Rejuvenation Quiz

A quiz on rejuvenation with some case studies, to test yourself for revision.

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  • Created by: Lizzy
  • Created on: 07-04-12 18:52

How does rejuvenation occur?

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It occurs when there is either a fall in sea level relative to the level of the land or a rise of the land relative to the sea 

This enables a river to renew its capacity to erode as its potential energy is increased

The river adjusts to its new base level - at first in its lower reaches and then progressivley inland

This can create a number of landforms: knickpoints, waterfalls and rapids, river terraces and incised meanders

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What are knick points?

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A sudden break or irregularity in the long profile of a river 

Some are sharply defined such as waterfalls - others barely noticable

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What is a river terrace?

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A remnant of a fomer flooplain which has been abandoned at a higher level due to the renewed downcutting of a river

The terraces will cut back as the new valley is widened by lateral erosion

This process may be repeated several times leading to terraces at a number of different levels

Terraces provide useful shelter from floods and are ideal as natural routeways for road and rail 

An example is near Kasbeki, Georgia

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What are incised meanders?

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There are 2 types: entrenched or ingrown

If a rejuvenated river occupies a valley with well developed meanders, renewed downcutting results in them becoming incised 

If incision is rapid, the valley will be symmetrical with steep sides and a gorge like appearance - ENTRENCHED MEANDER

An example of an entrenched meander is in San Juan, southeastern Utah

When incision is slower and more lateral erosion is occuring - an INGROWN MEANDER may be produced. The valley becomes asymmetrical, with steep cliffs on the outer bends and more gentle slip-off slopes on the innner bends.

an example of an incised meander is on the River Wye, Tintern Abbey

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