Fluvial Processes 1 Flashcards

(30 cards)

1
Q

What are fluvial processes?

A

Processes performed by rivers that shape the landscape.

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2
Q

Name the three fluvial processes.

A

Erosion, transportation, deposition.

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3
Q

What is erosion?

A

The gradual destruction of land by flowing water.

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4
Q

What is transportation?

A

Movement of eroded material by a river.

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5
Q

What is deposition?

A

Dropping of transported material when the river loses energy.

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6
Q

What is a river profile?

A

A visual representation of a river’s shape.

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6
Q

What is a longitudinal profile?

A

Side view showing river gradient from source to mouth.

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7
Q

Where is the upper course found?

A

Near the river source.

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8
Q

Name the two types of river profiles.

A

Longitudinal profile and transverse profile.

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9
Q

What is a transverse profile?

A

Cross-section of a river valley from bank to bank.

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10
Q

Dominant process in the upper course?

A

Erosion (vertical erosion).

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11
Q

Flow type in upper course?

A

Turbulent.

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11
Q

Gradient in upper course?

A

Steep.

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12
Q

Water volume in upper course?

A

Low.

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13
Q

Gradient in middle course?

A

Gentle.

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14
Q

Dominant processes in middle course?

A

Both erosion and deposition.

15
Q

Where is the lower course found?

A

Near the river mouth.

16
Q

Lower Course Dominant process?

17
Q

Lower Course Flow type?

A

Laminar flow.

18
Q

Lower Course Water volume?

19
Q

What is a temporary base level?

A

Obstacles slowing erosion (waterfalls, rapids, dams).

20
Q

What is the permanent base level?

A

Sea level — lowest point erosion can reach.

21
Q

What are spurs?

A

Ridges of high land between river channels.

23
What are rapids?
Fast, turbulent water over uneven rock.
24
Conditions needed for rapids?
Resistant rock + uneven riverbed.
25
How does a waterfall form?
Soft rock erodes faster than hard rock, creating a drop.
26
What is the knickpoint (lip)?
Resistant rock over which water falls.
27
What is a plunge pool?
Deep basin at waterfall base.
28
Why do waterfalls retreat upstream?
Headward erosion.