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River transportation processes
River transportation processes
River transportation processes
River transportation processes
River transportation processes
River transportation processes
River transportation processes
River transportation processes
River transportation processes
River transportation processes
River transportation processes
River transportation processes
River transportation processes
River transportation processes
River transportation processes
River transportation processes
River transportation processes
River transportation processes
River transportation processes
River transportation processes
River transportation processes
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River transportation processes

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river transportation processes

river transportation processes

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  • 1. Works of river<br />
  • 2. Previous lesson<br />River erosion<br />
  • 3.
  • 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. <ul><li>River erosion also happens by the load carries on the river channel itself.
  • 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. Types of river erosion<br />Vertical erosion<br />Headward erosion<br />Lateral erosion<br />
  • 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. Headward erosion<br />River cut its source<br />Results: lengthening of the river in the upstream direction<br />
  • 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. River transportation<br />
  • 12. Objectives:<br /><ul><li>Understand river transportation
  • 13. Understand processes of river transportation (suspension, saltation, traction and solution)</li></li></ul><li>
  • 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. 4 ways of river transportation<br />Traction<br />Saltation<br />Suspension<br />
  • 16. Traction<br />Material: Big rocks<br />How? Rolling and Dragged on the river bed<br />Why? They are heavy<br />
  • 17. saltation<br />Material: small stones<br />How? Hopping and Bouncing on the river bed<br />Why? Caused by swirling water<br />
  • 18. suspension<br />Material: fine (very small) rocks.<br />How? Carried along the river surface<br />Why? They are very light<br />
  • 19. Solution<br />Material: dissolved materials<br />How? Carried along the water<br />Cant see by naked eyes<br />
  • 20. Mnemonics:<br />Teacher (Traction)<br />SAya (SAltation)<br />SUka (SUspension)<br />SOtong (SOlution)<br />
  • 21. Summary:<br />Rivertrasportation<br />Definition:<br />4 ways of river transportation:<br />

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