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Fig. 5.28 Inclination angle of turbulence elements versus 80 m mean wind (only values larger
than 1 m/s have been evaluated here) speed at FINO1 for the year 2005. Diamonds: near neutral
stratification, triangles: stable stratification, squares: unstable stratification. Ray patterns in the
centre of the figure result from the limited resolution of wind speed data (two decimal digits)
Fig. 5.29 10 Hz wind speed data showing six selected gust events observed at FINO1 (full
curves). The dashed line shows the idealized ''Mexican hat'' defined as EOG in the IEC standard
case an extreme operating gust (EOG) as an event with a duration of 10.5 s for this
purpose. The typical temporal structure of the gust event starts with a decrease of
the wind speed followed by a larger increase and a final decrease before the
undisturbed wind speed is reached again. Due to its shape the temporal pattern of
this EOG is also called ''Mexican hat''. See Sect. A.5 for details.
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