CHARACTERIZING THE OBSERVED WIND RESOURCE - Wind Resource Assessment: A Practical Guide to Developing a Wind Project - page 137

9
8
7
6
5
4

Observed frequency
Weibull frequency

3
2
1
0

02468 0 2
Bin center wind speed (m/s)

14 16 18 20 22 24 >25.5

Figure 10-4. An example of an observed speed frequency distribution plotted against a fitted
Weibull curve. The observed distribution in this case is bimodal, that is, it has two peaks,
and does not follow the Weibull curve very well. At most sites, the Weibull function fits the
observed distribution better than this. Source : AWS Truepower.

Figure 10-5. Wind and energy rose plot example. Source: AWS Truepower.