Sea level change landforms

  • Created by: EEC2145
  • Created on: 01-03-23 12:23
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  • Landforms from sea level change
    • Emergent landforms
      • Occurs when sea level drops.
        • Sea level drops due to a cooler climate
          • Cooler temperatures means the water molecules contract. They become less dense and take up less volume.
            • Thermal compression
          • More precipitation falls as snow.
            • Lowering surface run off, hence lowering global sea levels
          • More surface water is stored in glaciers and ice sheets causing a reduction in water molecules in the ocean, lowering sea levels.
        • Wurm Glacial period (25,000 years ago)
          • Temps 9*C lower than today
      • Landforms with a raised beach.
        • Abandoned cliff
          • Above the current sea level, can have caves and other evidence it was previously in use
        • Marine terrace
          • Previous shore platform (if high energy environment)
          • A raised beach if in a low energy environment
        • Waterfalls that are left 'hanging' which would've just flown straight into the sea
        • Modifications
          • Although not being eroded by marine processes, Weathering still occurs
          • Vegetation may grow where previously it could not.
          • Biological weather may increase due to an increase in limpets.
    • Submergent
      • Occurs when sea levels rise
        • Sea levels rise due to a warmer climate
          • Warmer temperatures means the water molecules expand. They become more dense and take up more volume.
            • Thermal expansion
          • Surface stores in glaciers and ice sheets reduce as they melt.
            • Increase in surface run off, hence raising sea levels
        • Flandrian Transgression (6000 years ago)
      • Rias
        • Submerged river valley
        • Cross section has relatively shallow water getting deeper towards the centre.
        • Long section has uniform depth
        • A number of rias can be found on the South coast of Devon and Cornwall
      • Fjords
        • Submerged glacial valley
        • Steep sided v-shaped valleys
        • Incredibly deep, >1000m
        • Milford Sound, New Zealand
        • The Sogne Fjord in Norway is nearly 200km long
        • Marine processes still relatively high, deepening the fjord grasually
        • Sometimes are filled in slightly with sediments.


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