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	Simulation of the probability of midair interparticle collisions in an aeolian saltating cloud
	Dong, ZB; Huang, N; Liu, XP
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
	2005-12-29
卷号	110期号:D24页码:9
ISSN号	2169-897X
DOI	10.1029/2005JD006070
通讯作者	Dong, ZB(zbdong@lzb.ac.cn)
英文摘要	[1] Midair interparticle collisions in aeolian saltation are generally neglected because they are considered to be rare. A theoretical simulation model was developed to calculate the probability of these collisions for uniform-sized sand. The collision probabilities during the ascending and descending stages and during the whole saltation process are calculated for saltating particles with different liftoff velocities and at different free-stream wind velocities on the basis of data for particle concentrations in the saltating cloud. The collision probability is also calculated on the basis of the probability distribution for liftoff velocities. The calculated probabilities reveal that midair collisions should not be neglected. They increase in frequency with increasing free-stream wind velocity and liftoff velocity and are nearly inevitable at high wind velocity. The collision probability is greater during the descending stage than during the ascending stage. Steady state saltation is maintained by feedback between the air stream and the saltating particles and between surface impacts and midair collisions. Increased surface impacts increase sand transport and the probability of midair collisions, but increased midair collisions may reduce surface impacts and sand transport. The feedback between surface impacts and midair collisions becomes more significant as wind velocity and sand transport increase.
收录类别	SCI
WOS关键词	SAND TRANSPORT ; WIND-TUNNEL ; GRAINS ; BED ; VELOCITY ; PROFILE ; MODEL ; AIR
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000234506500001
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2555713
专题	寒区旱区环境与工程研究所
通讯作者	Dong, ZB
作者单位	1.Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Key Lab Desert & Desertificat, Lanzhou 730000, Gansu, Peoples R China 2.Lanzhou Univ, Dept Mech, Lanzhou, Peoples R China 3.Beijing Normal Univ, Coll Resources Sci & Technol, Beijing 100875, Peoples R China
推荐引用方式 GB/T 7714	Dong, ZB,Huang, N,Liu, XP. Simulation of the probability of midair interparticle collisions in an aeolian saltating cloud[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2005,110(D24):9.
APA	Dong, ZB,Huang, N,&Liu, XP.(2005).Simulation of the probability of midair interparticle collisions in an aeolian saltating cloud.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,110(D24),9.
MLA	Dong, ZB,et al."Simulation of the probability of midair interparticle collisions in an aeolian saltating cloud".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 110.D24(2005):9.

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