Formation of Spits and Bars
- When there is a bend in the coastline, longshore drift carries the sand beyond the bend. It builds up as a sand spit.
- Behind the spit , the sheltered water becomes a salt marsh.
- The end of the spit is curved where it meets strong winds and waves.
- If longshore drift continues to extend the length of the spit , it may join up with the coastline on the other side of the opening, such as a bay.
- This results in the formation of a 'bar' with a 'lagoon' behind.
- The bar and lagoon at Slapton, Devon were formed when sea level was rising.
1 of 1