Velocity profile of a sand cloud blowing over a gravel surface
文献类型：期刊论文
| 作者 | Dong, ZB; Wang, HT; Liu, XP; Li, F; Zhao, AG |
| 刊名 | GEOMORPHOLOGY
 |
| 出版日期 | 2002-06-15 |
| 卷号 | 45期号:3-4页码:277-289 |
| 关键词 | aeolian process blowing sand cloud cloud velocity vertical profile particle turbulence gravel surface |
| ISSN号 | 0169-555X |
| 通讯作者 | Dong, ZB() |
| 英文摘要 | Particle dynamic analyzer (PDA) measurement technology was used to study the turbulent characteristics and the variation with height of the mean horizontal (in the downwind direction) and vertical (in the upward direction) particle velocity of a sand cloud blowing over a gravel surface. The results show that the mean horizontal particle velocity of the cloud increases with height, while the mean vertical velocity decreases with height. The variation of the mean horizontal velocity with height is, to some extent, similar to the wind profile that increases logarithmically with height in the turbulent boundary layer. The variation of the mean Vertical velocity with height is much more complex than that of the mean horizontal velocity. The increase of the resultant mean velocity with height can be expressed by a modified power function. Particle turbulence in the downwind direction decreases with height, while that in the vertical direction is complex. For fine sands (0.2-0.3 mm and 0.3-0.4 mm), there is a tendency for the particle turbulence to increase with height. In the very near-surface layer (< 4 mm), the movement of blown sand particles is very complex due to the rebound of particles on the bed and the interparticle collisions in the air. Wind starts to accelerate particle movement about 4 mm from the surface. The initial rebound on the bed and the interparticle collisions in the air have a profound effect on particle movement below that height, where particle concentration is very high and wind velocity is very low. (C) 2002 Elsevier Science B.V. All rights reserved. |
| 收录类别 | SCI |
| WOS关键词 | AEOLIAN SALTATION ; WIND-TUNNEL ; COLLISIONS ; GRAINS ; ENERGY ; SPEED ; BED |
| WOS研究方向 | Physical Geography ; Geology |
| WOS类目 | Geography, Physical ; Geosciences, Multidisciplinary |
| 语种 | 英语 |
| WOS记录号 | WOS:000176496600008 |
| 出版者 | ELSEVIER SCIENCE BV |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2556743 |
| 专题 | 寒区旱区环境与工程研究所 |
| 通讯作者 | Dong, ZB |
| 作者单位 | Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Lab Blown Sand Phys & Desert Environm, Lanzhou 730000, Peoples R China |
| 推荐引用方式 GB/T 7714 | Dong, ZB,Wang, HT,Liu, XP,et al. Velocity profile of a sand cloud blowing over a gravel surface[J]. GEOMORPHOLOGY,2002,45(3-4):277-289. |
| APA | Dong, ZB,Wang, HT,Liu, XP,Li, F,&Zhao, AG.(2002).Velocity profile of a sand cloud blowing over a gravel surface.GEOMORPHOLOGY,45(3-4),277-289. |
| MLA | Dong, ZB,et al."Velocity profile of a sand cloud blowing over a gravel surface".GEOMORPHOLOGY 45.3-4(2002):277-289. |
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来源：寒区旱区环境与工程研究所
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