Landforms Of Rejuvination Flashcards
What do unpaired river terraces look like
At different levels on different sides
Terraces create steps in valley cross profile
Where do river terraces usually occur
Lower course as this is where flood plains are, river has the. Off energy so the most lateral erosion.
Formation of river terraces
When a rejuvenated river cuts down through the floodplain leaving old flood plain at a higher level than the river. When the valley is widened by lateral erosion them terraces are cut back
Examples of river terraces
Cambridge river cam,
London river Thames
What do entrenched meanders look like
Widening gorge, symmetrically shaped cross profile
What do ingrown meanders look like
Eroded vertically and laterally, asymmetrical river valley, steep cliffs on outside bend
Where in a rivers course are entrenched and ingrown meanders most likely to occur
Middle or lower course as this is where meanders form.
More kinetic energy for lateral erosion - widening
Formation of entrenched meanders
Caused by rapid vertical erosion or where valley sides are more resistant to erosion.
May happen when uplift is more rapid
What do paired river terraces look like
On same level at each side of the channel
Formation of ingrown meanders
Happens when vertical erosion is slower and happens over a long period of time
Lateral erosion also happens
Example of entrenched meander
River wear,Durham
Example of ingrown meander
River Wye, tinton abbey
What do knickpoints look like
Sudden change in a rivers gradient where old long profile joins the new,
Are usually marked by waterfall or Rapids
Where in a rivers long profile do knickpoints usually occur
The upper course as this is where waterfalls form, most vertical erosion
Formation of knickpoints
When there’s a different rate of erosion above and below a knickpoints. Can also be caused by changes in base level
