Costal erosion

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  • Created by: Natalie
  • Created on: 24-03-14 19:05

1. Rotational Slip

  • rapid movement of rock down a side plane
  • saturated soil flows downhill, triggered by heavy rain
  • soft rock overlying hard rock is saturated by rain. Soft rock slumps downwards over hard rock
  • movement of individual soil particles when the ground is saturated.
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2. Abrasion

  • breaking wave traps air as it hits cliff face. Air is forced into cracks in rock face, creating pressure at this point. As wave retreats, pressure is released. Overtime this weaken the cliff face, and huge chunks of cliff can break off due to force o
  • the sea hurls already eroded material (sand, shingle, boulders) against cliff face. This breaks down the rock on the cliff face
  • sea water contains weak acids which work to slowly dissolve carbonated rocks such as limestone
  • the already eroded materials are eroded down further as the sediment knock together in the sea

3. Mudflow

  • rapid movement of rock down a side plane
  • saturated soil flows downhill, triggered by heavy rain
  • movement of individual soil particles when the ground is saturated.
  • individual rock fragments fall off a cliff face, due to freeze thaw

4. Soil Creep

  • individual rock fragments fall off a cliff face, due to freeze thaw
  • rapid movement of rock down a side plane
  • slow downhill movement of individual soil particles when the ground is saturated.
  • saturated soil flows downhill, triggered by heavy rain

5. Hydraulic action

  • the sea hurls already eroded material (sand, shingle, boulders) against cliff face. This breaks down the rock on the cliff face
  • breaking wave traps air as it hits cliff face. Air is forced into cracks in rock face, creating pressure at this point. As wave retreats, pressure is released. Overtime this weaken the cliff face, and huge chunks of cliff can break off due to force o
  • sea water contains weak acids which work to slowly dissolve carbonated rocks such as limestone
  • the already eroded materials are eroded down further as the sediment knock together in the sea

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