The effect of roughness elements on wind erosion threshold
Article first published online: 21 SEP 2012
This paper is not subject to U.S. copyright. Published in 1993 by the American Geophysical Union.
Journal of Geophysical Research: Atmospheres (1984–2012)
Volume 98, Issue D2, pages 3023–3029, 20 February 1993
How to Cite
1993), The effect of roughness elements on wind erosion threshold, J. Geophys. Res., 98(D2), 3023–3029, doi:10.1029/92JD01922., , and (
- Issue published online: 21 SEP 2012
- Article first published online: 21 SEP 2012
- Manuscript Accepted: 13 AUG 1992
- Manuscript Received: 7 FEB 1992
A theory is developed to describe the dependence upon roughness density of the threshold friction velocity ratio Rt, the ratio of the threshold friction velocity of an erodible surface without roughness to that of the surface with nonerodible roughness present. The roughness density is quantified by the frontal area index λ. The prediction is Rt = (1 − mσλ)−½(1 + mβλ)−½, where β is the ratio of the drag coefficient of an isolated roughness element on the surface to the drag coefficient of the substrate surface itself; σ is the basal-to-frontal area ratio of the roughness elements; and m (< 1) is a parameter accounting for differences between the average substrate surface stress and the maximum stress on the surface at any one point. The prediction is well verified by four independent data sets.