FACTORS
- River velocity
- River volume
SPEED OF RIVER (velocity)
 | Gradient of river
 | the steeper the gradient, the faster is the flow |
|
| Roughness of the channel
| the rougher the channel, the slower is the flow, because the water has to overcome the
friction of the river bed and banks |
|
| Shape of channel
| Larger wetted perimeter (banks and bed in contact with water), the river has to overcome
more friction and is slowed down. |
|
VOLUME OF RIVER
The volume of river depends on :
- Size of drainage basin
| the larger the draiinage basin, the more tributaries there are and the greater is the
volume of water |
Presence of Vegetation
| Vegetation intercepts the rain and enables the rain water to infiltrate into the ground.
This reduces surface run-off and so less water flows immediately into the river. |
Permeability of rocks
| If the underlying rocks in the drainage basin are permeable, rain water infiltrate into
the ground quickly and there will be little surface run-off flowing into the river. |
Climate
| If there is low rainfall and high precipitation, the rivermay have a low volume of
flow or even dry up. (Vice-versa) |
EROSIONAL PROCESSES: -
| Corrasion (abrasion) |
| Attrition |
| Solution (corrosion) |
| Hydraulic action |
|
A
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