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12742343
Coastal erosion
Description
Coastal erosion for AQA AS level geography
No tags specified
aqa
as
geography
coastal erosion
geography
a level
Mind Map by
Daire Ní Mhothlaigh
, updated more than 1 year ago
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Created by
Phoebe Fletcher
almost 10 years ago
Copied by
Daire Ní Mhothlaigh
over 6 years ago
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Resource summary
Coastal erosion
The geology of the area
Litology of the rock
Diferential eroision
Holderness - Glacial till - 2 metres per year eroded
Chalk - South East - 0.3 metres per year eroded
Granite - South West - 0.001 metres per year eroded
Rock type
E.g less reistant is Limestone
Human Activity
Sea defence
Managed retreat
Hold the line
Advance retreat
Coastal settlements
This would cause the cliff matrial to be pull down on more
Location
Techtonic Issues
How the rock is angled
Formation of Tsunamies
How exposed the area is
Headlands tend to be exposed
Can be concordent or discordent
Formation of storms
Aeolian Processes
Waves
Wave Diffraction
Types
Destructive
Constructive
Wave refraction
Weathering
Physical
Thermal expansion
Freeze Thaw weathering
More likely to happen in the north
Biological
Piddock fish dig into the rock
Vegetation force cracks open
Longshore drift
No material to prevent erosion
Acid rain
Coastal Landforms
Shore platforms
Wave-cut platforms
High-tide platforms
Low tide platforms
Most frequently found in high energy environments
Steep cliffs are replaced by lengthening platforms and a lower angle cliff
Having been subjected to marine processes
Coves
Form because there is a weakness in the rock, and the sea takes advantage of this
Example; Lulworth cove
Created when the limestone wall was breached during the periglacial period
The Chalk has not been eroded because of wave refraction on the bay
Headlands
Example of a stump:Old Harry, Dorset
Example of an Arch; Green Bridge of Wales
Media attachments
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219d8b3f-0e93-4f03-a309-33dbf82936bb.gif (image/gif)
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