Features produced by rejuvenation

maddiemurchie23
Note by , created over 6 years ago

Geography (Rivers) Note on Features produced by rejuvenation, created by maddiemurchie23 on 04/29/2013.

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maddiemurchie23
Created by maddiemurchie23 over 6 years ago
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Knick pointWhen base level falls a 'kink' or step is noticeable in the long profile, this marks the previous base level. The renewed erosion start to regrade itself to reach the perfect profile.

River TerracesTerraces are the level steps either side of the river valleys which mark the level of the old flood plain.

Rejuvenation is when a river has renewed energy to erode. It happens when the base level of a river falls renewing the river's potential energy to erode down into its new base level.

Eustatic change - base level fallsdrop in temp. (ice age)

Isostatic change - land rises movement in plate tectonics isostatic rebound

Incised meandersThe result of established meanders cutting vertically into the landscape

Ingrown meaders vertical erosion is slow  meander migrates within its newly developed floodplains

Entrenched meanders rapid vertical erosion creates a winding gorge

Differential erosion takes place as the softer rock underneath erodes faster than the hard rock

Abrasion and hydraulic action causes the steep back wall to form

This carries on undercutting the hard rock until a plunge pool is formed

Water cascades over the cap of hard rock

Undercutting collapses the hard rock as it isn't supported into the plunge pool

These rocks are then eddied which deepens and widens the pool

As the 

As the cliff keeps being undercut it continues to collapse causing the waterfall to retreat leaving a gorge

Rejuvination

Waterfalls