2. Outline 1. Motivation 2. River Morphodynamic
3. Sediment Transport in River Bends
4. Application Example

3. 1. Motivation
Kurabayashi (2003)

4. 1. Motivation
Kurabayashi (2003)

5. 1. Motivation
Internet

6. 1. Motivation
Internet

7. 1. Motivation
Patt (1998)

8. 1. Motivation
Internet

9. 1. Motivation
Internet

10. 2. River Morphodynamic
Patt (1998)

11. 2. River Morphodynamic Increase of movable Sediments Upper Reaches
Sand
Gravel
Boulder
Silt
fine Sand
Upper Reaches
Middle Reaches
Low Reaches
Decrease of Valley Slope
Decrease of Sediment Size
Huette (1994), modified

12. 2. River Morphodynamic B C A M R A M R
A.M. daSilva (2001)

13. 2. River Morphodynamic
Ackers&Charlton (1970)

14. Meander Characteristics
2. River Morphodynamic
Meander Characteristics
Internet

15. 2. River Morphodynamic
daSilva (2001)

16. Spiral Motion of Flow in a Channel Bend
3. Sediment Transport in River Bends
Spiral Motion of Flow in a Channel Bend
Spiral motion

17. Bed Load Particle on Transversal Slopes
3. Sediment Transport in River Bends
Bed Load Particle on Transversal Slopes
....Kikkawa et al. (1976)
....Engelund (1981)
Spiral motion

18. Reduced Stability for Particles on Side Slope
3. Sediment Transport in River Bends
Reduced Stability for Particles on Side Slope
Bed
Bank
FLow
Wsina
Wcosa a d RD Fb
Brooks (1963)

19. 4. Application Example Experimental set up by Kawai & Julien (1996) 20
450 50
160 a
all measures in [cm]
4 l/s
Discharge
50 mm
Mean flow depth
1/300
Mean bed slope
l/s
Sediment feed
0.6 mm
d50
3.7 mm/s
0.77 4 3
Measured shear velocity
Froude number
Width/depth
Raduis/width

20. Contour plot of the bed changes
4. Application Example
experiment
bed changes in [m]
simulation
bed changes in [m]
Contour plot of the bed changes

21. 4. Application Example
Direction of a bed load particle after Kikkawa et al. (1976)
experiment
bed changes in [m]
simulation
bed changes in [m]
Contour plot of the bed changes

22. 4. Application Example
Direction of a bed load particle after Engelund (1981)
experiment
bed changes in [m]
simulation
bed changes in [m]
Contour plot of the bed changes

23. Bed changes over time [m]
4. Application Example
Bed changes over time [m]

24. 4. Application Example
Friedkin (1945)

25. 4. Application Example
Friedkin (1945)

26. The Application – Friedkin Experiment (1945)
4. Application Example
The Application – Friedkin Experiment (1945)
rigid lid approach
hwetting/drying = 0.003m