Charnock’s Roughness Length Model and Non-dimensional Wind Profiles Over the Sea |
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| Authors: | Alfredo Peña Sven-Erik Gryning |
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| Institution: | 1.Wind Energy Department, Ris? National Laboratory for Sustainable Energy,Technical University of Denmark,Roskilde,Denmark;2.Department of Geography and Geology,University of Copenhagen,Copenhagen,Denmark |
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| 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. |
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| Keywords: | Charnock’ s relation Non-dimensional wind profiles Sea roughness Surface layer |
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