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Aeolian Sediment Transport through Large Patches of Roughness in the Atmospheric Inertial SublayerRoughness influences the flux of wind driven sand transport. In this paper, we report on sediment transport measurements for four different surface roughness configurations composed of the same size (solid) roughness elements in the atmospheric inertial sublayer (ISL). Results of these tests indicate that sediment transport rates through patches of roughness in the atmospheric inertial sublayer are to a large extent controlled and scale proportionally with the roughness density (lambda = n b h/S, where n is number of elements of breadth b and height h in area S) of the surface. However, element size apparently increases the magnitude of the reduction beyond that attributable to lambda. A sediment transport model that incorporates the effect of shear stress partitioning appears to predict reasonably well the effect of roughness on sand transport in the cases where the roughness elements are less than or equal to 0.10 m in height. However, when the dimensions of the roughness itself are equivalent to or are greater than the range of saltation lengths (vertical and horizontal), additional interactions of the elements with the saltation cloud appear to reduce the transport efficiency.
Document ID
20070031588
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Gillies, John A.
(Desert Research Inst. Reno, NV, United States)
Nickling, Willilam G.
(Guelph Univ. Ontario, Canada)
King, James
(Guelph Univ. Ontario, Canada)
Date Acquired
August 23, 2013
Publication Date
May 5, 2006
Publication Information
Publication: Journal of Geophysical Research
Volume: 111
Subject Category
Geosciences (General)
Funding Number(s)
CONTRACT_GRANT: NAG5-12759
Distribution Limits
Public
Copyright
Other

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