Long Profile: changing processes

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  • Created by: Sharon
  • Created on: 08-04-15 14:24
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  • Long Profile:  Changing processes.
    • EROSION
      • Abrasion
        • Fragments rubbing bed and banks
      • Hydraulic action
        • Power of moving water
      • Attrition
        • Fragments striking each other
      • Corrosion
        • Minerals in rock disolved by acid in water
      • Vertical - upper
        • River cutting down to base level
      • Lateral - middle/lower
        • Energy widens channel as level at base
    • TRANSPORTATION
      • Traction
        • Stones rolled along the bed
      • Saltation
        • Small stones leap frog channel bed dislodging others
      • Suspension
        • small particles (sand/silt) carried
      • Solution
        • Disolved minerals transported
      • capacity
        • If velocity doubles, capacity increases X8
      • Competence
        • If velocity doubles, competence increases 64 times
    • DEPOSITION
      • When longer competent to carry load (reduced energy)
        • Reduction in gradient
        • Discharged reduced
        • Shallower water
        • Increased load size
        • River floods

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