Articles | Volume 4, issue 2
Research article
19 May 2016
Research article |  | 19 May 2016

Predicting the roughness length of turbulent flows over landscapes with multi-scale microtopography

Jon D. Pelletier and Jason P. Field

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Cited articles

Arya, S. P. S.: A drag partition theory for determining the large-scale roughness parameter and wind stress on the Arctic pack ice, J. Geophys. Res., 80, 3447–3454, 1975.
Bagnold, R. A.: The movement of desert sand, P. Roy. Soc. Lond. A Mat., 157, 594–620, 1938.
Bauer, B. O., Sherman, D. J., and Wolcott, J. F.: Sources of uncertainty in shear stress and roughness length estimates derived from velocity profiles, Prof. Geogr., 44, 453–464, 1992.
Bergeron, N. E. and Abrahams, A. D.: Estimating shear velocity and roughness length from velocity profiles, Water Resour. Res., 28, 2155–2158,, 1992.
Bertin, J. J. and Cummings, R. M.: Aerodynamics for Engineers, 6th Edn., Prentice-Hall, New York, 832 pp., 2013.
Short summary
The law of the wall is one of the fundamental equations at the boundary of atmospheric sciences and aeolian geomorphology. In this paper, we quantify the relationship between the key parameter of the law of the wall, i.e., the roughness length, and measures of microtopography. We propose a method for predicting the roughness length that works for landscapes with microtopography over a wide range of spatial scales. The method is tested against approximately 60 000 measurements of roughness length.