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| DOI | 10.1029/2020GL088050 |
| Turbulence-Based Model for Subthreshold Aeolian Saltation | |
| Rana S.; Anderson W.; Day M. | |
| 发表日期 | 2020 |
| ISSN | 0094-8276 |
| 卷号 | 47期号:15 |
| 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, subthreshold 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. ©2020. American Geophysical Union. All Rights Reserved. |
| 英文关键词 | Atmospheric turbulence; Large eddy simulation; Probability density function; Transport properties; Velocity; Dynamic property; Intermittency; Linear dependence; Model performance; Sand transport; Shear velocities; Surface shear; Turbulent fluctuation; Shear flow; eolian process; Mars; model validation; numerical model; saltation; turbulence |
| 语种 | 英语 |
| 来源期刊 | Geophysical Research Letters
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/170019 |
| 作者单位 | The University of Texas at Dallas, Richardson, TX, United States; The University of California, Los Angeles, CA, United States |
| 推荐引用方式 GB/T 7714 | Rana S.,Anderson W.,Day M.. Turbulence-Based Model for Subthreshold Aeolian Saltation[J],2020,47(15). |
| APA | Rana S.,Anderson W.,&Day M..(2020).Turbulence-Based Model for Subthreshold Aeolian Saltation.Geophysical Research Letters,47(15). |
| MLA | Rana S.,et al."Turbulence-Based Model for Subthreshold Aeolian Saltation".Geophysical Research Letters 47.15(2020). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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