274780
Description
Mind Map by Jamie Healy, updated more than 1 year ago
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Created by Jamie Healy
over 10 years ago
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WATERFALL
- FLUVIAL EROSION
- Youthful Stage of a River
- Youthful Stage of a River
- interruption in river profile, vertical drop
- River meets band of soft rock after flowing over hard rock
- >differential erosion, hydraulic action, abrasion
- cuts downwards into soft rock, steepening gradient
- falling water hitting soft rock forms PLUNGE POOL beneath fall
- drop= extra velocity
- falling water undercuts soft rock by hydraulic action= OVERHANG
- HARD rock deeply undercut> collapses
- repeated many times> headward erosion of waterfall
- waterfall retreats upstream > GORGE
- waterfall is temporary, headword erosion will result in developing regular profile
- NIAGARA FALLS= GORGE
- waterfall is temporary, headword erosion will result in developing regular profile
- waterfall retreats upstream > GORGE
- repeated many times> headward erosion of waterfall
- HARD rock deeply undercut> collapses
- drop= extra velocity
- falling water hitting soft rock forms PLUNGE POOL beneath fall
- cuts downwards into soft rock, steepening gradient
- >differential erosion, hydraulic action, abrasion
- River meets band of soft rock after flowing over hard rock
- Pollaphouca falls, river liffey, co wicklow
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