Influence of Wind-Wave Interaction on the Blockage Effect for Offshore Wind Farms

The blockage effect arises from the wind slowing down as it approaches the wind turbines. There is an individual blockage effect for every turbine position and a combined effect for the whole wind farm, which is larger than the sum of the individual effects.

Field measurements and simulation results have shown that blockage effects cause wind speed reductions upstream of a wind farm that are more pronounced and far-reaching than commonly assumed.

The size of the blockage effect offshore has been shown to depend on the state of the marine atmospheric boundary layer (MABL).

The project investigates how the wave-wind interaction of the MABL affects size of the blockage effect. This is accomplished through the development of a model chain which will be validated using field data from the Baltic Sea and Kattegatt.

A deliverable of the project is a characterisation with regards to blockage effects for different parts of the Baltic Sea and Kattegatt.