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Resultaten onderzoek effect OWEZ op vogels

Research into the effects of Offshore Wind Farm Egmond aan Zee (OWEZ)

Flight paths, flight heights and flight intensity of birds

The aim of this research was to determine the species present, their flight heights, flight paths and the intensity of movements in and around the wind farm and how these were influenced by the wind farm.

The key movements studies were:

  • seasonal migrations of seabirds
  • seasonal migrations of land birds
  • flight movements of local birds

Download the final report


Gulls and cormorants were the commonest species recorded around the wind farm. Gannets, sea ducks and auks were also recorded, mostly during winter and migration periods. At night, large numbers of thrushes and other passerines were recorded passing over the wind farm.

Interestingly, some species such as gannet, auks, ducks and geese avoided the wind farm, while species such as cormorants and gulls showed little avoidance behaviour.

The greatest numbers of birds were recorded during autumn migration. The radar enabled birds at heights of up to 1.5 km to be recorded, although most were at heights below 70 m. These flight heights were influenced by weather conditions.

The effect of an offshore wind farm largely depends on its location, the bird community at that location and its size. Our research revealed that the effects of OWEZ on birds is kept minimal due to its location, small size and large spaces between turbines.  

More about observing flight activity with radars.

More about observing local birds.

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