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Groynes are narrow, shore-perpendicular hard structures designed to interrupt longshore sediment transport by trapping a portion of the sediment that would otherwise be transported alongshore. By doing so, groynes help to build and stabilize the beach environment. Groynes are generally solid, durable structures and are considered a hard-engineering protection measure.
Groynes are normally built on exposed and moderately exposed sedimentary coastlines to address erosion hazards. They can be constructed from a wide variety of materials including rock armour, concrete, dolos, tetrapods, steel piling and hardwood timber.