L4 meanders & ox bow lakes ap
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Transcript of L4 meanders & ox bow lakes ap
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Wordsearch!
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Landform Features of a River
Resulting from erosion and deposition … continued
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2. Features from erosion and deposition: Meanders and Oxbow Lakes
• Video here
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• Meander on a map
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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.
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RIVER CLIFF
SLIP OFF SLOPE
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Meander in 3D
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Meander from above
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1
2
3
4 5
678
Meander Cross Section Copy out the diagram below and fill in the correct words next to the numbers.
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Oxbow lakes
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Ox bow lakes
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Video here
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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.
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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.