An experimental study on the susceptibility of crusted surfaces to wind erosion: A comparison of the strength properties of biotic and salt crusts
An experimental study on the susceptibility of crusted surfaces to wind erosion: A comparison of the strength properties of biotic and salt crusts
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DOI：
10.1016/j.geomorph.2005.05.003
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发表时间：
2005-12-01
期刊：
影响因子：
3.9
通讯作者：
Neuman, CM
中科院分区：
文献类型：
--
作者：
Langston, G;Neuman, CM
在许多研究中，已采用了贯入法来调查风成系统中结皮沉积物的强度与其颗粒撞击稳定性的关系。尽管这一方法在早期取得了成功，但关于贯入角的影响、疲劳的作用以及与地壳弹性相比极限强度的相对重要性等问题仍然存在。本文报告了一系列的比重计和风洞实验，考虑到这些影响的背景下，盐和生物结壳。结果表明，侵彻角度并不重要，但侵彻密度是重要的。在风洞实验中观察到的高密度穿透、反复加载和持续撞击导致的强度下降进一步证实，沉积结壳在物质迁移过程中逐渐变弱。表面的弹性似乎至少和极限强度一样重要。虽然盐壳要坚固得多，但在风洞研究中发现，盐壳比生物壳更快地分解和侵蚀。生物结壳具有显著的弹性，似乎可以提供某种保护，使其免受磨损。(c)2005 Elsevier B.V.保留所有权利。
Penetrometry has been employed in a number of studies investigating the strength of crusted sediments as related to their stability to particle impact in aeolian systems. Despite the early success of this procedure, questions remain concerning the effect of the angle of penetration, the role of fatigue, and the relative importance of the ultimate strength as compared to the elasticity of the crust. This paper reports on a series of penetrometer and wind tunnel experiments that consider these effects in the context of both salt and biotic crusts. The results demonstrate that the angle of penetration is not important but the density of penetrations is. The decreased strength observed with high densities of penetration, repeated loading, and continual impact in wind tunnel experiments provides further confirmation that sedimentary crusts progressively become weaker during mass transport events. The elasticity of the surface appears to be at least as important to consider as the ultimate strength. Although much stronger, the salt crusts were found to break down and erode sooner than biotic crusts in wind tunnel studies. The notable elasticity of biotic crusts appears to afford them some protection against abrasion. (c) 2005 Elsevier B.V. All rights reserved.