Rivers - Depositional Landforms

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  • Created by: TomT254
  • Created on: 31-01-16 13:22
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  • Rivers - Depositional Landforms
    • Braiding Channels
      • Braiding occurs when a river is carrying a lot of eroded sediment
        • If the rivers velocity drops or the sediment load becomes to much then it is deposited in the channel.
          • This causes the river to divide into small, winding channels that will eventually re-join to form on channel.
      • If the rivers velocity drops or the sediment load becomes to much then it is deposited in the channel.
        • This causes the river to divide into small, winding channels that will eventually re-join to form on channel.
    • Levees
      • Levees are natural, raised embankments formed when a river overflows its banks.
      • During a flood sediment in the river is deposited across the whole food plain as the river loses velocity and energy due to increased friction
        • Levees are natural, raised embankments formed when a river overflows its banks.
        • Heaviest material like sand and gravel is dropped first closest to the river channel.
          • Over time, the material builds up on the river bank, creating a levee.
          • Levees
            • During a flood sediment in the river is deposited across the whole food plain as the river loses velocity and energy due to increased friction
              • Heaviest material like sand and gravel is dropped first closest to the river channel.
                • Over time, the material builds up on the river bank, creating a levee.
    • Flood plains
      • When a river overflows its banks and floods the flat lands either side of the river, there's an increase in the wetted perimeter and a reduction in the hydraulic radius.
      • This increases friction, reducing the velocity of the river and causing fine silt and sand to be deposited across the flood plain.
        • When a river overflows its banks and floods the flat lands either side of the river, there's an increase in the wetted perimeter and a reduction in the hydraulic radius.
  • Deltas
    • As the river reaches a lake or sea, the energy is absorbed b the slower moving water.
      • This causes the river to deposit its load, this then builds up on the sea bed until this rises above sea level partially blocking the mouth of the river.
        • Deltas
          • As the river reaches a lake or sea, the energy is absorbed b the slower moving water.
            • This causes the river to deposit its load, this then builds up on the sea bed until this rises above sea level partially blocking the mouth of the river.
              • Then river has to braid into several distributaries in order to reach the sea forming a delta.
          • Rivers - Depositional Landforms
            • Braiding Channels
              • Braiding occurs when a river is carrying a lot of eroded sediment
              • Flood plains
                • This increases friction, reducing the velocity of the river and causing fine silt and sand to be deposited across the flood plain.
              • Then river has to braid into several distributaries in order to reach the sea forming a delta.

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