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- 1. Multiple Choice
Silt and Sand are picked up at velocities of 20cm/sec?
True
False
- 2. Multiple Choice
There is a negative relationship between velocity and particle size when looking at Fall Velocity
True
False
- 3. Multiple Choice
What happens when velocity is 10cm/sec
Boulders are transported
Pebbles are transported
Gravel is transported
Sand is transported
- 4. Multiple Choice
Which particles are entrained at 1000 cm/sec?
Just clay
Silt and sand only
All types of sediment
Only boulders
- 5. Multiple Choice
What is settling velocity of gravel
approximately 900 cm/sec
approximately 20 cm/sec
Approximately 1 cm/sec
Approximately 0.2 cm/sec
- 6. Multiple Choice
Once clay is entrained it will...
fall to the river bed when a bear pounces on the salmon
be deposited on the levees
not be deposited until it reaches the sea.
be deposited as the river slows to 0.5 cm/sec
- 7. Multiple Choice
Why is the entrainment velocity higher for particles like clay compared to silt and sand?
Clay and silt particles are larger therefore require more energy to entrain.
The mean settling velocity is slower than the critical erosion velocity
Clay particles form stronger bonds than sand particles
Sand is very sticky
- 8. Multiple Choice
What do you think Flocculation means?
In the sea clay and silt particles begin to stick together then fall to the seafloor
when a company goes public to sell shares on the stockmarket
the current tense of floccing
Feeding a flock of birds
- 9. Multiple Choice
This model is called what?
The Hjulstrom Curve
The Butler Model
The Burgess Model
The Bradshaw Model
- 10. Multiple Choice
Which is the smallest particle size classified on the Hjulstrom Curve
Silt
Sand
Gravel
Clay
- 11. Multiple Choice
Which is the largest particle size classified on the Hjulstrom Curve
Pebbles
Cobbles
Gravel
Boulders
- 12. Multiple Choice
What features represent the lower course of a river?
Deltas, estuaries and Rias
Steep Gradient, Rough bed and low average velocity
Interlocking spurs, v shaped valleys
Rapids and Waterfalls
- 13. Multiple Choice
Channel load...
increases downstream
decreases downstream
stays the same downstream
is most expensive when bought in duty free (don't fall for it)
- 14. Multiple Choice
Which is the correct order of increasing size?
Sand, silt, clay, boulders, cobbles, pebbles
pebbles, boulders...... where is Hjulstrom from anyway?
Clay, silt, sand, pebbles, cobbles, Boulders
Boulders, cobbles, pebbles, sand, silt, clay
- 15. Multiple Choice
Hjulstrom was..
Named Sven; a Geophysicists who moved from Gerrmany to Maine, USA in 1946
Named Filip; a Geographer who lived in Sweden
Named Frederic; a hydrologist from Norway with famous viking heritage.
Named Stollen; a student at Copehagen university who stumbled on some pebbles when studying rivers.
- 16. Multiple Choice
In Hydrology, Competence is..
How skilled you are at hydrology
how large the sand is that is being carried by the river
The diameter of the largest particle a river can carry
The total load that a river can carry.
- 17. Multiple Choice
Corrasion is another word for...
Attrition
Erosion
Cavitation
Abrasion
- 18. Multiple Choice
Name the type of sediment that requires the lowest velocity to be eroded.
Clay
Silt
Sand
Really small particles
- 19. Multiple Choice
Compared to the stream velocity between point X and point Y, the stream velocity between point Y and point Z is most likely
greater, since the slope of the land decreases
greater, since the slope of the land increases
less, since the slope of the land decreases
less, since the slope of the land decreases
- 20. Multiple Choice
The Hjulstrom Curve shows a simple positive correlation between sediment size and river velocity.
True
False
- 21. Multiple Choice
The three areas separated by highland divides are called
Tributaries
meanders
Drainage basins
floodplains
- 22. Multiple Choice
Which landform is produced at location E where the Mississippi River enters the Gulf of Mexico?
delta
drumlin
tributary
floodplain
- 23. Multiple Choice
At which two locations would the stream most likely be the deepest?
A and B
B and C
C and D
D and A
- 24. Multiple Choice
The greatest stream velocities are found closest to points
A and B
B and C
C and D
D and A
- 25. Multiple Choice
A river's current carries sediments into the ocean. Which sediment size will most likely be deposited in deeper water farthest from the shore?
pebbles
clay
silt
sand
- 26. Multiple Choice
What is deposition?
The movement of sediment
The breaking of sediment
The dropping of sediment
- 27. Multiple Choice
Small pieces of rock that have been weathered from a larger rock are known as...
sand
sediment
soil
- 28. Multiple Choice
The line that separates each drainage basin is called?
Tributaries
the source
A watershed
a floodplain
- 29. Poll
Poll: which statement is true for you?
I find the Hjulstrom Curve easy to understand
The Hjulstrom Curve makes sense, but I would need to see it to answer any questions on it.
I have found the Hjulstrom Curve difficult to understand
What is the Hjulstrom Curve?
- 30. Fill in the Blank
_______ is the process of the sheer force of water breaking sediment off the river bed
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