Sea Defences and Tetrapods

seawall, tetrapods, sea defences, Vicky Yardley
Iron moulds used to make concrete pods for sea-wall reinforcement. Photograph courtesy of Vicky Yardley, taken in Japan. The concrete pods are often designated `tetrapods' and are much more effective than just piling rocks, for two reasons. First, they interlock simply by their shape and mass, so the wave action does not dislodge them. Secondly, they permit the subdued flow of water through intervening channels and hence dissipate waves.

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