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River erosion and transport
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River erosion and transport

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  • 1. River Processes
  • 2. Roles of a river
    • Rivers have energy that means they can do work. The work they do is
    • I) Erosion
    • Ii) Transportation
    • Iii) Deposition
  • 3.  
  • 4. Types of river erosion
    • Corrosion/abrasion –the wearing away of the bed and bank by the load carried by a river.
    • Corrasion/solution – the removal of chemicals expecially calcium which causes rocks to dissolve.
    • Hydraulic action- the force of air and water on the sides of rivers and in cracks
    • Attrition - the wearing away of the load carried by a river to create smaller, rounder particles.
  • 5.  
  • 6. River Transportation
    • Saltation – process of river transport by which small particles bounce along the bed.
    • Solution – process of river transport by which material is carried dissolved in the water.
    • Suspension – process of river transport by which material is carried along within the water.
    • Traction – process of river transport by which material is rolled along the bed.
  • 7.  
  • 8.  
  • 9. Deposition
    • Deposition – when a river loses energy and drops some or all of the material it is carrying.
    • Conditions under which rivers deposit material.