Arid
DOI10.1111/j.1365-3091.2006.00775.x
On the effect of moisture bonding forces in air-dry soils on threshold friction velocity of wind erosion
Ravi, Sujith; Zobeck, Ted M.; Over, Thomas M.; Okin, Gregory S.; D’Odorico, Paolo
通讯作者Ravi, Sujith
来源期刊SEDIMENTOLOGY
ISSN0037-0746
EISSN1365-3091
出版年2006
卷号53期号:3页码:597-609
英文摘要

Wind erosion is a dominant geomorphological process in arid and semi-arid regions with major impacts on regional climate and desertification. The erosion process occurs when the wind speed exceeds a certain threshold value, which depends on a number of factors including surface soil moisture. The understanding and modelling of aeolian erosion requires a better understanding of the soil erodibility associated with different moisture conditions. In arid regions during the dry season, the atmospheric humidity plays an important role in determining the surface moisture content and the threshold shear velocity. By a series of wind tunnel tests and theoretical analyses, this dependence of threshold velocity on near surface air humidity is shown for three soils of different textures: sand, sandy loam, and clay loam. The results show that the threshold shear velocity decreases with increasing values of relative humidity for values of relative humidity between about 40% and 65%, while above and below this range the threshold shear velocity increases with air humidity. A theoretical framework is developed to explain these dependencies assuming an equilibrium between the surface soil moisture and the humidity of the overlying atmosphere. The conditions under which soil-atmosphere equilibrium occurs were tested experimentally in the laboratory for different soils in order to determine the effect of grain surface area and texture on the time required to reach equilibrium starting from different initial conditions.


英文关键词aeolian processes desertification soil moisture wind erosion
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000237597000008
WOS关键词SEDIMENT ; ENTRAINMENT ; WATER ; CLIMATE
WOS类目Geology
WOS研究方向Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/153031
作者单位(1)Univ Virginia, Dept Environm Sci, Charlottesville, VA 22904 USA;(2)USDA, ARS, Wind Eros & Water Conservat Res Unit, Lubbock, TX 79415 USA;(3)Eastern Illinois Univ, Dept Geol & Geog, Charleston, IL 61920 USA
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GB/T 7714
Ravi, Sujith,Zobeck, Ted M.,Over, Thomas M.,et al. On the effect of moisture bonding forces in air-dry soils on threshold friction velocity of wind erosion[J],2006,53(3):597-609.
APA Ravi, Sujith,Zobeck, Ted M.,Over, Thomas M.,Okin, Gregory S.,&D’Odorico, Paolo.(2006).On the effect of moisture bonding forces in air-dry soils on threshold friction velocity of wind erosion.SEDIMENTOLOGY,53(3),597-609.
MLA Ravi, Sujith,et al."On the effect of moisture bonding forces in air-dry soils on threshold friction velocity of wind erosion".SEDIMENTOLOGY 53.3(2006):597-609.
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