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中国沙漠 ›› 2005, Vol. 25 ›› Issue (4): 519-524.

• 研究论文 • 上一篇    下一篇

冲击角对风成沙纹形态影响的机理分析

李振山, 罗昊, 倪晋仁   

  1. 北京大学环境工程系水沙科学教育部重点实验室, 北京 100871
  • 收稿日期:2004-07-29 修回日期:2005-01-04 出版日期:2005-08-20 发布日期:2005-08-20
  • 作者简介:李振山(1965-),男(汉族),副教授,主要从事风沙地貌研究。E-mail:lizhenshan@iee.pku.edu.cn
  • 基金资助:
    国家自然科学基金项目(40371011;49625101)资助

Effect of Impacting-angle on Development of Aeolian Ripples

LI Zhen-shan, LUO Hao, NI Jin-ren   

  1. Department of Environmental Engineering, Peking University, Beijing, 100871, China;The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing, 100871, China
  • Received:2004-07-29 Revised:2005-01-04 Online:2005-08-20 Published:2005-08-20

摘要: 采用数值模拟的方法研究了沙粒冲击角对风成沙纹形成过程及其形态特征的影响。模拟中采用了均匀和正态两种冲击角分布情况。冲击角在10°~16°范围内均匀分布时,冲击角对沙纹波高影响不大,沙纹波长随冲击角影响系数的增加略有减小;沙粒跃移冲击角在5°~25°范围内呈正态分布时,冲击角影响系数增加时沙纹波高几乎没有变化,但沙纹波长却明显减小。

关键词: 风成沙纹, 数值模拟, 冲击角

Abstract: We studied the effect of particle impacting-angle on development of aeolian ripples using numerical simulation method. Both uniform and normal distributions of impacting angles are considered in simulation models. The impacting angles for uniform distribution are ranged between 10°~16°and those for normal distribution are between 5°~25°. Ripple heights simulated from two distribution models of impacting angles are similar to those produced from a single impacting angle of 13°, but ripple lengths simulated decrease slightly for uniform distribution and obviously for normal distributions.

Key words: aeolian ripple, numerical simulation, impacting angle

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