Physics of Wind Parks - Wind Energy Meteorology: Atmospheric Physics for Wind Power Generation - page 144

Fig. 6.6 Frequency distribution of atmospheric stability at 80 m height at the mast FINO1 in the
German Bight. Bin width is 0.1
Fig. 6.7 Frequency distribution of wind speed reduction at hub height in the park interior (top)
and of power yield reduction (below) using the stability data from Fig. 6.6 . Bin width is 0.02
survival speed, the most dangerous feature is the rapid increase of wind speed
connected with a rapid wind direction change when a tornado approaches a wind
turbine. There is no reasonable alert time available.
Dotzek et al ( 2010 ) investigate the risk that an offshore wind park in the
German Bight will be hit by a waterspout. Assuming an area of about 100 km 2
(10 9 10 km 2 ) as typical for prospective offshore wind parks off the German