Environmental Engineering Reference
In-Depth Information
0.12
0.1
1.25
0.08
1.5
0.06
1.75
2
0.04
2.25
0.02
0
0
10
20
30
Wind Speed [m/s]
Figure 8: Weibull distributions for constant mean wind speed (8 m/s) and varying
k factors .
Figure 9: Weibull A and k parameters as a function of height for a roughness class
2 [ 16 ] .
it will be blowing faster. The mean wind speed is the average of the distribution.
The wind speed with the highest frequency is called the modal value.
Many different methods can be used for fi tting the two Weibull parameters to a
histogram. Since in general the observed histograms will show deviations, a fi tting
procedure must be selected which focuses on the wind speed range relevant to the
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