the average of the (wind speed) distribu-
tion is given by
m =
AG(1+1=k) ; (2)
with gamma function, G, defined as usual. Wind power density, a measure of the energy flux
through an area perpendicular to the direction of motion, varies not only with the cube of wind
15
Figure 2. Annual modelled distributions (dashed lines) and corresponding Weibull fits
(solid lines) of wind speed at 50 mAGL, for two
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