River landscapes (Edexcel GCSE Geography A): Flashcards
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14 cards from this deck
Main process forming lower course landforms
Main process forming lower course landforms
Depositional processes
Three landforms in lower river course
Three landforms in lower river course
Floodplains, levées, and point bars
Floodplain definition
Floodplain definition
Broad, flat area beside river, covered during floods
Reason floodplains are fertile
Reason floodplains are fertile
Nutrient-rich sediment deposited during floods
Term for river sediment in lower course
Term for river sediment in lower course
Alluvium
What happens to river velocity during flooding?
What happens to river velocity during flooding?
Drops significantly
Levées definition
Levées definition
Natural raised embankments alongside rivers
Sediment deposited first in floods
Sediment deposited first in floods
Heaviest sediment
Point bars definition
Point bars definition
Curved deposits on inside bends of meanders
Current speed on inside meander bends
Current speed on inside meander bends
Slow, with low energy
Process on outside meander bends
Process on outside meander bends
Faster water causes erosion
Visual sign of floodplains
Visual sign of floodplains
Wide, flat areas beside the river
Visual sign of levées
Visual sign of levées
Raised banks parallel to river
Why velocity drop causes deposition
Why velocity drop causes deposition
River loses energy needed to carry sediment