The German Meteorological Service has determined the following dependency of near-ground wind speeds on the altitude for open land in the region of Stuttgart (see figure 8.1):

The ten temporary measuring stations which carried out wind measurements are characterized by uses or special topographic positions and therefore show significant deviations from the average dependency on the altitude of open land wind speeds.

Use-related and position-related corrections were effected for the representation of the average wind speed near the ground, i.e. 6 m above ground in this case, as the roughness of the earth's surface due to buildings, plants and a marked topographic structure leads to various changes in the wind field (GERTH, 1986).

Figure 8.2 shows that the vertical wind profiles vary significantly according to the way the surface is used. What you can see in the figure is both a decrease in the wind speed towards the city centre and high-reaching disturbances of the wind field in the inner city.