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影响拜格诺结的若干因素分析 被引量:7

A Research on the Factors Effecting Bagnold's Kink
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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 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.
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
关键词 拜格诺结 风-沙耦合作用 沙粒跃移运动 数值方法 风速廓线 沙粒跃移高度 空气动力学 wind feedback mechanism Bagnold's kink saltation wind velocity profile
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参考文献10

  • 1黄宁,郑晓静,兰州大学.风沙跃移运动中的Magnus效应[J].兰州大学学报(自然科学版),2001,37(3):19-25. 被引量:14
  • 2Bagnold R A. The Physics of Blown Sand and Desert Dunes[M].New York : William Morrow & Company, 1941. 57 - 88.
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