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Works of river<br />
Previous lesson<br />River erosion<br />
River erosion<br />The process of wearing away of the rocks on the bed and banks of the river by the energy of the river f...
<ul><li>River erosion also happens by the load carries on the river channel itself.
The erosion rate varies with different volume and velocity.</li></li></ul><li>Processes involved in river erosion.<br />Co...
Types of river erosion<br />Vertical erosion<br />Headward erosion<br />Lateral erosion<br />
Vertical erosion<br />River removes material from river bed<br />By corrosion/abrasion process<br />Result:Deepen a river ...
Headward erosion<br />River cut its source<br />Results: lengthening of the river in the upstream direction<br />
Lateral erosion<br />The wearing away of river bank<br />By corrosion and solution process.<br />Result: widen the river a...
River transportation<br />
Objectives:<br /><ul><li>Understand river transportation
Understand processes of river transportation (suspension, saltation, traction and solution)</li></li></ul><li>
River transportation<br />When a river transport its load downstream.<br />The loads are the eroded materials<br />The vol...
4 ways of river transportation<br />Traction<br />Saltation<br />Suspension<br />
Traction<br />Material: Big rocks<br />How? Rolling and Dragged on the river bed<br />Why? They are heavy<br />
saltation<br />Material: small stones<br />How? Hopping and Bouncing on the river bed<br />Why? Caused by swirling water<b...
suspension<br />Material: fine (very small) rocks.<br />How? Carried along the river surface<br />Why? They are very light...
Solution<br />Material: dissolved materials<br />How? Carried along the water<br />Cant see by naked eyes<br />
Mnemonics:<br />Teacher       (Traction)<br />SAya           (SAltation)<br />SUka          (SUspension)<br />SOtong      ...
Summary:<br />Rivertrasportation<br />Definition:<br />4 ways of river transportation:<br />
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River transportation processes

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Transcript of "River transportation processes"

  1. 1. Works of river<br />
  2. 2. Previous lesson<br />River erosion<br />
  3. 3.
  4. 4. River erosion<br />The process of wearing away of the rocks on the bed and banks of the river by the energy of the river flow.<br />
  5. 5. <ul><li>River erosion also happens by the load carries on the river channel itself.
  6. 6. The erosion rate varies with different volume and velocity.</li></li></ul><li>Processes involved in river erosion.<br />Corrasion (abrasion)<br />Attrition<br />Solution (corrosion)<br />Hydraulic action<br />
  7. 7. Types of river erosion<br />Vertical erosion<br />Headward erosion<br />Lateral erosion<br />
  8. 8. Vertical erosion<br />River removes material from river bed<br />By corrosion/abrasion process<br />Result:Deepen a river channel and create narrow V-shaped valley.<br />
  9. 9. Headward erosion<br />River cut its source<br />Results: lengthening of the river in the upstream direction<br />
  10. 10. Lateral erosion<br />The wearing away of river bank<br />By corrosion and solution process.<br />Result: widen the river and form a U shaped valley.<br />
  11. 11. River transportation<br />
  12. 12. Objectives:<br /><ul><li>Understand river transportation
  13. 13. Understand processes of river transportation (suspension, saltation, traction and solution)</li></li></ul><li>
  14. 14. River transportation<br />When a river transport its load downstream.<br />The loads are the eroded materials<br />The volume and velocity of the river affects the river transportation rate<br />
  15. 15. 4 ways of river transportation<br />Traction<br />Saltation<br />Suspension<br />
  16. 16. Traction<br />Material: Big rocks<br />How? Rolling and Dragged on the river bed<br />Why? They are heavy<br />
  17. 17. saltation<br />Material: small stones<br />How? Hopping and Bouncing on the river bed<br />Why? Caused by swirling water<br />
  18. 18. suspension<br />Material: fine (very small) rocks.<br />How? Carried along the river surface<br />Why? They are very light<br />
  19. 19. Solution<br />Material: dissolved materials<br />How? Carried along the water<br />Cant see by naked eyes<br />
  20. 20. Mnemonics:<br />Teacher (Traction)<br />SAya (SAltation)<br />SUka (SUspension)<br />SOtong (SOlution)<br />
  21. 21. Summary:<br />Rivertrasportation<br />Definition:<br />4 ways of river transportation:<br />
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