Follow-up measures

Passive acoustic monitoring of marine mammals

Objectives and methodology

The objective of “passive acoustic” monitoring of marine mammals is to provide information on the activity of cetaceans in the area of ​​the offshore wind farm before work (reference state), during the construction, operation and dismantling phases. These were communicated to the CGS in April 2019.

Seven acoustic stations are positioned at different locations in the study area, each recording high frequencies (porpoises, clicks) and low frequencies (low and medium frequency cetaceans, ambient noise). Two stations are positioned in the park, and the other five are arranged in a star pattern around the park at 10 and 20 km distance.

Registration is effective 33% of the time. Equipment maintenance is carried out approximately every 3 months and the data obtained is processed back on land.

Location of actions


Mammal tracking buoys


10 km around the buoys


Implementation area


10 km around the location area


20 km around the location area

Schedule and Status


Measure currently implemented

This monitoring measure will be implemented several times:

– between March 2020 and 2024: pre-construction phases, construction and the first 2 years of operation

– 1 year of monitoring (date to be defined): half of the operating period

– 1 year of monitoring (date to be defined): the year preceding the dismantling of the park

All follow-up measures

Reduction measures

Compensation measures

Accompanying measures