Sand bar

• Bars form when there is a change in direction on a coastline which allows a sheltered area for deposition.
• Bars form when a spit grows across the entrance to a bay due to long shore drift (explain) (and more constructive waves than destructive waves).
• A spit growing across a bay connects two headlands and enclsoes a sheltered lagoon behind it.
• The lagoon forms as there is no strong flow of river water to the sea.
• Through time a lagoon (stagnant water) is filled in by deposition.
• Sand bar example: Chesil beach