Rivers
- Created by: whitestartcity
- Created on: 19-04-15 14:48
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- Rivers
- Rivers system
- Upper Course
- Gradient= steep
- Discharge = small
- Depth=Shallow
- Channel Shapes= narrow, steep sides
- Velocity= Quiet fast
- Valley Shape= Steep sides
- Features = waterfalls, interlocking spurs
- Middle Course
- Gradient= less steep
- Discharge= large
- Depth=deeper
- Channel shape= Flat, floor, gently sloping sides
- Velocity=fast
- Valley shape = flat with steep sides
- Features=meanders, floodplains
- Lower course
- gradient =shallow gradient
- Discharge= very large
- depth= deep
- channel shape= flat floor, gently sloping sides
- Velocity= very fast
- Valley features= flat with gently sloping sides
- Feature = meanders, floodplains, levees, ox-bow lakes
- Upper Course
- Weathering
- Freeze-thaw
- Water accumulates in a crack in the rock, freezes and expands
- Rainwater enters the crack in a rock. If it freezes it expands and exerts pressure on the rocks and the rocks can eventually break into smaller pieces
- Water accumulates in a crack in the rock, freezes and expands
- Biological
- tree roots can penetrates cracks in the rocks and split them apart
- Chemical
- Rainwater is slightly acidic and can dissolve some rock, especially limestone and chalk
- Freeze-thaw
- Mass movement
- soil creep
- Partials of soil slowly moves down the sides of valley under the influence of gravity
- Slumping
- Valley sides are eroded by the river making the sides steeper and increasing the downward movement of materials. Heavy rainfall can trigger this movement
- soil creep
- Rivers system
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