1. Study of Stream Channel

2. The variations of channel geometry Group 4

3. Discussion Topic 1. Summarize and describe the main findings the variations of channel geometry.

4. Upper course Middle course Lower course River (Area A1&2)(Area B3&4)(Area C5&6)

5. Channel geometry e.g. the width, depth, length, gradient and wetted perimeter Upper course Middle course Lower course

6. Area B4 Area C5 Area A2

7. Compare of the channel Geometry Area A2Area B4Area C5 Average depth(cm) 17.113.34712.45 Width(cm)3867602060 Wetted perimeter (m) 8.27.620.6 Average gradient 4 degrees 45 min 0 degrees 50 min 3 degrees 10 min

8. Upper Course (Area A2)

9. Middle course Area B4

10. Lower course (Area C5)

11. Upper course Width: less lateral erosion narrow Depth: serious vertical erosion deep Length: straight river course short Gradient: serious erosion steep slope Wetted perimeter: narrow Factors affecting geometry

12. Middle course Width: more lateral erosion than upper course Depth: less vertical erosion than the upper course Length: meanders exist longer than upper course Gradient: less erosion less steep slope Wetted perimeter: wide

13. Lower course Width: serious lateral erosion wide Depth: less vertical erosion and deposition shallow Length: ** more meanders exist longest Gradient : deposition gentle slope Wetted perimeter :very wide

14. Description of channel geometry Conclusion Description of channel geometry gradientVelocityDepth / Width / Length ASteepRapidDeep (vertical erosion) / Narrow / Short BLess steep SlowMedium / Medium / Medium CGentleRapidShallow / Wide / Long

15. The End~~ Thank you!