A prediction method for the size distribution of saltating particles above a mixed‐size bed,Earth Surface Processes and Landforms

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A prediction method for the size distribution of saltating particles above a mixed‐size bed
Earth Surface Processes and Landforms ( IF 2.8 ) Pub Date : 2020-03-16 , DOI: 10.1002/esp.4847
Li Liu ₁ , Tian‐Li Bo _{2,

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Affiliation

In aeolian saltation, the sand bed is a mixture of sand particle with a wide range of particle sizes. Generally, the particle size distribution (PSD) of saltating particles is ignored by previous aeolian transport models, which will result in differences between predictions and observations. To better understand the saltation process, a prediction method of the PSD of saltating particles was proposed in this article. The probability of contact between incident sand and bed sand was introduced into the particle‐bed collision process. An artificial PSD of the incident saltating particles was set as the initial condition. A stochastic particle‐bed collision model considering contact probability was then used in each iteration step to calculate a new PSD of saltating particles. Finally, the PSD of saltating particles can be determined when aeolian saltation reaches a steady state (saltation is in a steady state when its primary characteristics, such as horizontal mass flux and the concentration of saltating particles, remain approximately constant over time and distance). Meanwhile, according to the experimental results, a calculation formula for the contact parameter n is given, which characterizes the shielding effect of particles on each other. That is, if soil PSD and friction velocity were given, the PSD of saltating particles can be determined. Our results do not depend on the initial conditions, and the predicted results are consistent with the experimental results. It indicated that our method can be used to determine the PSD of saltating particles. © 2020 John Wiley & Sons, Ltd.

中文翻译：

混合床上方盐分颗粒尺寸分布的预测方法

在风成盐过程中，沙床是各种粒径的沙粒混合物。通常，盐分颗粒的粒度分布（PSD）被以前的风成因运输模型所忽略，这将导致预测和观测之间的差异。为了更好地了解盐析过程，提出了盐析颗粒PSD的预测方法。在颗粒床碰撞过程中引入了入射砂与床砂之间接触的可能性。将入射的盐分颗粒的人工PSD设置为初始条件。然后在每个迭代步骤中使用考虑了接触概率的随机粒子-床碰撞模型来计算盐化粒子的新PSD。最后，当风成盐作用达到稳定状态时，可以确定成盐颗粒的PSD（当其主要特性（例如水平质量通量和成盐颗粒的浓度）随时间和距离保持恒定时，成盐处于稳定状态）。同时，根据实验结果，得出接触参数的计算公式给出n，其表征了粒子彼此的屏蔽效果。也就是说，如果给出土壤PSD和摩擦速度，则可以确定盐化颗粒的PSD。我们的结果不取决于初始条件，并且预测结果与实验结果一致。这表明我们的方法可用于确定盐化颗粒的PSD。分级为4 +©2020 John Wiley＆Sons，Ltd.

更新日期：2020-03-16

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