River environments Flashcards
Edexcel IGCSE Geography (4GE1)
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Hydrological cycle
continuous movement of water
Drainage basin
area drained by a river
Watershed
boundary between drainage basins
River source
where a river begins
River mouth
where river meets sea
Surface runoff
water flowing over land
infiltration
water entering the soil
Groundwater flow
water moving through rock
River discharge
volume of water flowing
River regime
seasonal discharge pattern
Hydraulic action
force of moving water
Abrasion
sediment scrapes river channel
Attrition
sediment collides and becomes smaller
Solution
soluble rock dissolves
Traction
large stones roll along bed
Saltation
small stones bounce along bed
Suspension
fine sediment carried in water
River deposition
sediment is dropped by river
Vertical erosion
downward erosion of riverbed
Lateral erosion
sideways erosion of riverbed
V-shaped valley
steep valley formed by erosion
Interlocking spurs
ridges around winding river
Waterfall formation
erosion creates steep river drop
Gorge formation
retreating waterfall leaves gorge
Meander formation
river bend caused by erosion/deposition
Oxbow lake
cut-off meander loop
Floodplain
flat land beside river
Natural levees
raised banks from deposition
Flood causes
heavy rain, runoff, snowmelt
Flood management
strategies reducing flood risk
Storm hydrograph
graph showing rainfall and discharge
Water pollution
harmull substances entering water
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