Follow-up measures

Monitoring of avifauna by terrestrial radar

Objectives and methodology

As the offshore radar can only be functional when the wind turbines are energized, monitoring by terrestrial radar is set up before and during construction. Specific monitoring will be implemented to assess micro/macro avoidance as well as migratory flows within the park during the operational phase (see avifauna monitoring sheet by maritime radar).

The main objectives of this monitoring of avifauna by terrestrial radar are to evaluate potential changes in the behavior of seabirds due to the presence of the park and to measure the migratory flow in order to better understand the importance of passages in bay of Saint-Brieuc.

A radar system is therefore installed on the Cap Fréhel site (point of the coast closest to the park) during the two main bird migration periods (April and October). For each monitoring, the radar system (vertical mode and horizontal mode) continuously measures migratory flows and flight heights over a period of one week.

Location of actions


Schedule and Status


Measure implemented

One week in April and one week in October from 2020 to 2026, i.e. in the pre-construction, construction and first 3 years of operation phases. 

Monitoring will also be carried out during the first year of dismantling.

    All follow-up measures

    Reduction measures

    Compensation measures

    Accompanying measures