Sea level change

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  • Sea Level Change
    • Eustatic: Wordlwide
      • Caused by change in volume of water in sea or change in shape of ocean basins.
      • Tectonic movements of the Earths crust which alters the shape and volume
      • Changes in climate: Increase in temperature causes melting ice sheets which increases sea level and causes water to expand
      • Decrease in temperature causes more snow and increases stored water as glaciers, decreasing sea level
    • Isostatic: Local
      • Caused by vertical movements of land relative to the sea. Any downward movement of land causes sea level to rise locally, while uplift causes level to fall
      • Tectonic uplift or depression, which occurs mostly at plate boundaries
      • Compression or decompression of the Earths crust due to accumulation of melting ice sheets. Slow uplift of land can continue for thousands of years after the weight of a retreating glacier has gone. Accumulation of sediment, mostly at the mouths of major rivers can also cause compession
      • Subsidence o land due to shrinkage after abstraction of groundwater (drainage of marshland
    • Submergence features
      • Rias: drowned river valley
        • River valleys partially submerged. Gentle long & cross-profile. Wide and deep at mouth, narrow and shallow inland
      • Fjords: Drowned glacial valley
        • Straight and narrow with steep sides, shallow mouth and deep inland. Located where glaciers were able to erode below sea-level.
      • Dalmatian Coastline: flooded valleys leaving islands parallel to coastline
      • When sea level rises
    • Emergence features
      • Raised beaches: when the fall in sea level exposes wave-cut platforms and their beaches.
      • When sea level falls
      • Relict cliffs: cliffs above raised beaches are no longer eroded by the sea and get covered with vegetation.
    • Predicted sea level change
      • More frequent and sever coastal flooding
      • Submergence of low-lying islands
      • Untitled
  • River valleys partially submerged. Gentle long & cross-profile. Wide and deep at mouth, narrow and shallow inland

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