River Geomorphology and Sediment Yield

Rivers as networks; Sediment sources, transport and depositional forms; River channel form and monitoring techniques

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What is a drainage network?
Part of the land surface which is drained by a unitary river system
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What marks the perimeter of a drainage basin?
Watershed
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What is the most common form of drainage network?
Dendritic
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On steeper slopes, what form of drainage network is most common?
Parallel
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What form of drainage network is formed around a volcano?
Radial
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What hierarchical ordering method of stream channels is most widely/commonly used?
Horton-Strahler Method
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The Horton-Strahler method works by..
A and C
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Shallow, narrow, forested streams are of...... than bigger, more complex, wider streams
A lower order
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There is higher complexity/ habitat diversity/ biodiversity at...
The confluences
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What are the three key factors influencing sediment yield?
Precipitation, geology and relief
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What is the total sediment load?
Bedload + Washload + Suspended sediment
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What is washload?
Solute dissolved in water
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What is bedload?
Sediment rolled/saltated along bed
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What is suspended load?
Particles carried in suspension in water
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Why does clay require a high erosion velocity?
It sticks together
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T = 0.045 (density of sediment - density of water)x gravitational acceleration x sediment grain size, tells us what...
A and B
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Why is DuBoys equation more useful?
It relates movement to a given flow stage
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Sediment deposition: when the erodibility of bank particles is greater than the transportability of bank particles the channel is...
Braided
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When the erodibility of bank particles is less than the transportability of bank particles the channel is...
Braided
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A high ratio of bedload:total sediment is characteristic of...
Braided channel patterns
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Pools represent the..
Deepest points in the stream channel and the points of highest velocity
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Point bars are on the.... of the bend in a meandering channel
Inside
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In a meandering channel, the highest stream velocity and deepest part of the channel is on
The outside of the bend
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Meandering rivers shift their position by...
A, B and C
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Depositions of sediment in more meandering channels are...
Bars
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Other cards in this set

Card 2

Front

What marks the perimeter of a drainage basin?

Back

Watershed

Card 3

Front

What is the most common form of drainage network?

Back

Preview of the front of card 3

Card 4

Front

On steeper slopes, what form of drainage network is most common?

Back

Preview of the front of card 4

Card 5

Front

What form of drainage network is formed around a volcano?

Back

Preview of the front of card 5
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