Longshore drift is the movement of sediment along the shore by ..., wave action. It only occurs when waves approach the beach at an angle as a result of..., prevailing winds which means waves moving up the beach at a 45 degree... , angle and carries material up and along the beach in the ..., swash. The backwash (waves moving back down the beach) carries .., sediment back down the beach at right angles to the sea, due to ..., gravity. This continues with each successive wave break and the sediment will.., move along the length of the beach unless.., trapped by man made structures such as groynes. These are built.., to create a deep beach which then absorbs.., the energy of the waves, protecting the coastline from erosion..

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