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
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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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