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Bradshaw's model

Explanation of Bradshaw's model

QuestionAnswer
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