• 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.

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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.

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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.

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