Abstract
Phenomena such as internal boundary layers and low-level jets can cause short-term wind fluctuations resulting in the vertical wind profile deviating from its expected logarithmic shape. Analysis of several years of data from the 6 measurement heights on the 100m high coastal Skipheia mast reveals that the 10-minute averaged vertical wind profile deviates from the vertical wind profiles predicted by Monin-Obukhov similarity theory in 30 — 40% of the analyzed instances. Deviations were most commonly present in the form of 1 local maxima, and in more rare instances as 2 local maxima or a completely reversed and monotonically decreasing profile. Analyzing the onshore and offshore directional sectors reveals that offshore winds are less reliant on strong thermal gradients for local maxima to be present, and inflections also occur at higher wind speeds in the offshore sector. Inflections are found to be progressively more common at higher elevations regardless of the direction of incoming wind, and as the found inflection elevations are close to common wind turbine hub heights they represent a potential issue in wind engineering.
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