Landforms of fluvial erosion and deposition

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  • Landforms of fluvial erosion and deposition
    • Waterfalls and rapids
      • Sudden change in gradient of river flowing downstream
      • Can be a result of:
        • Resistand band of rock occuring across the course of a river
        • Edge of a plateau
        • Rejuvenation of the area
      • High Force in upper Teesdale
    • Potholes
      • Cylindrical holes drilled into the rocky bed of a river by a turbulent high-velocity water loaded with pebbles
      • Pebbles become trapped in slight hollows and vertical eddies in water
      • Grinds by abrasion and attrition rounds and smooths pebbles caught reducing bedload
    • Braided channel
      • When a river is forces to split into several channels separated by islands
      • Mainly in rivers with large loads of sand and gravel
      • Happens with variable discharges
    • Meanders
      • Sinuous bends in a river
      • Created by alternating pools and riffles
      • Inner bank = Point Bar
    • Oxbow lakes
      • A feature of both erosion and deposition
      • Use a diagram to explain
    • Levées
      • If a river floods the velocity of water falls as it overflows banks
      • Results in deposition leaving raised banks on the sides of channels
      • More flooding = Bigger banks and Bigger Banks= better flooding defence
    • Delta
      • Feature of deposition at the mouth of a river into the sea or a lake
      • It occurs as the river energy decreases and dumps suspended material and anything carried

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