DOI: 10.1002/jgrd.50155
论文题名: Theoretical prediction of electric fields in wind-blown sand
作者: Bo T. ; Zhang H. ; Zhu W. ; Zheng X.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 10 起始页码: 4494
结束页码: 4502
语种: 英语
英文关键词: horizontal electric field
; sand grain diameter
; sand particle concentration
; vertical electric field
; wind speed
; wind-blown sand transport
Scopus关键词: Coastal engineering
; Sand
; Wind effects
; Horizontal electric fields
; Sand grains
; Sand particles
; Vertical electric fields
; Wind speed
; Wind-blown sands
; Electric fields
; data acquisition
; electric field
; grain boundary
; grain size
; mass transport
; sand
; spatial variation
; stratification
; wind velocity
英文摘要: Existing experimental and theoretical studies have identified the existence of an electric field in wind-blown sand, whose strength is hundreds to thousands of times larger than that of the fair-weather electric field (around 120v m- 1) and is related to the intensity of the wind-blown sand transport. The direction of electric field is often upward pointing and opposite to that of the fair-weather electric field. In this study, we performed theoretical predictions of electric fields in wind-blown sand transport by assuming a constant charge-to-mass ratio (i.e., - 60μc kg- 1) of the saltating particles and considering the streamwise spatial variation of particle concentration in the evolution of wind-blown sand. Our results show that there exist both vertical and horizontal electric fields in wind-blown sand transport. The numerical results of vertical electric fields and mass flux are in good agreement with the experimental data measured by Schmidt et al. [1998] and Shao and Raupach [1992], respectively, which suggests that our model is valid. The horizontal electric field demonstrates a vertical stratification feature and is about one order of magnitude bigger than the fair-weather electric field. Finally, the effects of the wind speed and the sand grain diameter on electric fields are discussed. Key points It models the electric fields caused by variation of particle concentration.The electric field varies with streamwise distance before reaching equilibrium.Influences of wind speed and sand size on the electric field are investigated. ©2013. American Geophysical Union. All Rights Reserved. 资助项目: 11072097
; 11121202
; 11202088
; 11232006
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63720
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
There are no files associated with this item.
作者单位: Key Laboratory of Mechanics on Western Disaster and Environment, Lanzhou University, Lanzhou, China; Department of Mechanics, Lanzhou University, Lanzhou, 730000, China
Recommended Citation:
Bo T.,Zhang H.,Zhu W.,et al. Theoretical prediction of electric fields in wind-blown sand[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(10)