摘要
基于野外观测实验和Langevin方程对风场脉动的描述,研究了脉动风场下沙粒的跃移运动以及风沙流结构特征。结果表明,脉动风场对沙粒的跃移运动有着显著的影响,沙粒粒径越小,脉动风场对跃移运动轨迹的影响越大;考虑风场脉动时给出的风沙流结构具有明显的分层特征,并与实验测量结果吻合得更好。
Based on experiment and the description of fluctuating wind field by Langevin equation, the characteristics of saltating grains as well as the windblown sand cloud have been discussed. The numerical simulations demonstrate that the fluctuating wind field exerts a great influence on saltation of grains, and the smaller the grain size is, the greater the influence would be. Moreover, the windblown sand cloud in the fluctuating wind field also shows a stratified characteristic and the mass fluxes agree well with the previous experiments.
出处
《中国沙漠》
CSCD
北大核心
2011年第3期602-606,共5页
Journal of Desert Research
基金
国家重点基础研究发展规划项目(2009CB421304)
国家自然科学基金项目(10772075,10772074)共同资助
关键词
脉动风场
风沙流结构
数值模拟
跃移运动
风沙耦合
fluctuating wind field
windblown sand tion between sand movement and wind cloud
numerical simulation
saltation
coupled interacfield
