River transportation processes
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Transcript of River transportation processes
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7Works of river
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Previous lesson
River erosion
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River erosion
The process of wearing away of the rocks on the bed and banks of the river by the energy of the river flow.
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•River erosion also happens by the load carries on the river channel itself.
•The erosion rate varies with different volume and velocity.
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Processes involved in river erosion.
Corrasion (abrasion)
Attrition
Solution (corrosion)
Hydraulic action
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Types of river erosion
Vertical erosion
Headward erosion
Lateral erosion
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Vertical erosionRiver removes
material from river bed
By corrosion/abrasion process
Result:Deepen a river channel and create narrow V-shaped valley.
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Headward erosion
River cut its source
Results: lengthening of the river in the upstream direction
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Lateral erosion
The wearing away of river bank
By corrosion and solution process.
Result: widen the river and form a U shaped valley.
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River transportation
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Objectives:•Understand river transportation•Understand processes of river transportation (suspension, saltation, traction and solution)
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River transportation
When a river transport its load downstream.
The loads are the eroded materials
The volume and velocity of the river affects the river transportation rate
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4 ways of river transportation
Traction
Saltation
Suspension
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Traction
Material: Big rocks
How? Rolling and Dragged on the river bed
Why? They are heavy
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saltation
Material: small stones
How? Hopping and Bouncing on the river bed
Why? Caused by swirling water
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suspension
Material: fine (very small) rocks.
How? Carried along the river surface
Why? They are very light
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Solution
Material: dissolved materials
How? Carried along the water
Cant see by naked eyes
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Mnemonics:
Teacher (Traction)
SAya (SAltation)
SUka (SUspension)
SOtong (SOlution)
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Summary:
River trasportation Definition:
4 ways of river transportation: