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4 of the coastal defenses are:

Sea Wall: Concrete wall- lasts long, expensive, effective against storms and rising sea level.

Revetments: Wooden planks- cheap, ugly.

Groynes: Prevent Long Shore Drift, cause no sand longer across the beach, not effective against large storms.

Beach feeding: Sucking sand up from under sea and putting in on beach- looks natural, expensive, every 3 months.

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