Comparing mixing-length models of the diabatic wind profile over homogeneous terrain |
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| Authors: | Alfredo Peña Sven-Erik Gryning Charlotte Bay Hasager |
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| Institution: | 1. Wind Energy Division, 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: | Models of the diabatic wind profile over homogeneous terrain for the entire atmospheric boundary layer are developed using mixing-length theory and are compared to wind speed observations up to 300 m at the National Test Station for Wind Turbines at Høvsøre, Denmark. The measurements are performed within a wide range of atmospheric stability conditions, which allows a comparison of the models with the average wind profile computed in seven stability classes, showing a better agreement than compared to the traditional surface-layer wind profile. The wind profile is measured by combining cup anemometer and lidar observations, showing good agreement at the overlapping heights. The height of the boundary layer, a parameter required for the wind profile models, is estimated under neutral and stable conditions using surface-layer turbulence measurements, and under unstable conditions based on the aerosol backscatter profile from ceilometer observations. |
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