关键词: 风沙耦合, 拜格诺结, 跃移运动, 风速廓线

Abstract: A complete theoretical model with the wind feedback mechanism for steady state saltation is derived based on a simplified process of grain-surface impact.With the help of the algorithm presented in this paper,the effects on the trajectories of the saltating grains and the wind velocity profiles are displayed and analyzed for the interaction between wind and grains and the other factors such as aerodynamic lift,Magnus effect,and electrostatic force.Based on above numerical results,the regularities are further demonstrated that the height of Bagnold's kink is a linear function of the top of the trajectory,and an exponential function of the wind velocity at the kink.

Key words: wind feedback mechanism, Bagnold's kink, saltation, wind velocity profile