River transportation processes
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River transportation processes

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river transportation processes

river transportation processes

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River transportation processes River transportation processes Presentation Transcript

  • Works of river
  • Previous lesson
    River erosion
  • View slide
  • River erosion
    The process of wearing away of the rocks on the bed and banks of the river by the energy of the river flow.
    View slide
    • River erosion also happens by the load carries on the river channel itself.
    • The erosion rate varies with different volume and velocity.
  • Processes involved in river erosion.
    Corrasion (abrasion)
    Attrition
    Solution (corrosion)
    Hydraulic action
  • Types of river erosion
    Vertical erosion
    Headward erosion
    Lateral erosion
  • Vertical erosion
    River removes material from river bed
    By corrosion/abrasion process
    Result:Deepen a river channel and create narrow V-shaped valley.
  • Headward erosion
    River cut its source
    Results: lengthening of the river in the upstream direction
  • Lateral erosion
    The wearing away of river bank
    By corrosion and solution process.
    Result: widen the river and form a U shaped valley.
  • River transportation
  • Objectives:
    • Understand river transportation
    • Understand processes of river transportation (suspension, saltation, traction and solution)
  • River transportation
    When a river transport its load downstream.
    The loads are the eroded materials
    The volume and velocity of the river affects the river transportation rate
  • 4 ways of river transportation
    Traction
    Saltation
    Suspension
  • Traction
    Material: Big rocks
    How? Rolling and Dragged on the river bed
    Why? They are heavy
  • saltation
    Material: small stones
    How? Hopping and Bouncing on the river bed
    Why? Caused by swirling water
  • suspension
    Material: fine (very small) rocks.
    How? Carried along the river surface
    Why? They are very light
  • Solution
    Material: dissolved materials
    How? Carried along the water
    Cant see by naked eyes
  • Mnemonics:
    Teacher (Traction)
    SAya (SAltation)
    SUka (SUspension)
    SOtong (SOlution)
  • Summary:
    Rivertrasportation
    Definition:
    4 ways of river transportation: