River cross profiles

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  • Created by: Kelleigh
  • Created on: 02-06-13 12:25

Upper course river profile

very narrow (1m wide) - little suspension to cause lateral erosion

shallow (30cm deep)

steep sided, v-shaped valleys - the channel is bordered by large and angular boulders, traction occurs (veritical erosion)

clear water - little suspension and some white water (rapids) - where the water is turbulent from large and angular boulders

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Middle course river profile

flat land on either side of channel, consequently flood plains may occurr - less traction to cause vertical erosion, there is saltation (vertical erosion), suspension of rocks (from hydraulic action, abrasion and attrition in the upper course) -  floodplains are beside the river channels because of meanders migrating from left to right, cutting away the valley and making it flat also, during a flood, the water deposits its load as there is less energy, creating flat land

small meaders, meander scars and ox bow lakes form

channel is wider (4-5m wide) - suspension (lateral erosion)

fewer rocks on bed

water is less clear - fewer rocks on channel bed, through attrition, so cloudier water, there aren't as many large and angular boulders so little or no white water present

Deeper channel - tributaries to the main course have increase the volume of water

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Lower course river profile

very wide  (50m)

deep (25m)

water flows smoothly

still big meanders - material is also deposited on the inside of a meander bend

the surronding land is flat and low (generally flood plains), it's close to the sea

dark and cloudy - more suspension

mudflats result where ther river enters the sea

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