Sea level change
- Created by: alexthelion_lee
- Created on: 09-04-14 17:42
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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
- Rias: drowned river valley
- 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
- Eustatic: Wordlwide
- River valleys partially submerged. Gentle long & cross-profile. Wide and deep at mouth, narrow and shallow inland
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