CHANGING Channel CHARACTERISTICS

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  • Created by: Sharon
  • Created on: 08-04-15 16:02
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  • Changing channel characteristics
    • CHANNEL CROSS PROFILE
      • large wetted perimeter = high friction
        • friction = energy loss = velocity slowed
        • rivers more efficient in middle and lower (smoother and larger)
          • lower course has slower water BUT less friction thus quicker
      • HYDRAULIC RADIUS = CROSS SECTIONAL AREA/WETTED PERIMETER
        • Higher HR means more efficient river.
    • IMPACT ON VELOCITY OR ROUGHNESS
      • Channel cross profile is view from one side to another.
        • upper course is narrow, uneven, as deposited boulders.
        • Middle course meanders - asymmetrical on bends but symmetrical in straight
        • Lower course widens and deepens however deposition = braided channels

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