Uploaded byRichard Allaway
geographyalltheway.com - IB Geography - The Bradshaw Model
The document describes how characteristics of a river channel change from upstream to downstream. It explains that discharge, occupied channel width, channel depth, and average velocity all increase downstream as the drainage basin and input to the river increases. Channel depth and width increase to accommodate higher discharges. Average velocity increases downstream because the river becomes more efficient with less contact with its bed and banks, shown by a higher hydraulic radius and lower channel bed roughness.
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geographyalltheway.com - IB Geography - The Bradshaw Model
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- 2. Upstream Downstream Discharge Occupied channel width Channel depth Average velocity Load quantity Load particle size Channel bed roughness Slope angle (gradient)
- 5. Discharge Upstream Downstream Discharge Occupied channel width Channel depth Average velocity Load quantity Load particle size Channel bed roughness Slope angle (gradient)
- 6. Discharge Upstream Downstream Increases due to the input Discharge from a greater amount of the drainage basin above the Occupied channel width point of measurement Channel depth Average velocity Load quantity Load particle size Channel bed roughness Slope angle (gradient)
- 7. Occupied Channel Width Upstream Downstream Discharge Occupied channel width Channel depth Average velocity Load quantity Load particle size Channel bed roughness Slope angle (gradient)
- 8. Occupied Channel Width Upstream Downstream Distance across the actual Discharge channel, measured at the water surface Occupied channel width Channel depth Average velocity Load quantity Load particle size Channel bed roughness Slope angle (gradient)
- 9. Occupied Channel Width Upstream Downstream Distance across the actual Discharge channel, measured at the water surface Occupied channel width Increases due to increase in Channel depth discharge, input from Average velocity tributaries etc. Load quantity Load particle size Channel bed roughness Slope angle (gradient)
- 10. Channel Depth Upstream Downstream Discharge Occupied channel width Channel depth Average velocity Load quantity Load particle size Channel bed roughness Slope angle (gradient)
- 11. Channel Depth Upstream Downstream The height from the water Discharge surface to the channel bed Occupied channel width Channel depth Average velocity Load quantity Load particle size Channel bed roughness Slope angle (gradient)
- 12. Channel Depth Upstream Downstream The height from the water Discharge surface to the channel bed Occupied channel width Increase downstream as does the discharge of the river Channel depth Average velocity Load quantity Load particle size Channel bed roughness Slope angle (gradient)
- 13. Channel Depth Upstream Downstream The height from the water Discharge surface to the channel bed Occupied channel width Increase downstream as does the discharge of the river Channel depth Average velocity Load quantity Load particle size Channel bed roughness Slope angle (gradient)
- 14. Average Velocity Upstream Downstream Discharge Occupied channel width Channel depth Average velocity Load quantity Load particle size Channel bed roughness Slope angle (gradient)
- 15. Average Velocity Upstream Downstream Steady increase downstream Discharge Occupied channel width Channel depth Average velocity Load quantity Load particle size Channel bed roughness Slope angle (gradient)
- 16. Average Velocity Upstream Downstream Steady increase downstream Discharge How can it be so if the Occupied channel width gradient is decreasing? Channel depth Average velocity Load quantity Load particle size Channel bed roughness Slope angle (gradient)
- 17. Average Velocity Upstream Downstream Steady increase downstream Discharge How can it be so if the Occupied channel width gradient is decreasing? Channel depth Downstream the river Average velocity becomes more efficient with Load quantity proportionally less contact with its bed and banks Load particle size Channel bed roughness Slope angle (gradient)
- 18. Average Velocity Upstream Downstream Steady increase downstream Discharge How can it be so if the Occupied channel width gradient is decreasing? Channel depth Downstream the river Average velocity becomes more efficient with Load quantity proportionally less contact with its bed and banks Load particle size Channel bed roughness Shown by higher hydraulic radius and lower channel bed Slope angle (gradient) roughness
- 19. Average Velocity Upstream Downstream Steady increase downstream Discharge How can it be so if the Occupied channel width gradient is decreasing? Channel depth Downstream the river Average velocity becomes more efficient with Load quantity proportionally less contact with its bed and banks Load particle size Channel bed roughness Shown by higher hydraulic radius and lower channel bed Slope angle (gradient) roughness
- 20. Load Quantity Upstream Downstream Discharge Occupied channel width Channel depth Average velocity Load quantity Load particle size Channel bed roughness Slope angle (gradient)
- 21. Load Quantity Upstream Downstream Total load of all sizes Discharge Occupied channel width Channel depth Average velocity Load quantity Load particle size Channel bed roughness Slope angle (gradient)
- 22. Load Quantity Upstream Downstream Total load of all sizes Discharge Increases with discharge and Occupied channel width velocity Channel depth Average velocity Load quantity Load particle size Channel bed roughness Slope angle (gradient)
- 23. Load Quantity Upstream Downstream Total load of all sizes Discharge Increases with discharge and Occupied channel width velocity Channel depth Average velocity Load quantity Load particle size Channel bed roughness Slope angle (gradient)
- 24. Load Particle Size Upstream Downstream Discharge Occupied channel width Channel depth Average velocity Load quantity Load particle size Channel bed roughness Slope angle (gradient)
- 25. Load Particle Size Upstream Downstream Decreases considerably Discharge downstream Occupied channel width Channel depth Average velocity Load quantity Load particle size Channel bed roughness Slope angle (gradient)
- 26. Load Particle Size Upstream Downstream Decreases considerably Discharge downstream Occupied channel width Angular pebbles become more rounded Channel depth Average velocity Load quantity Load particle size Channel bed roughness Slope angle (gradient)
- 27. Load Particle Size Upstream Downstream Decreases considerably Discharge downstream Occupied channel width Angular pebbles become more rounded Channel depth Average velocity Erosional process of attrition Load quantity Load particle size Channel bed roughness Slope angle (gradient)
- 28. Load Particle Size Upstream Downstream Decreases considerably Discharge downstream Occupied channel width Angular pebbles become more rounded Channel depth Average velocity Erosional process of attrition Load quantity Load particle size Channel bed roughness Slope angle (gradient)
- 29. Channel Bed Roughness Upstream Downstream Discharge Occupied channel width Channel depth Average velocity Load quantity Load particle size Channel bed roughness Slope angle (gradient)
- 30. Channel Bed Roughness Upstream Downstream Decreases because of fewer Discharge stones etc, smaller load particle size etc. Occupied channel width Channel depth Average velocity Load quantity Load particle size Channel bed roughness Slope angle (gradient)
- 31. Channel Bed Roughness Upstream Downstream Decreases because of fewer Discharge stones etc, smaller load particle size etc. Occupied channel width Channel depth Average velocity Load quantity Load particle size Channel bed roughness Slope angle (gradient)
- 32. Slope Angle Upstream Downstream Discharge Occupied channel width Channel depth Average velocity Load quantity Load particle size Channel bed roughness Slope angle (gradient)
- 33. Slope Angle Upstream Downstream Decreases Discharge Occupied channel width Channel depth Average velocity Load quantity Load particle size Channel bed roughness Slope angle (gradient)