To support the development of marine renewable energies, the Port of Brest has undertaken the construction of a new terminal dedicated to the handling of goods related to their operation.
Several worksites have been launched, including that of the enclosing dyke, the first stage in the creation of a new 14-hectare polder that will house part of the facilities.
Key figures
14
ha of additional area
26
circular cofferdams
800,000 t
riprap
14
ha of additional area
26
circular cofferdams
800,000 t
riprap
14
ha of additional area
26
circular cofferdams
800,000 t
riprap
Engineering at the service of the Breton coastline
This contract, awarded to Bouygues Travaux Publics Régions France, involves the construction of an 890-metre-long arched dyke to close off an “enclosure” where the marine sediments dredged from the port will be stored, in other words 1.25 million m³ of sediment.
The breakwater consists of 26 circular cofferdams and 25 festoons made of flat sheet piles 21 to 33 metres long. This solution was preferred to a sloped breakwater because it allows for greater sediment storage. The breakwater also incorporates eco-reefs that retain water at low tide to preserve ecosystems.
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