Longshore drift is the process that moves sand and other sediments along a shoreline. It is also referred to as longshore transport or littoral drift.
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The process of longshore drift is waves hit up against the sand and the sand grains are taken by the waves back into the sea and back to shore again, this is called swash ans backwash.
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Material can be transported along a beach via longshore drift;Waves approach beach at an angleMaterial is pushed up the beach by the swash in the same direction as the wave approachAs the water runs back down the beach the backwash drags material down at right angles to the beach lineOver a period of time sediment moves in this zig-zag fashion down the coast.Material can also be transported along a beach at low tide when the sand dries out by the wind (usually forming sand dunes)Material may also be transported up and down a beach by attrition. Waves may have fairly high energy so will pick up material and may loose energy further up the beach and therefore deposit it there.Might also be moved by saltation (waves carry slightly smaller sediment in the same way as attrition)Waves may be swash-aligned (waves hit beach straigt on, so sediment moved up and down beach) or drift-aligned (waves hit beach at right angles causing longshore drift)
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