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.

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  • 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.

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  • 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.Image result for attrition river
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  • Dissolved Limestone is carried away in solution. 
  • This is most effective on limestones, but almost all rocks and partially soluble.

Image result for solution river

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  • 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.

Image result for transportation river meaning

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  • 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 materialSee the source image
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