Artificial coral reefs to defend the coasts - Earth and Poles. They use 10 times less material than existing structures.
The artificial barriers are based on a central cylinder surrounded by spokes similar to those of a rudder. The researchers aim to use sustainable concrete, leaving spaces and niches in the structures to allow marine creatures to explore and find refuge. The various cylinders could then be connected to each other to form a long semi-permeable wall, which will have to be erected along the coast less than a kilometer from the shore.