Stability effects on predicted wind speed profiles and power output at the Vindeby offshore wind farmMotta, Maurizio and Barthelmie, Rebecca J. and Voelund, Per (2004) Stability effects on predicted wind speed profiles and power output at the Vindeby offshore wind farm. e-WindEng, E-publishing (001). Full text available as:
AbstractA thorough knowledge of the variation of wind speed with height is essential to assess accurately wind power output at a certain site. A crucial role in affecting the wind speed profiles is played by atmospheric stability, which leads the simple, standard logarithmic approach to fail under non-neutral conditions. The typical shortage of information available offshore makes these tasks even more challenging at such sites. Two main topics are here addressed, using data from existing or potential offshore wind farm sites in Denmark: assessing the climatology of atmospheric stability, and subsequently estimating the wind profiles. The occurrence of different stability conditions is studied at a few measurement sites, both offshore and coastal, relative to various time scales (hour, season and year) and to a number of parameters, such as wind speed and direction, in order to isolate the general features, and disentangle possible synoptic footprints from local effects. The influence of different approaches in extrapolating the profiles from the available data has been investigated.
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