DOI: 10.1002/2016JD026132
论文题名: An improved numerical model suggests potential differences of wind-blown sand between on Earth and Mars
作者: Bo T.L. ; Fu L.T. ; Liu L. ; Zheng X.J.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2017
卷: 122, 期: 11 起始页码: 5823
结束页码: 5836
语种: 英语
英文关键词: lift-off angle
; lift-off speed
; Mars
; saturation time
; transport rate
; wind-blown sand
英文摘要: The studies on wind-blown sand are crucial for understanding the change of climate and landscape on Mars. However, the disadvantages of the saltation models may result in unreliable predictions. In this paper, the saltation model has been improved from two main aspects, the aerodynamic surface roughness and the lift-off parameters. The aerodynamic surface roughness is expressed as function of particle size, wind strength, air density, and air dynamic viscosity. The lift-off parameters are improved through including the dependence of restitution coefficient on incident parameters and the correlation between saltating speed and angle. The improved model proved to be capable of reproducing the observed data well in both stable stage and evolution process. The modeling of wind-blown sand is promoted by all improved aspects, and the dependence of restitution coefficient on incident parameters could not be ignored. The constant restitution coefficient and uncorrelated lift-off parameter distributions would lead to both the overestimation of the sand transport rate and apparent surface roughness and the delay of evolution process. The distribution of lift-off speed and the evolution of lift-off parameters on Mars are found to be different from those on Earth. This may thus suggest that it is inappropriate to predict the evolution of wind-blown sand by using the lift-off velocity obtained in steady state saltation. And it also may be problematic to predict the wind-blown sand on Mars through applying the lift-off velocity obtained upon terrestrial conditions directly. ©2017. American Geophysical Union. All Rights Reserved. 资助项目: 11232006
; 11421062
; 11490551
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62670
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Key Laboratory of Mechanics on Western Disaster and Environment, Department of Mechanics, Lanzhou University, Lanzhou, China; School of Mechanical Engineering, Chengdu University, Chengdu, China; School of Mechano-Electronic Engineering, Xidian University, Xi'an, China
Recommended Citation:
Bo T.L.,Fu L.T.,Liu L.,et al. An improved numerical model suggests potential differences of wind-blown sand between on Earth and Mars[J]. Journal of Geophysical Research: Atmospheres,2017-01-01,122(11)