Theoretical analysis of the critical impact velocity of aeolian saltating grains to rupture microbiotic crusts

doi:10.6052/0459-1879-2005-3-2004-016

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Article Navigation > Chinese Journal of Theoretical and Applied Mechanics > 2005 > 37(3): 313-316

Theoretical analysis of the critical impact velocity of aeolian saltating grains to rupture microbiotic crusts[J]. Chinese Journal of Theoretical and Applied Mechanics, 2005, 37(3): 313-316. doi: 10.6052/0459-1879-2005-3-2004-016

Citation:

Theoretical analysis of the critical impact velocity of aeolian saltating grains to rupture microbiotic crusts[J]. Chinese Journal of Theoretical and Applied Mechanics, 2005, 37(3): 313-316. doi: 10.6052/0459-1879-2005-3-2004-016

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Theoretical analysis of the critical impact velocity of aeolian saltating grains to rupture microbiotic crusts

doi: 10.6052/0459-1879-2005-3-2004-016

兰州大学力学系,730000

Publish Date: 2005-05-18

Abstract

Abstract

The rupture of a microbiotic crust under the impactof a single saltating grain was theoretically studied using the classical theoriesof elastic thin plate and plastic mechanics. A quantitative relation between thecritical impact velocity of saltating grain and the characteristics of microbioticcrust was obtained. The effects of microorganisms were taken into account throughthe values of Young's modulus, Possion ratio and the yield stress of microbiotic crust,which are mainly determined by component species, numbers, and development stagesetc. The current study indicates that a rigid and weak microbiotic crust ismore easily broken down by saltating grains than a soft and strong one. The formulawe obtained will be helpful to evaluate the relationship between the microbiotic crustand the motions of wind-driven grains.
- microbiotic crust,wind erosion,saltation,impact