See Groin.

Narrow, shore-normal (approximately) structure built to reduce longshore currents, and/or to trap and retain beach material. Most groynes are of timber or rock, and extend from the beach head across the foreshore.

A projecting (often wooden) structure to stop sand shifting along a beach.

An arch construction formed by two segmental arches intersecting each other at right angles. A construction of timber and stone built out into a stream to retard or deflect the current.

Same as "Groin."

A barrier of wood or concrete, built to help reduce longshore drift and encourage deposition of sand to make the beach higher.

a breakwater that runs from a beach a short distance out to sea to break up the wave pattern and reduce erosion

Low barrier built out into the sea to stop the shifting of beach sand or tidal erosion.

Breakwater of rock, concrete, wood or metal erected on a beach to inhibit the movement of sand and shingle, and protect against longshore drift

shore protection structure built perpendicular to the shore, designed to trap sediment. abitat: usual natural surroundings and conditions of plants and animals.

A protective structure of stone or concrete that extends from the shore into the water to prevent a beach or riverbank from washing away.

A groyne (groin in the United States) is a rigid hydraulic structure built out from the shore (in coastal engineering) or from the bank (in rivers) and interrupts the flow of water and sediment. Groynes serve a multitude of functions.