L4 meanders & ox bow lakes ap
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L4 meanders & ox bow lakes ap

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L4 meanders & ox bow lakes ap L4 meanders & ox bow lakes ap Presentation Transcript

  • Wordsearch!
  • Landform Features of a River Resulting from erosion and deposition … continued
  • 2. Features from erosion and deposition: Meanders and Oxbow Lakes • Video here View slide
  • • Meander on a map View slide
  • Water is pushed to the outer bend . This reduces friction with the bed and banks. So the river has more energy for transporting material which can erode the outside bank via abrasion. Meanders As the course of a river approaches its middle stages it flows over flatter land. Lateral erosion dominates as the river swings in large bends known as meanders. Meanders constantly change their shape and position.
  • RIVER CLIFF SLIP OFF SLOPE
  • Meander in 3D
  • Meander from above
  • 1 2 3 4 5 6 7 8 Meander Cross Section Copy out the diagram below and fill in the correct words next to the numbers.
  • Oxbow lakes
  • Ox bow lakes
  • Video here
  • 2. Features from erosion and deposition: Oxbow Lakes 1. Meander formed through erosion and deposition. A slip off slope develops on the inside of the meander (due to deposition) and a river cliff on the outside (due to undercutting) 2. During periods of flooding the meander neck is breached and the water takes the fastest route across the meander.
  • 2. Features from erosion and deposition: Oxbow Lakes 3. Erosion (Hydraulic action especially) continues and the neck is finally breached. Deposition begins in the old meander. 4. Deposition continues and eventually a lake is formed that is totally cut off from the river channel – an oxbow lake.