Erosion is when the river wears away land and rocks and soil are picked up
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Hydraulic Action
The force of the water against the rocks/banks can cause air to be trapped in cracks and crevices. The pressure weakens the banks and gradually wears it away. It is the sheer force of the water causing this process.
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three things that happen in the rivers:
Erosion Transportation Deposition
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Abrasion
This is the process by which the bed and banks are worn down by the river’s load. The river throws rocks against the bed and banks, sometimes at high velocity.
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Attrition
Material (the load) carried by the river bump into each other and so are smoothed and broken down into smaller particles.
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Solution
This is the chemical action of river water. The acids in the water slowly dissolve the bed and the banks.
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Transportation
is the movement of rocks and soil by the river. A river transports material in 4 ways Traction Saltation Suspension Solution
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Traction
Boulders and pebbles are rolled along the river bed at times of high flow.
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Saltation
Medium sized particles are bounced along the river bed by the flow of water.
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Suspension
Fine clay and sand particles are carried along within the water body even at low river flow.
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Solution
Some minerals dissolve in water such as calcium carbonate. This requires very little energy.
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Deposition
This process will take place when the river loses energy. It is the dropping of material since the river loses it's energy. This will happen when the depth of the river decreases and also when the speed of the river decreases. When a river goes round
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Other cards in this set
Card 2
Front
Hydraulic Action
Back
The force of the water against the rocks/banks can cause air to be trapped in cracks and crevices. The pressure weakens the banks and gradually wears it away. It is the sheer force of the water causing this process.
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