Costal erosion

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

1. Biological weathering

  • frequent cycle of wetting and drying are common on shore. Rocks rich in clay expand when wet and contracts when dry- causes cracks and breakdown
  • plant root can prise rocks apart on cliffs where they grow, creating small cracks which thicken and deepen with age. Birds, animal, and marine organisms dig burrows in cliff
  • when saltwater enter a rock, it is often evaporated, leaving behind salt crystals. These crystals grow larger and exert stress onto rock- causing it to break apart. Salt is also capable of corroding rock
  • water percolates into cracks in the rock, when it freezes it expands in volume by 10%- exerting stress and forces cracks to widen. Rocks are broken away and collected at base of cliff (scree). Fragments are picked up by sea and use in further erosion
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2. Rockfall

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

3. Salt weathering

  • when saltwater enter a rock, it is often evaporated, leaving behind salt crystals. These crystals grow larger and exert stress onto rock- causing it to break apart. Salt is also capable of corroding rock
  • water percolates into cracks in the rock, when it freezes it expands in volume by 10%- exerting stress and forces cracks to widen. Rocks are broken away and collected at base of cliff (scree). Fragments are picked up by sea and use in further erosion
  • frequent cycle of wetting and drying are common on shore. Rocks rich in clay expand when wet and contracts when dry- causes cracks and breakdown
  • plant root can prise rocks apart on cliffs where they grow, creating small cracks which thicken and deepen with age. Birds, animal, and marine organisms dig burrows in cliff

4. Mudflow

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

5. Landslide

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

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