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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
    • 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.
      • 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: