river discharge and delta formation.docx

river discharge and delta formation.docx - River sediment...

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River sediment discharge related to: 1.drainage area 2, climate precipitation, evaporation 3. vegetation 4. relief Reworking of delta sediments by 1. waves—wave energy 2. tides—tidal range 3. storms and coastal currents Delta shape (morphology) related to: -discharge effectiveness (DE) DE+Qs/wave power, WP Qs tells us how much sediment is being deposited WP tells us how much sediment is being reworked Components of a river system (in order) -drainage basin -alluvial valley -deltaic plain -receiving basin Drainage basin of Mississippi bounded by Rockies, Appalachians Tributaries =where sediment and water are sourced Distributaries =where river water and sediment are distributed to the ocean River deltas -deltas occur where sedimentation causes progradation (build out) of the shoreline -Herodotus: gave name in 400 BC due to triangle shape of Nile river River discharge cross section*velocity cross section=width*depth -more water discharge in northern rivers -more sediment discharge in southern rivers Why
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