Longshore Drift

Longshore Drift:

1. Waves approach the coast at an angle

2. Swash pushes sand and gravel up the beach at the same angle

3. Backwash carries sand and gravel back down the beach at 90° under the force of gravity

4. Sand and gravel move along the beach in a zigzag fashion

5. Sand is lighter than gravel so moves further up the beach.