WATERFALL

Description

Formation of a waterfall. Fluvial landform of erosion.
Jamie Healy
Mind Map by Jamie Healy, updated more than 1 year ago
Jamie Healy
Created by Jamie Healy about 11 years ago
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Resource summary

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

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