Determination of the wind induced detachment threshold for granular material on Mars using wind tunnel simulations
Determination of the wind induced detachment threshold for granular material on Mars using wind tunnel simulations
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DOI：
10.1016/j.icarus.2007.04.035
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发表时间：
2007-11-15
期刊：
影响因子：
3.2
通讯作者：
Rasmussen, K. R.
中科院分区：
文献类型：
--
作者：
Merrison, J. P.;Gunnlaugsson, H. P.;Rasmussen, K. R.
给出了火星模拟条件下风引起颗粒脱离的实验结果。应用简单的力平衡方程来量化从沙床去除玻璃球所需的风切应力。细粒火星尘埃的传输是通过空心玻璃球的分离来模拟的，空心玻璃球类似于使用火星模拟材料进行模拟时观察到的低质量密度尘埃聚集体。结果与美国宇航局维京着陆器在火星表面进行的除尘观察和风速测量结果非常吻合。这项工作支持这样的观点，即灰尘聚集体破碎使得风引起的灰尘夹带比固体沙粒的风切变低得多，并且可直接应用于全球灰尘输送和火星气候学的研究。 (C) 2007 Elsevier Inc. 保留所有权利。
Experimental results are presented of wind induced grain detachment under Mars simulation conditions. A simple force balance equation is applied to quantify the wind shear stress required for removal of glass spheres from a sand bed. The transport of fine grained martian dust is simulated by the detachment of hollow glass spheres which resemble low mass density dust aggregates observed to form during simulations when using Mars analogue material. The results agree well with observations of dust removal and wind speed measurements made by the NASA Viking landers at the martian surface. This work supports the suggestion that dust agregate fragmentation allows wind induced dust entrainment at substantially lower wind shear than that of solid sand grains and has direct application to the study of global dust transport and martian climatology. (C) 2007 Elsevier Inc. All rights reserved.