river transportation processes

1. Works of river

2. Previous lesson River erosion

4. River erosion The process of wearing away of the rocks on the bed and banks of the river by the energy of the river flow.

7. Types of river erosion Vertical erosion Headward erosion Lateral erosion

8. Vertical erosion River removes material from river bed By corrosion/abrasion process Result:Deepen a river channel and create narrow V-shaped valley.

9. Headward erosion River cut its source Results: lengthening of the river in the upstream direction

10. Lateral erosion The wearing away of river bank By corrosion and solution process. Result: widen the river and form a U shaped valley.

11. River transportation

14. River transportation When a river transport its load downstream. The loads are the eroded materials The volume and velocity of the river affects the river transportation rate

15. 4 ways of river transportation Traction Saltation Suspension

16. Traction Material: Big rocks How? Rolling and Dragged on the river bed Why? They are heavy

17. saltation Material: small stones How? Hopping and Bouncing on the river bed Why? Caused by swirling water

18. suspension Material: fine (very small) rocks. How? Carried along the river surface Why? They are very light

19. Solution Material: dissolved materials How? Carried along the water Cant see by naked eyes

20. Mnemonics: Teacher (Traction) SAya (SAltation) SUka (SUspension) SOtong (SOlution)

21. Summary: Rivertrasportation Definition: 4 ways of river transportation: