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Landforms that are Produced as a Result of Costal Deposition

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Landforms that are Produced as a Result of Costal Deposition

Deposition is defined as 'the laying down of sediments, produced by

weathering and erosion of landmasses…'. Deposition occurs when

velocity decreases and therefore suspended sediment can no longer be

transported. There are four main landforms that are resulting form

landforms, beaches, spits and tombolos, forelands and barrier islands.

The area that I have studied is the Vale of Glamorgan Coastline form

Merthyr Mawr Warren to Breaksea Point and within this area there are

many depositional features. Most of the rock in the area was formed

during the Jurassic period approximately 150 million years ago. Most

of the rock formed in this period was limestone and shale. Lias is the

most commonly found shale in this area, a soft, reddish coloured rock.

Beaches are the most common of the four depositional features. They

are created by deposited material from breaking waves; the

constructive action is mainly effected by the swash. The swash is the

turbulent mass of water, which flows up the beach following the

breaking of a wave. The swash contains much of the suspended sediment,

and this sediment is then deposited upon the beach.

In the area that I have studied there are many sandy beaches and two

good examples of this are Dunraven Bay, and Traeth Mawr Beach. Both of

these beaches have headland on either side, and therefore can be

attributed to refraction. The erosion of these headlands reduces the

energy of the approaching waves, which also supplies a great amount of

eroded material. This then affects the energy of the wave as they

approach the beach and as a result have a lower velocity and this

leads to the deposition of their load on the beach.

There are also many storm beaches found along this area, for example

at Ogmore and Tresilian Bay. Storm beaches are created during storms

when there are high-energy waves. Large material is thrown high up

onto the beach creating berms. This leads to grading, with the largest

boulders at the furthest point from the sea, and the finer material