A groyne is a coastal structure built from the shoreline into the water, typically made of wood, concrete, or stone. Its primary purpose is to control beach erosion and to protect the coast from waves and currents. Groynes work by interrupting the natural flow of sediment along the shore, which helps to build up and maintain beaches on one side while reducing erosion on that side. However, they can also lead to increased erosion on the down-drift side, as sediment transport patterns are altered.
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