Rivers

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Name two processes of river erosion and explain
Abrasion: rocks carried by the river wear down the river bed. Solution: soluble particles are dissolved into the river
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Name two processes of river transport and explain
Traction: heaviest particles are rolled along the river bed Saltation: sand-sized particles may be bounced along the rive bed in a leap-frog motion
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What landforms can you find in the upper course of a river?
V’ shaped valleys, gorges, waterfalls and interlocking spurs
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What landforms can you find in the middle course of a river?
Meanders and Ox-bow lakes can be found.
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What landforms can you find in the lower course of a river?
Mudflats, Deltas, Floodplains and Estuaries can be found in the lower course.
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Explain the formation of a waterfall.
Water flows over a layer of hard rock onto a layer of soft rock. This then begins to erode by hydraulic action. An overhang begins to occur and the hard rock eventually collapses due to gravity. Abrasion can now erode more and repeat the process
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What are the physical causes of flooding?
Rainfall, Antecedent Rainfall (saturated ground), Soli/Rock type, Relief, Weather
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What are the human causes of flooding?
Deforestation, Soil Erosion, Farming, Building
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What is soft engineering?
Techniques that are ecologically sensitive and provide options for flooding
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What is hard engineering?
Direct human impact on the river to manage flooding
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What is a dam?
Physical structure that holds back water along the course of a river, which can release water in a controlled way
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Name two ways in which rivers can be managed.
Damn construction, River engineering, Afforestation, Managed flooding
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Other cards in this set

Card 2

Front

Name two processes of river transport and explain

Back

Traction: heaviest particles are rolled along the river bed Saltation: sand-sized particles may be bounced along the rive bed in a leap-frog motion

Card 3

Front

What landforms can you find in the upper course of a river?

Back

Preview of the front of card 3

Card 4

Front

What landforms can you find in the middle course of a river?

Back

Preview of the front of card 4

Card 5

Front

What landforms can you find in the lower course of a river?

Back

Preview of the front of card 5
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