Channel Processes

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What are the 3 types of Channel Processes?
Erosion, Transport, Deposition
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What are the 4 types of Erosion?
Abrasion, Hydraulic Action, Corrosion, Attrition
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Why do Rivers erode?
Because they process energy
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What does their energy depend on?
Weight of water, height of river above base level, steepness of the channel
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What is Abrasion?
Scraping, and rubbing actions of materials carried along the river and doing this it causes the river bed wear away the banks and bed of the river.
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What is Hydraulic Action?
Caused by the sheer power of moving water. It puts pressure between the cracks and then as it builds it collapses.
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What is Corrosion?
Active on rocks that contain carbonates, such as limestone and chalk. The minerals dissolve in the water and carried away in solution.
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What is Attrition?
The reduction in size of fragments and particles within a river due to the processes described above. The fragments hit each other therefore they become smoother, smaller and more rounder.
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TRANSPORT
Energy that isn't lost through erosion or friction isa used to transport the rivers load.
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What are the 4 main ways a rivers transports its materials?
Traction, Saltation, Suspension, Solution
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What is Traction?
Large stones and boulders are rolled along the river bed by water moving downwards.This only happens at times of high discharge.
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What is Saltation?
Small stones bounce along the channel bed and this happens with high energy levels. Bouncing movements take place.
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What is Suspension?
Small particales of sand and silt are carried laong by the flow of the river
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Other cards in this set

Card 2

Front

What are the 4 types of Erosion?

Back

Abrasion, Hydraulic Action, Corrosion, Attrition

Card 3

Front

Why do Rivers erode?

Back

Preview of the front of card 3

Card 4

Front

What does their energy depend on?

Back

Preview of the front of card 4

Card 5

Front

What is Abrasion?

Back

Preview of the front of card 5
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