WATERFALL

Jamie Healy
Mind Map by Jamie Healy, updated more than 1 year ago
Jamie Healy
Created by Jamie Healy over 6 years ago
138
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Description

Formation of a waterfall. Fluvial landform of erosion.
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Resource summary

WATERFALL
1 FLUVIAL EROSION
1.1 Youthful Stage of a River
2 interruption in river profile, vertical drop
2.1 River meets band of soft rock after flowing over hard rock
2.1.1 >differential erosion, hydraulic action, abrasion
2.1.1.1 cuts downwards into soft rock, steepening gradient
2.1.1.1.1 falling water hitting soft rock forms PLUNGE POOL beneath fall
2.1.1.1.1.1 drop= extra velocity
2.1.1.1.1.2 falling water undercuts soft rock by hydraulic action= OVERHANG
2.1.1.1.1.2.1 HARD rock deeply undercut> collapses
2.1.1.1.1.2.1.1 repeated many times> headward erosion of waterfall
2.1.1.1.1.2.1.1.1 waterfall retreats upstream > GORGE
2.1.1.1.1.2.1.1.1.1 waterfall is temporary, headword erosion will result in developing regular profile
2.1.1.1.1.2.1.1.1.2 NIAGARA FALLS= GORGE
3 Pollaphouca falls, river liffey, co wicklow

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