Rivers and Landscapes - Different Types of Erosion
- Created by: BCDM
- Created on: 27-03-21 11:51
Hydraulic Action
- Hydraulic Action is the action of moving water.
- Fast flowing water will disturb loose materials such as sand.
- Riverbanks can be weakened and undermined, causing collapse
- Hydraulic Action is ineffective on solid, hard rock.
Abrasion
- Abrasion is when entrained material scrapes away the bed and banks.
- It can chip away at the solid rock, creating small particles that can be carried along and can smooth the bed and banks.
- Most downcutting of a channel is due to abrasion.
Attrition
- Attrition is caused when load particles crash into each other, making the particles smaller and rounder in shape.
- They get smaller as they go down the riverbanks.
Solution
- Dissolved Limestone is carried away in solution.
- This is most effective on limestones, but almost all rocks and partially soluble.
Transportation
- Material that has been entrained and then carried (transported) by a river is called a load.
- Faster flow enables more and bigger particles to be carried.
- Material carried in the body of water is the suspended load.
- Material carried along the channel is called the bedload.
- Bedload is moved by traction and saltation.
Deposition
- Deposition can occur at any point along the length of the river.
- It can be found in the same places as where erosion is taking place.
- Deposition occurs because there is not enough energy in the water to transport material
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