Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1111/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
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ISSN | 0037-0746 |
EISSN | 1365-3091 |
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 |
推荐引用方式 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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