Numerical investigation of particle velocity distributions in aeolian sand transport

doi:10.1016/j.geomorph.2009.10.001

IMECH-IR > 环境力学重点实验室(2009-2011)

	Numerical investigation of particle velocity distributions in aeolian sand transport
	Kang LQ; Liu DY(刘大有)
发表期刊	Geomorphology
	2010
卷号	115 期号:1-2 页码:156-171
ISSN	0169-555X
摘要	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
收录类别	SCI
语种	英语
WOS记录号	WOS:000274843800015
关键词[WOS]	FLUIDIZED-BED ; WIND-TUNNEL ; SALTATION ; SIMULATION ; BEHAVIOR ; SURFACE ; FLUX ; GRAINS ; CLOUD ; AIR
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
项目资助者	National Natural Science Foundation of China [10532030] ; State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University [070207]
引用统计	被引频次：23[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/43587
专题	环境力学重点实验室(2009-2011)
通讯作者	Kang LQ
推荐引用方式 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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