Coastal defences, Cobbolds Point, Felixstowe, Suffolk, UK
Groynes are structures that are constructed perpendicular to the shoreline, usually made of rocks or boulders, but can be wood or other materials. They are designed to help dissipate the energy of the waves crashing on the shore and slow down the movement of sediment along the coast, longshore drift, helping to prevent erosion and maintain the shape of the beach. Part of the way they work is to trap sand and other sediment that is carried by waves and currents.
