GGR201H1 Lecture Notes - Lecture 7: Sea Level, Nile Delta, Fly River
11 Jan 2017
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Document Summary
Deltas: alluvial deposits formed where rivers flow into standing bodies of water, decreasing in velocity and ability to carry sediment. Deltas develop where rivers supply sediment faster than removal rate by sea or lake. Delta morphology is a balance between fluvial sediment inputs and transport of sediments by waves and tides. Estuary: tidal inlet - partly enclosed bodies of water connected to the open sea (sea water mixes with fresh water) Sediment inputs are reworked and coastline landforms are eroded by wave and tidal actions. Sediments may be transported parallel to shoreline, offshore, or inshore. Coastline landforms adjust to average sea level. Eustatic sea level: global sea level which depends on volume of ocean water and volume of basins: volume of water controlled by glacial eustatic sea level, thermal expansion, volume of basin controlled by plate tectonics. Faster spreading of divergent boundary = more hot, buoyant crust and sea level up.
