Knowledge Management System of Institue of Mechanics, CAS
| Numerical investigation of particle velocity distributions in aeolian sand transport | |
Kang LQ; Liu DY(刘大有)
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| Source Publication | Geomorphology
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| 2010 | |
| Volume | 115Issue:1-2Pages:156-171 |
| ISSN | 0169-555X |
| Abstract | Particle velocity distribution in a blowing sand cloud is a reflection of saltation movement of many particles. Numerical analysis is performed for particle velocity distribution with a discrete particle model. The probability distributions of resultant particle velocity in the impact-entrainment process, particle horizontal and vertical velocities at different heights and the vertical velocity of ascending particles are analyzed. The probability distributions of resultant impact and lift-off velocities of saltating particles can be expressed by a log-normal function, and that of impact angle comply with an exponential function. The probability distribution of particle horizontal and vertical velocities at different heights shows a typical single-peak pattern. In the lower part of saltation layer, the particle horizontal velocity distribution is positively skewed. Further analysis shows that the probability density function of the vertical velocity of ascending particles is similar to the right-hand part of a normal distribution function, and a general equation is acquired for the probability density function of non-dimensional vertical velocity of ascending particles which is independent of diameter of saltating particles, wind strength and height. These distributions in the present numerical analysis are consistent with reported experimental results. The present investigation is important for understanding the saltation state in wind-blown sand movement. (C) 2009 Elsevier B.V. All rights reserved. |
| DOI | 10.1016/j.geomorph.2009.10.001 |
| URL | 查看原文 |
| Indexed By | SCI |
| Language | 英语 |
| WOS ID | WOS:000274843800015 |
| WOS Keyword | FLUIDIZED-BED ; WIND-TUNNEL ; SALTATION ; SIMULATION ; BEHAVIOR ; SURFACE ; FLUX ; GRAINS ; CLOUD ; AIR |
| WOS Research Area | Physical Geography ; Geology |
| WOS Subject | Geography, Physical ; Geosciences, Multidisciplinary |
| Funding Organization | National Natural Science Foundation of China [10532030] ; State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University [070207] |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/43587 |
| Collection | 环境力学重点实验室(2009-2011) |
| Corresponding Author | Kang LQ |
| Recommended Citation GB/T 7714 | Kang LQ,Liu DY. Numerical investigation of particle velocity distributions in aeolian sand transport[J]. Geomorphology,2010,115,1-2,:156-171. |
| APA | Kang LQ,&刘大有.(2010).Numerical investigation of particle velocity distributions in aeolian sand transport.Geomorphology,115(1-2),156-171. |
| MLA | Kang LQ,et al."Numerical investigation of particle velocity distributions in aeolian sand transport".Geomorphology 115.1-2(2010):156-171. |
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