FLUVIAL PROCESSES

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Erosion - hydraulic action
- Force of water breaks rock particles away from river channel.
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Erosion - abrasion
- Eroded rocks picked up by the river scrape and rub against channel, wearing it away. - Most common.
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Erosion - attrition
- Eroded rocks picked up by river smash into each other and break into smaller fragments. - Their edges also get rounded off as they rub together. - The further the material travels, the more eroded it gets. - Decreases particle sizes during course.
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Erosion - solution
- River water dissolves some type of rock, e.g. chalk and limestone.
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Transportation - traction
- Large particles like boulders are pushed along river bed by force of water.
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Transportation - saltation
- Pebble-sized particles are bounced along river bed by force of water.
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Transportation - suspension
- Small particles like silt and clay are carried along by the water.
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Transportation - solution
- Soluble materials dissolve in the water and are carried along.
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What is deposition?
- When river drops eroded material its transporting. - Happens when river slows down (loses velocity).
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Reasons why rivers slow down and deposit material
- Volume of water in river falls. - Amount of eroded material in the water increases. - Water is shallower, e.g. on inside of river bend. - The river reaches its mouth.
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Other cards in this set

Card 2

Front

Erosion - abrasion

Back

- Eroded rocks picked up by the river scrape and rub against channel, wearing it away. - Most common.

Card 3

Front

Erosion - attrition

Back

Preview of the front of card 3

Card 4

Front

Erosion - solution

Back

Preview of the front of card 4

Card 5

Front

Transportation - traction

Back

Preview of the front of card 5
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