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DOI | 10.5194/acp-22-9525-2022 |
Impact of turbulence on aeolian particle entrainment: results from wind-tunnel experiments | |
Zhang, Jie; Li, Guang; Shi, Li; Huang, Ning; Shao, Yaping | |
发表日期 | 2022 |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
起始页码 | 9525 |
结束页码 | 9535 |
卷号 | 22期号:14页码:11 |
英文摘要 | We hypothesize that large eddies play a major role in the entrainment of aeolian particles. To test this, wind-tunnel experiments are carried out to measure the particle entrainment rate for various sizes and flow conditions. Wind-tunnel flows are usually neutrally stratified with no large eddies, which are typically seen in convective atmospheric boundary layers. Here, a novel technique is applied, by deploying a piece of randomly fluttering cloth, to generate large eddies similar to convective eddies, here referred to as quasi-convective turbulence. The characteristics of quasi-convective turbulence are analyzed with respect to neutral turbulence in the Monin-Obukhov similarity framework, and the probability distributions of surface shear stress are examined. We show that for a given mean flow speed and in comparison with neutral flow conditions, quasi-convective turbulence increases the surface shear stress and alters its probability distribution and hence substantially enhances the entrainment of sand and dust particles. Our hypothesis is thus confirmed by the wind-tunnel experiments. We also explain why large eddies are important to aeolian entrainment and transport. |
学科领域 | Environmental Sciences; Meteorology & Atmospheric Sciences |
语种 | 英语 |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
WOS记录号 | WOS:000828706400001 |
来源期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/273576 |
作者单位 | Lanzhou University; Lanzhou University; Lanzhou University; Swiss Federal Institutes of Technology Domain; Ecole Polytechnique Federale de Lausanne; University of Cologne |
推荐引用方式 GB/T 7714 | Zhang, Jie,Li, Guang,Shi, Li,et al. Impact of turbulence on aeolian particle entrainment: results from wind-tunnel experiments[J],2022,22(14):11. |
APA | Zhang, Jie,Li, Guang,Shi, Li,Huang, Ning,&Shao, Yaping.(2022).Impact of turbulence on aeolian particle entrainment: results from wind-tunnel experiments.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(14),11. |
MLA | Zhang, Jie,et al."Impact of turbulence on aeolian particle entrainment: results from wind-tunnel experiments".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.14(2022):11. |
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