submergent landforms

  • Created by: beaw18
  • Created on: 24-04-19 11:38

climate change and sea level rise

  • increase in global temperature leads to melting of ice storing lare quantities of water 
  • melting causes volume of water in the ocean to increase
  • temperature rise increases size of water molecules which increases volume 
  • 1 degree rise in global temperatures leads to sea level rise of 2 m 
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  • submerged river valleys formed as the sea rises
  • lowest part of river course and flood plains may be fully submerged
  • higher lands at tops of valleys exposed 
  • cross section - shallow water becoming increasingly deep towards the centre 
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  • submerged glacial valleys 
  • steep, cliff-like valley sides
  • water is uniformly deep, often reaching over 1000 m
  • common in countries such as Norway 
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shingle beaches

  • when sea level falls, 'new land' emerges from the sea 
  • sediment accumulates on surface which has been deposited by rivers, meltwater streams and low-energy waves 
  • wave action pushes the sediments onshore 
  • some of sediments forms beaches at base of cliffs 
  • elsewhere may form tombolos or bars 
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modification of landforms

  • rias and fjords may be modified by wave processes by the present day sea level
  • also affected by sub-ariel processes and weathering 
    • may result in the reduction of steepness of fjord sides
  • water depths in fjords and rias will increase
  • marine erosion will increase due to stormier conditions and larger waves 
  • shingle beaches are especially vulnerable to modification: longshore drift etc
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