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River erosion and transport

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River erosion and transport

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

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