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Geography: The long profile
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- 1Define the long profile...Illustrates the changes in the altitude of the course of the river from its source, along the entire length of its channel to the river mouth
- 2What is the shape of the long profileThe long profile is smoothly concave, with the gradient being steeper in the upper course and becoming progressively gentler towards the mouth
- 3Total amount of erosion and deposition are balanced, so shows an eventual change from uneven to curved, known as the 'Graded Profile', what is it?The graded profile is a theoretical form of river long profile that exists when there is a balance between the rate of erosion and the rate of deposition
- 4Describe the upper stage of the long profileSteep gradient = lots of potential energy / river high above base level
- 5What are the processes at the upper stageErosion: mainly vertical / hydraulic action / attrition
Transportation: Mostly large boulders (traction/saltation) / some in suspension / little solution
Deposition: limited to large bedload - 6Describe the middle stage of the long profileGradient decreases: potential energy converts to more kinetic energy
- 7What are the processes at the middle stageErosion: less vertical / lateral erosion begins / some abrasion / attrition
Transportation: Smaller bedload moved by traction / suspension load increased
Deposition: on slip off slopes / across floodplain - 8Describe the lower stage of the long profileLots of kinetic energy; velocity and discharge are highest
Lower turbulence - 9What are the processes at the lower stageErosion: Erosion reduced; some lateral on outside bends of meanders
Transportation: Smaller particles by suspension / solution
Deposition: Smaller particles onto slip off slopes/levées and floodplains
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- Fichas sobre Geography: The long profile, creado por Imogen Raper el 25/04/2017.
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- Imogen Raper
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