They even affect whale migration! Shock! Horror! See FDOTM
Wind Turbines: Why do they hate our way of life? | Crikey
At 10km there is no way that the vortices would not be fully mixed with the entrained air and surrounding airmass. You would not be able to distinguish wind turbine wake from normal ground turbulence. Even on a strong wind day the vortex patterns quickly mix with the surrounding air.
Wind farm approval in NSW requires routine consultation with aviation groups in the area e.g. the new wind farm near Nimmitabel S of Cooma, the project team had to consult aviation users around Cooma, even glider pilots N of Cooma. If you are low enough to be worried about the turbulence and scud, you should be at an airport or in a safe paddock, and not even be airborne!