River environments Flashcards

Edexcel IGCSE Geography (4GE1)

Hydrological cycle

continuous movement of water

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Terms in this set (32)

1

Hydrological cycle

continuous movement of water

2

Drainage basin

area drained by a river

3

Watershed

boundary between drainage basins

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River source

where a river begins

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River mouth

where river meets sea

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Surface runoff

water flowing over land

7

infiltration

water entering the soil

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Groundwater flow

water moving through rock

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River discharge

volume of water flowing

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River regime

seasonal discharge pattern

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Hydraulic action

force of moving water

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Abrasion

sediment scrapes river channel

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Attrition

sediment collides and becomes smaller

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Solution

soluble rock dissolves

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Traction

large stones roll along bed

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Saltation

small stones bounce along bed

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Suspension

fine sediment carried in water

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River deposition

sediment is dropped by river

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Vertical erosion

downward erosion of riverbed

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Lateral erosion

sideways erosion of riverbed

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V-shaped valley

steep valley formed by erosion

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Interlocking spurs

ridges around winding river

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Waterfall formation

erosion creates steep river drop

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Gorge formation

retreating waterfall leaves gorge

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Meander formation

river bend caused by erosion/deposition

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Oxbow lake

cut-off meander loop

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Floodplain

flat land beside river

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Natural levees

raised banks from deposition

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Flood causes

heavy rain, runoff, snowmelt

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Flood management

strategies reducing flood risk

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Storm hydrograph

graph showing rainfall and discharge

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Water pollution

harmull substances entering water

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