Knowledge Resource Center for Ecological Environment in Arid Area
Shear stress partitioning in sparsely vegetated desert canopies | |
Wolfe, SA; Nickling, WG | |
通讯作者 | Wolfe, SA |
会议名称 | Workshop on the Response of Aeolian Processes to Global Climate Change |
会议日期 | MAR 24-29, 1994 |
会议地点 | ZZYZX, CA |
英文摘要 | Shear velocity ratios were derived for six neighbouring localities representing rangeland, abandoned farmland and a playa, in the semi-arid region of the Sonoran Desert. Near-surface and above-canopy wind speeds, mostly below saltation threshold, were used to evaluate the partitioning of shear velocities and shear stresses between the plant canopy and the surface. The technique utilized represents an alternative to the threshold shear velocity ratio (R(t)) approach of Musick and Gillette (Land Degradation and Rehabilitation, 1990, 2, 87-94) and results demonstrate the need for partitioning over a range of wind speeds. Shear velocity ratios were variable over the playa and abandoned farmland, while variance in near-surface wind speeds was highest over shrub-dominated sites. The relationship between lateral cover (L(c)) and shear velocity (R) is comparable to previous findings utilizing R(t), although methodological differences result in mean shear velocity ratios less than shear velocity ratios derived for threshold conditions. With respect to the model of Raupach ct al. (Journal of Geophysical Research, 1993, 98-D2, 3023-3029), this may be attributed to the difference between measured shear stresses and the average shear stress on the exposed surface. At high lateral covers, shear velocity ratios are lower than threshold shear velocity ratios due to increased wake interactions or decreased drag on the shrub elements at higher wind speeds. |
英文关键词 | wind erosion vegetation lateral cover shear stress partitioning |
来源出版物 | EARTH SURFACE PROCESSES AND LANDFORMS |
ISSN | 0197-9337 |
出版年 | 1996 |
卷号 | 21 |
期号 | 7 |
页码 | 607-619 |
出版者 | WILEY-BLACKWELL |
类型 | Article;Proceedings Paper |
语种 | 英语 |
国家 | CANADA |
收录类别 | SCI-E ; CPCI-S |
WOS记录号 | WOS:A1996UX59100003 |
WOS关键词 | WIND EROSION ; SURFACES |
WOS类目 | Geography, Physical ; Geosciences, Multidisciplinary |
WOS研究方向 | Physical Geography ; Geology |
资源类型 | 会议论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/291470 |
作者单位 | (1)UNIV GUELPH, DEPT GEOG, GUELPH, ON N1G 2W1, CANADA |
推荐引用方式 GB/T 7714 | Wolfe, SA,Nickling, WG. Shear stress partitioning in sparsely vegetated desert canopies[C]:WILEY-BLACKWELL,1996:607-619. |
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