F761 part of rivers

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  • Created by: charlie
  • Created on: 14-02-14 12:10

meanders

  • river needs SINUOSITY RATIO 1.5 or more :

= actual channel distance / straight line distance 

FORMATION

  • defelected water (esp. in upper course) produces INTERLOCKING SPURS
  • lower course produces PRONOUNCED BENDS due to gentler gradient + more lateral 

DIAGRAM OF MEANDER 

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levees

  • water floods over river bankful level + loses competence (ability to do stuff)
  • inceasing levees results in increased river bed height 

DIAGRAM 

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Braided channels

channel consiting of a network of smaller channels that are separated by small and often temporary islands called 'eyots' or 'braid bars' 

  • caused by DEPOSITION  
  • caused by fluctuation in DISCHARGE LEVELS, LOW VELOCITY 
  • transport load is LOOSE COARSE SEDIMENTS 

river flows through area of wider channel with little downward slope - DEPOSITION 

ways in which formed 

  • MONSOON 
  • SNOW MELT 
  • GLACIAL STREAMS 
  • LOSS OF COMPETENCE - loose +soft 

e.g YELLOW RIVER - CHINA 

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deltas

'formed when river slows and loses competence when it enters stationary body of water (lake, sea)' 

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