Boundary-Layer Meteorology

, Volume 128, Issue 2, pp 191–203

Charnock’s Roughness Length Model and Non-dimensional Wind Profiles Over the Sea

Original Paper

DOI: 10.1007/s10546-008-9285-y

Cite this article as:
Peña, A. & Gryning, SE. Boundary-Layer Meteorol (2008) 128: 191. doi:10.1007/s10546-008-9285-y

Abstract

An analysis tool for the study of wind speed profiles over the water has been developed. The profiles are analysed using a modified dimensionless wind speed and dimensionless height, assuming that the sea surface roughness can be predicted by Charnock’s roughness length model. In this form, the roughness dependency on wind speed is extracted and the variations on the wind profile are due solely to atmospheric stability. The use of the Charnock’s non-dimensional wind profile is illustrated using data collected from a meteorological mast installed in the Danish North Sea. The best fit with the observed mean non-dimensional wind profile under neutral atmospheric conditions is found using a value of 1.2 × 10−2 for Charnock’s parameter. The stability correction on the neutral wind profile suggested by the Businger-Dyer relations was found to perform well over the sea.

Keywords

Charnock’s relationNon-dimensional wind profilesSea roughnessSurface layer

Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  1. 1.Wind Energy Department, Risø National Laboratory for Sustainable EnergyTechnical University of DenmarkRoskildeDenmark
  2. 2.Department of Geography and GeologyUniversity of CopenhagenCopenhagenDenmark