Coastal Features Created By Erosion Sherry

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Information about Coastal Features Created By Erosion Sherry
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Published on November 19, 2008

Author: maliadamit

Source: slideshare.net

Coastal Features Created By Erosion

Along a coastline, there are often many features created by erosion. The most common of these are : Cliffs Headlands Bays Caves Arches Stacks

Cliffs

Headlands

Bays

Caves

Arches

Stacks

Cliffs : Cliffs are shaped through a combination of erosion & weathering. Soft rock erodes easily and creates gently sloping cliffs . Hard rock is more resistant and erodes slowly and creates steep cliffs .

Cliffs are shaped through a combination of erosion & weathering.

Soft rock erodes easily and creates gently sloping cliffs .

Hard rock is more resistant and erodes

slowly and creates steep cliffs .

 

Cliff Processes & Morphology The rate & cliff morphology depend on factors such as cliff erosion, commonly due to marine erosion & sub-aerial erosion. Factors include:

The rate & cliff morphology depend on factors such as cliff erosion, commonly due to marine erosion & sub-aerial erosion.

Factors include:

1 . Geological structure & lithology joint & fault rapid rate of erosion

2 . Hard rock cliff basalt & granite erode slowly - produce steep high cliffs Hard rock, such as basalt, resists wave erosion creating a headland and sea stacks.

2 . Hard rock cliff

basalt & granite erode slowly

- produce steep high cliffs

3 . Softer rock & glacial material weathered more quickly & mass movement result in less steep slope glacial material

3 . Softer rock & glacial material

weathered more quickly & mass

movement result in less steep slope

4 . Joint & bedding planes determine cliff formation & amount of material movement to cliff foot

4 . Joint & bedding planes

determine cliff formation & amount of

material movement to cliff foot

Rock type & structure influence nature sub-aerial processes deliver material to cliff foot sub-aerial erosion Cliff profile & cliff evolve depend on the effectiveness of sub-aerial processes on cliff face & strength of cliff material.

Hard rock & soft rock evolution are : Episodic & Cyclical: Material accumulates at the cliff foot, separated by longer periods of slower erosion, attrition and sediment transport as accumulated material is made smaller by attrition, then removed by marine action is itself episodic. As the toe armour is removed the cliff base is exposed to wave action and the erosion Cycle is repeated.

Done by: Md. Sharinoriman Md. Sharif Nancy Antas Nurazirah Hj Mohaiman Safriamizah Yayan

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