Coastal deposition

When the sea loses energy, it drops the sand, rock particles and pebbles it has been carrying.

This is called deposition.

Deposition happens when the swash is stronger than the backwash and is associated with constructive waves.

Conditions that encourage deposition

Deposition is likely to occur when:

  • waves enter an area of shallow water;
  • waves enter a sheltered area, e.g. a cove or bay;
  • there is little wind;
  • there is a good supply of material.
Photograph of a depositional beach in Northern Ireland: White Rock Bay

White Rock Bay, an example of a depositional beach in Northern Ireland.

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