made of rock. The Mulberry harbours were mobile breakwaters that were towed into place to create an artificial harbour during the 1944 Allied invasion of Normandy.

Types

Types of breakwaters include vertical wall breakwater, mound breakwater and mound with superstructure or composite breakwater.

A breakwater structure is designed to absorb the energy of the waves that hit it, either by using mass (e.g. with caissons), or by using