Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2020GL088050 |
Turbulence‐Based Model for Sub‐Threshold Aeolian Saltation | |
Santosh Rana; William Anderson; Mackenzie Day | |
2020-07-17 | |
发表期刊 | Geophysical Research Letters
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出版年 | 2020 |
英文摘要 | Sand transport initiation and cessation occurs when the surface shear velocity exceeds a fluid threshold and falls below an impact threshold, respectively. Even when average shear velocity is below fluid threshold, turbulent fluctuations can initiate saltation, leading to turbulence‐driven transport intermittency. We leveraged the dynamic properties of large‐eddy simulation to recover a shear velocity time series due to atmospheric turbulence and recover a probability density function for saltation based on the frequency of events where wind has previously exceeded fluid‐threshold, but not yet dropped below impact threshold. By conditionally sampling, we can quantitatively predict the frequency of intermediate saltation. Results show that a compensated, sub‐threshold shear velocity exhibits linear dependence upon the actual shear velocity. This compensated shear velocity compares favorably against field data. Model performance under terrestrial and Mars conditions is also shown. |
领域 | 气候变化 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/284312 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | Santosh Rana,William Anderson,Mackenzie Day. Turbulence‐Based Model for Sub‐Threshold Aeolian Saltation[J]. Geophysical Research Letters,2020. |
APA | Santosh Rana,William Anderson,&Mackenzie Day.(2020).Turbulence‐Based Model for Sub‐Threshold Aeolian Saltation.Geophysical Research Letters. |
MLA | Santosh Rana,et al."Turbulence‐Based Model for Sub‐Threshold Aeolian Saltation".Geophysical Research Letters (2020). |
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