Wind velocity profiles with a blowing sand boundary layer: Theoretical simulation and experimental validation
文献类型：期刊论文
| 作者 | Dong, Zhibao; Mu, Qingsong; Wang, Hongtao |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
 |
| 出版日期 | 2007-10-10 |
| 卷号 | 112期号:D19页码:10 |
| ISSN号 | 2169-897X |
| DOI | 10.1029/2006JD007447 |
| 通讯作者 | Dong, Zhibao(zbdong@lzb.ac.cn) |
| 英文摘要 | Describing wind velocity profiles modified by the movement of blown sand is of continuing significance because they are thought to bear rich information about wind-sand interaction in a blowing sand cloud. This paper treats the saltating cloud as a fluidized particle flow and develops a mathematical model of the wind-sand interactions. The force exerted on the air by saltating particles is characterized by introducing a drag coefficient of the fluidized aeolian particle flow that is modified after the drag coefficients proposed for liquid fluidized particle flow. The resulting model was then used to simulate wind velocity profiles in the presence of a saltation cloud on the basis of the mean particle velocity and particle concentration profiles of the fluidized particle flow obtained from wind tunnel tests. The simulated velocity profiles agree well with those directly measured in the wind tunnel. The blowing sand boundary layer is divided into a saltation subboundary layer, in which saltating particles participate in momentum exchange with the wind, and an outer subboundary layer above the saltation subboundary layer. The wind velocity profiles within the saltation subboundary layer are characterized by convex-upward curves in a log (height)-linear (wind velocity) plot rather than the straight lines in the velocity profiles of clean wind. The upward convexity of the velocity profiles increases as wind velocity increases, suggesting that more wind momentum is absorbed by the saltating particles as the sand transport rate increases. The wind velocity profiles in the outer subboundary layer approach the Prandtl logarithmic law with the saltation subboundary layer providing increased aerodynamic roughness. Our results suggest that the wind shear velocity in the presence of a saltation cloud is a physical dimension that can reflect the effect of saltation. |
| 收录类别 | SCI |
| WOS关键词 | AEOLIAN SALTATION ; PARTICLES ; TRANSPORT ; GRAINS ; AIR ; COLLISIONS ; SEDIMENT ; SURFACE ; TUNNEL ; CLOUD |
| WOS研究方向 | Meteorology & Atmospheric Sciences |
| WOS类目 | Meteorology & Atmospheric Sciences |
| 语种 | 英语 |
| WOS记录号 | WOS:000250218900001 |
| 出版者 | AMER GEOPHYSICAL UNION |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2555916 |
| 专题 | 寒区旱区环境与工程研究所 |
| 通讯作者 | Dong, Zhibao |
| 作者单位 | 1.Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Key Lab Desert & Desertificat, Lanzhou 730000, Peoples R China 2.Lanzhou Univ, Sch Civil Engn & Mech, Lanzhou 730000, Peoples R China |
| 推荐引用方式 GB/T 7714 | Dong, Zhibao,Mu, Qingsong,Wang, Hongtao. Wind velocity profiles with a blowing sand boundary layer: Theoretical simulation and experimental validation[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2007,112(D19):10. |
| APA | Dong, Zhibao,Mu, Qingsong,&Wang, Hongtao.(2007).Wind velocity profiles with a blowing sand boundary layer: Theoretical simulation and experimental validation.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,112(D19),10. |
| MLA | Dong, Zhibao,et al."Wind velocity profiles with a blowing sand boundary layer: Theoretical simulation and experimental validation".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 112.D19(2007):10. |
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来源：寒区旱区环境与工程研究所
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