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Discharge increases
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Occupied channel width increases
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Bradshaw's model
Explanation of Bradshaw's model
| Question | Answer |
|---|---|
| Discharge increases | As more and more tributaries join the stream, they each bring more water. The catchment area is therefore bigger as distance downstream increases |
| Occupied channel width increases | As tributaries join, discharge is greater. More water occupies the channel so width will increase. The water also has more velocity as its flow is less turbulent, so more hydraulic action occurs |
| Channel depth increases | As tributaries join, discharge is greater. More water occupies the channel so depth will increase. The water also has more velocity as its flow is less turbulent, so more hydraulic action occurs |
| Average velocity increases | The river becomes wider with a smoother riverbed and banks, which increases laminar flow, and makes it more efficient |
| Load quantity increases | As the river travels downstream, it picks up more sediment to carry, and erodes more bed and bank rock |
| Load particle size decreases downstream | The process of attrition makes sediment size smaller |
| Channel bed roughness decreases downstream | Abrasion rubs and scours the bed and banks of the river by sedimentary material, smoothing the sides |
| Slope angle decreases downstream | As more water joins from tributaries, lateral arosive power increases, so less downcutting occurs |
| The wetted perimeter increases | Channel width and depth increase |
| Turbulent flow decreases | The river becomes wider with a smoother riverbed and banks, making flow more laminar |
Created by:
Rayrayy
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