- Created by: Megan
- Created on: 13-06-12 19:04
- Beaches are a common feature of a coastline. Beaches are made up of eroded material that has been TRANSPORTED from elsewhere and DEPOSITED by the sea.
- CONSTRUCTIVE waves help to build up beaches. The material found on a beach (ie sand or shingle) depends on the geology of the area and wave energy.
- A cross-section of a beach is called a BEACH PROFILE. The shingle ridges often found towards the back of a beach are called BERMS.
- Spits are also created by DEPOSITION. A spit is an extended stretch of beach material that projects out to sea and is joined to the mainland at one end.
- Spits are formed where the prevailing wind blows at an angle to the coastline, resulting in LONGSHORE DRIFT. An example of a spit is SPURN HEAD.
Development of a spit:
1. LONGSHORE DRIFT moves material along the coastline.
2. A SPIT forms when the material is deposited.
3. Over time, the SPIT grows & develops a HOOK if wind direction changes further out.
4. Waves can not get past a SPIT, creating a SHELTERED area where SILT is DEPOSITED & MUD FLATS or SALT MARSHES form.
A TOMBOLO IS A SPIT CONNECTING AN ISLAND TO A MAINLAND. An example of a tombolo is CHESIL BEACH, which connects the Isle of Portland to the mainland of the Dorset coast.