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A groyne is a type of breakwater or jetty, which projects from the shore of a coast or river to block the movement of sediment. In rivers, they are called "wing dams" or spur dykes, and channel water into a faster-moving channel, usually in the center of the river.

Groynes are used along beaches to prevent the removal of sand, or conversely to prevent the deposition of sandbars along shore.

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9y ago

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