Assess the importance of Lithology in influencing the rate of coastal erosion. (12 marks)

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  • Assess the importance of Lithology in influencing the rate of coastal erosion. (12 marks)
    • Lithology
      • Reactivity
        • HIGHLY REACTIVE
          • A reactive rocky type is more susceptible to chemical weathering  eg. Limestone
      • Clastic or Crystaline?
        • CLASTIC
          • When the rocks are made up of smaller broken rocks they're more easily eroded
        • CRYSTALINE
          • These are formed in interlocking crystals which is much harder to erode
      • Weaknesses
        • If there are species in the rocks then they can make cracks within the rocks which increase the amount of weaknesses
          • Eg. Clams
        • WEAKNESSES
          • Weaknesses within the rocks mean that water can get into the cracks and erode outwards
        • NOT MANY WEAKNESSES
          • With only a few cracks it is harder for the water get into the cracks and make the larger
    • Vegetation
      • Binds Unconsolidated Sediment together
        • Unconsolidated sediment is easily eroded, the binding makes it stronger
    • Prevalence of Species
      • Biological Weathering
        • If there are species in the rocks then they can make cracks within the rocks which increase the amount of weaknesses
          • Eg. Clams
        • Plant species can also drop sees into the cracks which grow and create weaknesses
    • Geological Structure
      • Strata
      • Deformation
      • FAULTING
        • Faults allow water to fill the gaps and erode
    • Pore Water Pressure
      • Permeability and porosity
        • PERMEABLE
          • A permeable rock will allow water to flow through easily which means that it is eroded in the gaps as well as from the outside
            • A rock is permeable if it is Porous
      • HIGH PRESSURE
    • Season
      • WINTER
        • Destructive Waves- Berms are eroded by plunging waves
      • SUMMER
        • Constructive waves tend to deposit more sediment than they erode
    • KEY
      • Increses rates of Erosion
      • Decreases rates of Erosion

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