geographyalltheway.com - IB Geography - The Bradshaw Model

50,588 views
54,336 views

Published on

http://www.geographyalltheway.com/in/ib-freshwater/discharge.htm

0 Comments
6 Likes
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
50,588
On SlideShare
0
From Embeds
0
Number of Embeds
31
Actions
Shares
0
Downloads
0
Comments
0
Likes
6
Embeds 0
No embeds

No notes for slide

geographyalltheway.com - IB Geography - The Bradshaw Model

  1. 1. TheBradshawModel
  2. 2. Upstream Downstream Discharge Occupied channel width Channel depth Average velocity Load quantityLoad particle sizeChannel bed roughnessSlope angle (gradient)
  3. 3. DischargeUpstream Downstream Discharge Occupied channel width Channel depth Average velocity Load quantityLoad particle sizeChannel bed roughnessSlope angle (gradient)
  4. 4. DischargeUpstream 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 quantityLoad particle sizeChannel bed roughnessSlope angle (gradient)
  5. 5. Occupied Channel WidthUpstream Downstream Discharge Occupied channel width Channel depth Average velocity Load quantityLoad particle sizeChannel bed roughnessSlope angle (gradient)
  6. 6. Occupied Channel WidthUpstream Downstream Distance across the actual Discharge channel, measured at the water surface Occupied channel width Channel depth Average velocity Load quantityLoad particle sizeChannel bed roughnessSlope angle (gradient)
  7. 7. Occupied Channel WidthUpstream 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 quantityLoad particle sizeChannel bed roughnessSlope angle (gradient)
  8. 8. Channel DepthUpstream Downstream Discharge Occupied channel width Channel depth Average velocity Load quantityLoad particle sizeChannel bed roughnessSlope angle (gradient)
  9. 9. Channel DepthUpstream Downstream The height from the water Discharge surface to the channel bed Occupied channel width Channel depth Average velocity Load quantityLoad particle sizeChannel bed roughnessSlope angle (gradient)
  10. 10. Channel DepthUpstream 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 quantityLoad particle sizeChannel bed roughnessSlope angle (gradient)
  11. 11. Channel DepthUpstream 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 quantityLoad particle sizeChannel bed roughnessSlope angle (gradient)
  12. 12. Average VelocityUpstream Downstream Discharge Occupied channel width Channel depth Average velocity Load quantityLoad particle sizeChannel bed roughnessSlope angle (gradient)
  13. 13. Average VelocityUpstream Downstream Steady increase downstream Discharge Occupied channel width Channel depth Average velocity Load quantityLoad particle sizeChannel bed roughnessSlope angle (gradient)
  14. 14. Average VelocityUpstream Downstream Steady increase downstream Discharge How can it be so if the Occupied channel width gradient is decreasing? Channel depth Average velocity Load quantityLoad particle sizeChannel bed roughnessSlope angle (gradient)
  15. 15. Average VelocityUpstream 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 banksLoad particle sizeChannel bed roughnessSlope angle (gradient)
  16. 16. Average VelocityUpstream 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 banksLoad particle sizeChannel bed roughness Shown by higher hydraulic radius and lower channel bedSlope angle (gradient) roughness
  17. 17. Average VelocityUpstream 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 banksLoad particle sizeChannel bed roughness Shown by higher hydraulic radius and lower channel bedSlope angle (gradient) roughness
  18. 18. Load QuantityUpstream Downstream Discharge Occupied channel width Channel depth Average velocity Load quantityLoad particle sizeChannel bed roughnessSlope angle (gradient)
  19. 19. Load QuantityUpstream Downstream Total load of all sizes Discharge Occupied channel width Channel depth Average velocity Load quantityLoad particle sizeChannel bed roughnessSlope angle (gradient)
  20. 20. Load QuantityUpstream Downstream Total load of all sizes Discharge Increases with discharge and Occupied channel width velocity Channel depth Average velocity Load quantityLoad particle sizeChannel bed roughnessSlope angle (gradient)
  21. 21. Load QuantityUpstream Downstream Total load of all sizes Discharge Increases with discharge and Occupied channel width velocity Channel depth Average velocity Load quantityLoad particle sizeChannel bed roughnessSlope angle (gradient)
  22. 22. Load Particle SizeUpstream Downstream Discharge Occupied channel width Channel depth Average velocity Load quantityLoad particle sizeChannel bed roughnessSlope angle (gradient)
  23. 23. Load Particle SizeUpstream Downstream Decreases considerably Discharge downstream Occupied channel width Channel depth Average velocity Load quantityLoad particle sizeChannel bed roughnessSlope angle (gradient)
  24. 24. Load Particle SizeUpstream Downstream Decreases considerably Discharge downstream Occupied channel width Angular pebbles become more rounded Channel depth Average velocity Load quantityLoad particle sizeChannel bed roughnessSlope angle (gradient)
  25. 25. Load Particle SizeUpstream Downstream Decreases considerably Discharge downstream Occupied channel width Angular pebbles become more rounded Channel depth Average velocity Erosional process of attrition Load quantityLoad particle sizeChannel bed roughnessSlope angle (gradient)
  26. 26. Load Particle SizeUpstream Downstream Decreases considerably Discharge downstream Occupied channel width Angular pebbles become more rounded Channel depth Average velocity Erosional process of attrition Load quantityLoad particle sizeChannel bed roughnessSlope angle (gradient)
  27. 27. Channel Bed RoughnessUpstream Downstream Discharge Occupied channel width Channel depth Average velocity Load quantityLoad particle sizeChannel bed roughnessSlope angle (gradient)
  28. 28. Channel Bed RoughnessUpstream Downstream Decreases because of fewer Discharge stones etc, smaller load particle size etc. Occupied channel width Channel depth Average velocity Load quantityLoad particle sizeChannel bed roughnessSlope angle (gradient)
  29. 29. Channel Bed RoughnessUpstream Downstream Decreases because of fewer Discharge stones etc, smaller load particle size etc. Occupied channel width Channel depth Average velocity Load quantityLoad particle sizeChannel bed roughnessSlope angle (gradient)
  30. 30. Slope AngleUpstream Downstream Discharge Occupied channel width Channel depth Average velocity Load quantityLoad particle sizeChannel bed roughnessSlope angle (gradient)
  31. 31. Slope AngleUpstream Downstream Decreases Discharge Occupied channel width Channel depth Average velocity Load quantityLoad particle sizeChannel bed roughnessSlope angle (gradient)

×