| 影响拜格诺结的若干因素分析 |
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| 引用本文： | 何丽红,武建军,郑晓静. 影响拜格诺结的若干因素分析[J]. 中国沙漠, 2003, 23(4): 347-354 |
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| 作者姓名： | 何丽红 武建军 郑晓静 |
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| 作者单位： | 1. 兰州大学 经济管理学院, 甘肃 兰州 730000;2. 兰州大学 力学系, 甘肃 兰州 730000 |
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| 基金项目： | 《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 |
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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's Kink)高度与其对应的风速及沙粒跃移高度的关系。
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| 关 键 词： | 风沙耦合 拜格诺结 跃移运动 风速廓线 |
| 文章编号： | 1000-694X(2003)04-0347-08 |
| 收稿时间： | 2002-03-29 |
| 修稿时间： | 2002-03-29 |
A Research on the Factors Effecting Bagnold's Kink |
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| HE Li-hong,WU Jian-jun,ZHENG Xiao-jing. A Research on the Factors Effecting Bagnold's Kink[J]. ournal of Desert Research, 2003, 23(4): 347-354 |
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| Authors: | HE Li-hong WU Jian-jun ZHENG Xiao-jing |
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| Affiliation: | 1. School of Economics and Management, Lanzhou University, Lanzhou 730000, China;2. Department of Mechanics, Lanzhou University, Lanzhou 730000, China |
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| 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. |
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| Keywords: | wind feedback mechanism Bagnold's kink saltation wind velocity profile |
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