fluvial_processes.ppt all knowledge of fluviel in this ppt so read it it is very use ful

By Nishant

1. Fluvial Systems
GPH 111

2. What are Fluvial Processes?
Collection of surface water into organized sequence
of channelized forms whereby sediment is
transported from the continents to ocean basins.

3. Fluvial Processes within
Geomorphology
Sierra Estrella Mountains
and the Gila River

4. Fluvial Deposition-Mountains
weather and erode, rivers then
transport the debris to the sea.
The Amazon
River Delta
Brazil, South
America

5. The Longitudinal Profile!
Maintains an “Equilibrium Gradient”
Riversonly want the energyto transport
their water and supplied sediment to
ocean basins, and nothingmore!

6. Key Concepts!
Discharge-Amount of water flowing in a river
Slope–The inclination of the river channel
Sediment Load–Sediment transported
Vegetation–Along and within the channel
Riversonly want the energyto transport
their water and supplied sediment to
ocean basins, and nothingmore!

7. How do rivers adjust over time?
Similar to an airlinethat tries to fill all
seats for their flights, no MORE or LESS.
Equilibrium-Just enough
fuel to carry planes full of
passengers to their
destinations and nothing
more –Happy Company!
Too Full!–Upset
passengers, not
enoughfuel or
flights to transport
customers
Too Empty!–Upset
passengers, toomuch
fuel or toomany
flights to transport
customers.

8. How do rivers adjust over time?

9. Channel Aggradation
Massive sediment
input leads to
extreme
aggradation.
“Steepens channel
to increase
available energy”

10. Channel Incision
Commonly takes place through knickpoint
retreat!!
Let’s go outside!!!
“Lowers available
energy”

11. Channel Incision

12. Channel Widening and
Narrowing
The role of width
to depth ratios in
fluvial energy
Higher width to
depth ratios the
more energy loss
to friction

13. Channel Widening
Increase width to depth ratios…
“Decreases available energy”

14. Channel
Narrowing
Decrease width
to depth ratios…
“Increases available
energy”

15. Lengthening and Shortening -
Channel Meanders
Areas of maximum
velocity causes
erosion generating
meander bends
that move in a
downstream
direction

16. Lengthening and Shortening -
Channel Meanders

17. Lengthening and Shortening -
Channel Meanders
Famous Oxbow Lake in the Making!

18. Lengthening and Shortening -
Channel Meanders
Channel develops moremeanders –“Lowers available energy”
Channel develops lessmeanders –“Increases available energy”

19. Key Concepts!
Discharge-Amount of water flowing in a river
Slope–The inclination of the river channel
Sediment Load–Sediment transported
Vegetation–Along and within the channel
Riversonly want the energyto transport
their water and supplied sediment to
ocean basins, and nothingmore!

20. How do rivers adjust over time?
Let’s do the
Lab!!!

21. What do rivers do?

22. Things to Know:
Hortanianversus Saturationoverland flow
Stream Order, drainage basins, drainage
divide
Types of fluvial sediment transport
What is a river’s equilibrium gradient?
What alters a river’s equilibrium gradient?
How can river’s respond to channel
change?
Help: Chapter FS