摘要
给出了全面描述风沙耦合作用下沙粒跃移运动的理论模型,利用数值方法对风沙耦合作用以及空气上升力、Magnus力、静电力等因素对沙粒跃移运动和风速廓线的影响进行了研究,从而揭示出拜格诺结(Bagnold'sKink)高度与其对应的风速及沙粒跃移高度的关系。
A complete theoretical model with the wind feedback mechanism for steady state saltation is derived based on a simplified process of grainsurface 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 Bagnolds kink is a linear function of the top of the trajectory, and an exponential function of the wind velocity at the kink.
出处
《中国沙漠》
CSCD
北大核心
2003年第4期347-354,共8页
Journal of Desert Research
基金
<国家重点基础研究发展规划>"中国北方沙漠化过程及其防治研究"项目(G2000048702)
教育部科技重点项目资助