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Tetrapod (structure)

Concrete breakwater element / From Wikipedia, the free encyclopedia

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A tetrapod is a form of wave-dissipating concrete block used to prevent erosion caused by weather and longshore drift, primarily to enforce coastal structures such as seawalls and breakwaters. Tetrapods are made of concrete, and use a tetrahedral shape to dissipate the force of incoming waves by allowing water to flow around rather than against them, and to reduce displacement by interlocking.[1][2]

Tetrapods on Graciosa Island, Azores
Tetrapods in Latvia
Tetrapods protecting a marina on Crete, Greece.