Tetrapod (structure)

This article is about the structure. For four-limbed vertebrates, see Tetrapod.

Stored Tetrapod blocks

Numbered tetrapods protect an earlier sea wall in Ventnor, UK.

Tetrapods along the waterfront at Mumbai

In coastal engineering, a tetrapod is a four-legged concrete structure used as armour unit on breakwaters. The Tetrapod's shape is designed to dissipate the force of incoming waves by allowing water to flow around rather than against it, and to reduce displacement by allowing a random distribution of Tetrapods to mutually interlock.

Earlier barrier material used in breakwaters, such as boulders and conventional concrete blocks, tended to become dislodged over time by the force of the ocean constantly crashing against them. Tetrapods and similar structures are often numbered so any displacement that occurs can be monitored through satellite photos.

The unit was originally developed in 1950 by Laboratoire Dauphinois d'Hydraulique in Grenoble, France (now Sogreah ). They are no longer protected by a patent, and are widely used all over the world, produced by many contractors.

The Tetrapod inspired many similar concrete structures for use in breakwaters, including the Modified Cube (U.S., 1959), the Stabit (U.K., 1961), the Akmon (Netherlands, 1962), the Dolos (South Africa, 1963), the Seabee (Australia, 1978), the Accropode (France, 1981), the Hollow Cube (Germany, 1991), the A-jack (U.S., 1998), and the Xbloc (Netherlands, 2001), among others. In Japan, the word Tetrapod is often used as a generic name for wave-dissipating blocks including other types and shapes.

See also

• Artificial reef
• Breakwater (structure)
• Coastal management
• Coastal erosion
• Dolos
• KOLOS
• Ocean surface wave
• Seawall
• Xbloc

External links

• Japan Times - Tetrapods
• Japan Times - TETRAPODISTAS Beauty beheld in huge concrete forms
• Building a Tetrapod Figure in AutoQ3D
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