Coastal Transportation

Longshore drift is the movement of sediment along the beach by waves.

• The swash moves up the beach at the angle determined by the direction of the prevailing wind.

• After the wave has broken, the backwash returns to the sea at a 90 degree angle.

• In this way, sand and pebbles are moved along the beach.

• The sand and pebbles will build up against a groyne.