River transportation processes

Works of river

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River erosion

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.

River erosion also happens by the load carries on the river channel itself.
The erosion rate varies with different volume and velocity.

Processes involved in river erosion.
Corrasion (abrasion)
Attrition
Solution (corrosion)
Hydraulic action

Types of river erosion
Vertical erosion
Headward erosion
Lateral erosion

Vertical erosion
River removes material from river bed
By corrosion/abrasion process
Result:Deepen a river channel and create narrow V-shaped valley.

Headward erosion
River cut its source
Results: lengthening of the river in the upstream direction

Lateral erosion
The wearing away of river bank
By corrosion and solution process.
Result: widen the river and form a U shaped valley.

River transportation

Objectives:
Understand river transportation
Understand processes of river transportation (suspension, saltation, traction and solution)

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

4 ways of river transportation
Traction
Saltation
Suspension

Traction
Material: Big rocks
How? Rolling and Dragged on the river bed
Why? They are heavy

saltation
Material: small stones
How? Hopping and Bouncing on the river bed
Why? Caused by swirling water

suspension
Material: fine (very small) rocks.
How? Carried along the river surface
Why? They are very light

Solution
Material: dissolved materials
How? Carried along the water
Cant see by naked eyes

Mnemonics:
Teacher (Traction)
SAya (SAltation)
SUka (SUspension)
SOtong (SOlution)

Summary:
Rivertrasportation
Definition:
4 ways of river transportation:

River transportation processes

by nuruljimmy1211

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River transportation processes Presentation Transcript