Rivers Erosion

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  • Created by: Molly
  • Created on: 18-01-15 17:32
What 6 factors affect the rate of erosion?
Load, velocity, gradient, geology, pH, Human impact
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Solution
the removal of chemical ions, especially calcium. Form of erosion especially effective on chalk & limestone
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Hydraulic Action
Force of air and water on the sides of rivers and in cracks. Occurs as a river tumbles over a waterfall and erodes rocks below
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Abrasion
wearing away of the bed and bank by the load carried by the river
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Attrition
wearing away of the load carried by the river. It creates smaller, rounder particles
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How does the load affect rate of erosion?
Heavier & sharper the load, the greater the potential for erosion
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How does velocity affect rate of erosion?
The greater the velocity, the greater potential for erosion
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How does gradient affect the rate of erosion?
Increased gradient = increased rate of erosion
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How does the geology affect rate of erosion?
Weak, unconsolidated rocks such as sand and gravel are more easily eroded than consolidated rocks
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How does pH affect rate of erosion?
Rates of erosion are increased when water is more acidic
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How does human impact affect rate of erosion?
Deforestation, dams and bridges interfere with the natural flow of the river and frequently end up increasing the rate of erosion
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Unconsolidated rocks
Loose, broken material that is often easily eroded
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Consolidated rocks
Solid rocks or sediments that have been bonded together by a sedimentary cement
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Entrainment
Picking up particles from the ground/bed of the river
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Other cards in this set

Card 2

Front

Solution

Back

the removal of chemical ions, especially calcium. Form of erosion especially effective on chalk & limestone

Card 3

Front

Hydraulic Action

Back

Preview of the front of card 3

Card 4

Front

Abrasion

Back

Preview of the front of card 4

Card 5

Front

Attrition

Back

Preview of the front of card 5
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