A simple expression for wind erosion threshold friction velocity
Article first published online: 21 SEP 2012
Copyright 2000 by the American Geophysical Union.
Journal of Geophysical Research: Atmospheres (1984–2012)
Volume 105, Issue D17, pages 22437–22443, 16 September 2000
How to Cite
2000), A simple expression for wind erosion threshold friction velocity, J. Geophys. Res., 105(D17), 22437–22443, doi:10.1029/2000JD900304., and (
- Issue published online: 21 SEP 2012
- Article first published online: 21 SEP 2012
- Manuscript Accepted: 5 MAY 2000
- Manuscript Received: 19 NOV 1999
Threshold friction velocity u*t is the friction velocity at which wind erosion is initiated. While u*t is affected by a range of surface and soil properties, it is a function of particle size only for idealized soils. In this paper we present a simple expression for u*t for spherical particles loosely spread over a dry and bare surface. In this expression we consider the balance between the driving forces (aerodynamic drag and lift) and the retarding forces (cohesion and gravity) and assume that the cohesive force is proportional to particle size. It is found that u*t can be expressed as , with Y1 and Y2 being empirical constants. The new expression is both simple and effective.