CHANGING Channel CHARACTERISTICS
- 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.
- large wetted perimeter = high friction
- 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
- Channel cross profile is view from one side to another.
- CHANNEL CROSS PROFILE
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