As part of a development project for the port of Brest and for the renewable marine energies (RME), the Brittany region, the project owner, has undertaken the construction of a new RME dedicated terminal. Several projects have been launched, including the enclosing breakwater, the first stage in the creation of a new 14-hectare polder that will accommodate some of the future installations. 

This contract, awarded to Bouygues Travaux Publics Régions France, includes the construction of an 860-metre-long arc-shaped breakwater, joined to the quay. This infrastructure forms an “enclosure” where all the marine sediments dredged in the port will be stored, i.e. 1.25 million m3. It is composed of 26 flat sheet pile gabions. It also incorporates eco-reefs to retain water at low tide in order to preserve the ecosystems present in Brest harbour. This solution proposed by Bouygues Travaux Publics Régions France as a variant had the advantage of increasing the storage volume in the enclosure and greatly reducing the emission of suspended matter generated by the construction of the filled breakwater originally planned as the basic solution, and was therefore preferred by the contracting client.