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The feature of stratification in the blowing sand cloud

机译:吹沙云的分层特征

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The profiles of particle concentration in saltation layer versus height are calculated, by the motion equations for a saltating grain in conjunction with different probability distribution functions of the vertical liftoff velocities of grains and an empirical expression of wind velocity. The numerical results demonstrated that the stratification phenomenon exists in the particle concentration profiles and showed increasing, saturating and decreasing features, respectively, when the probability distribution functions of liftoff velocities adopted in the calculation are similar to a normal distribution or a two-parameter gamma distribution. When the distribution function of liftoff velocities is taken as an exponential form, the profile of particle concentration decreases monotonically. A numerical simulation of mass flux of grains, performed by the model suggested in this paper, is in reasonable accordance with the measured data.
机译:通过盐分谷物的运动方程,结合谷物垂直升速的不同概率分布函数和风速的经验表达式,计算盐分层中颗粒浓度与高度的关系。数值结果表明,当计算中所采用的提升速度的概率分布函数与正态分布或两参数伽玛分布相似时,颗粒物浓度分布中存在分层现象,并分别表现出增加,饱和和减少的特征。 。当提升速度的分布函数取指数形式时,颗粒浓度的分布单调减小。通过本文提出的模型进行的晶粒质量通量的数值模拟与测量数据是合理的。

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