The turbulence intensity describes the amount of the deviation of the wind speed from the average wind speed in a defined time interval t. The turbulence intensity [ I ] can be represented mathematically using the following formula:
In other words, turbulence intensity describes the strength of the change in wind speed in a time interval normalized to the mean wind speed. One can therefore say that a low turbulence intensity means that the wind is more stable.
The graph on the left shows the turbulence intensity for three selected locations in northern Germany during months 1-12 in 2017.
"Site A", for example, shows a significant increase in turbulence intensity during the summer months.
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