Arid
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
ISSN0197-9337
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
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Wolfe, SA,Nickling, WG. Shear stress partitioning in sparsely vegetated desert canopies[C]:WILEY-BLACKWELL,1996:607-619.
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