamic drag as well as the Saffman lifting and Gravity forces are considered. In the view of acting forces of single grain in airflow, Runge-Kutta algorithm and four-fifth Runge-Kutta-Felhber(RKF)algorithm was adopted to solve equation. The results showed that the floating state happened easier with the decreasing of the sand grain diameter. The rotational angular velocity (ω) and vertical initial lift-off velocity of sand grain(v0)were required to be higher when the sand grain diameter increased. Therefore, the sand grains with the diameter less than 70μm were the main grains suspended in the air. By studying the wind erosion characteristics in the region, some foundations are provided for the fur-ther research on the wind erosion dynamics characters and soil desertification prevention measures.The first chapter describes the desert and desertification of origin and the present development, the second chapter of the mechanical analysis of single grains of sand, but also leads to the movement of dust near the boundary layer motion model; Chapter Firstly, the choice of the motion parameters, and the introduction of two numerical methods to calculate the dust saltation model. Chapter IV under different friction velocity of different particle size in the different conditions of initial velocity and angular velocity trajectories under analysis of summary conclusions. |
