39124452 geomorphology -_landforms_of_fluvial_erosion

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39124452 geomorphology -_landforms_of_fluvial_erosion

  1. 1. Geomorphology Landforms of Fluvial Erosion
  2. 2. 1. Waterfalls What part of the river course would you expect to find this feature? Identify 3 features of this waterfall? How does this feature move upstream? 2
  3. 3. 1. Waterfalls 3
  4. 4. 2. Rapids What type of river flow is characteristic of rapids? What process of river erosion has produced the rounded river stones and rocks? 4
  5. 5. 3. Potholes Describe the three processes of erosion responsible for the formation of potholes? What role do the narrow river gorges play in the process? 5
  6. 6. 4. MeandersIdentify the two types of slopes or banks of a meander 6
  7. 7. 4. Meanders Which bank of the meander does this photo show? How does this bank develop? What problems could such a feature cause in an urban area? How do town planners solve this problem? 7
  8. 8. Direction of Erosive Action Describe the direction of erosion in the upper course of a river that leads to the formation of waterfalls and rapids.  Describe the direction of erosion in the middle and lower courses of a river that leads to the formation of meanders. 8
  9. 9. 5. Oxbow Lakes/Meander Scars 9
  10. 10. Formation of Oxbow Lakes 10
  11. 11. Formation of Oxbow Lakes continued 11
  12. 12. Formation of Oxbow Lakes continued 12
  13. 13. Formation of Oxbow Lakes continued 13
  14. 14. Formation of Oxbow Lakes continued In meandering rivers, sediment is eroded on the outside of bends (undercut banks) and deposited on the inside of bends (slip off slope) Over time, this causes meander loops to migrate downstream If the movement of one meander loop overruns the next one downstream, then a meander cut-off is formed This causes the course of the channel to be shortened as the two meander loops join The abandoned meander loop is gradually isolated as sediment is deposited at each end by the water flow in the main channel. This process eventually leads to the 14 creation of an oxbow lake
  15. 15. This has been a Production COPYRIGHT WBHS 2005 15

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