Waking in the mist

DENMARK: A number of turbines at Dong Energy's Horns Rev 2 offshore wind project give a real-life lesson into the effects of turbine wake in this rare but spectacular photograph.

Taken on 25 January 2016 by BelAir Aviation from a series of images, the photograph shows a rare phenomenon that gives scientists a peek into the physical process occurring in the atmosphere.

It harks back to similar images taken at sister project Horns Rev 1 in 2008, when low-cloud levels were affected by the turbine turbulence.

The wind speed measured at the time of the photo was estimated at 10-13m/s. A paper by scientists at the Technical University of Denmark concluded the photographs are the first visually recorded examples of a drying process caused by the project, which is why the turbines towards the back of the pictures are not shrouded in fog.

Completed in 2009, Horns Rev 2 comprises 91 Siemens SWT-2.3-93 turbines, 31km off the Danish west coast.

The turbines have a hub height of approximately 68 metres above sea level.

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