GSTDTAP  > 气候变化
DOI10.1029/2020GL088050
Turbulence‐Based Model for Sub‐Threshold Aeolian Saltation
Santosh Rana; William Anderson; Mackenzie Day
2020-07-17
发表期刊Geophysical Research Letters
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
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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
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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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