Isostatic changes that changes Irelands Landscape - Fluvial

Question 1

Intro

Answer 1

Isostasy is the vertical movement of the earths crust which causes it to rise and fall relative to sea level.
The last ice age ended 100,000 years ago.
This caused isostatic rebound to occur throughout the European Continent.
The continents rebound made sea levels to fall.

Question 2

How isostasy can effect a fluvial landscape

Answer 2

Isostacy can affect a fluvial landscape after the crust rebounds.
The river must erode downwards to reach sea levels.
This caused river rejuvenation.
This is when the river must erode downward and it takes the characteristics of a river in the youthful stage, flowing quickly into the river bed.

Question 3

Formation of a paired terrace

Answer 3

A landform primed by isostacy are paired terraces.
This is a stepped river valley that occurs along a rivers mature and old stage.
River rejuvenation causes the vertical erosion of the role river valley along its old and mature stages.
As it does so, it carved out a new river valley floor in its old floodplain.
This is called a paired terrace.
It has both sides standing at equal height above the new valley floor.
An example is the River Dodder Co. Dublin.

Question 4

Incised Meanders

Answer 4

Incised meanders can also form.
This is a meander that has eroded deep into the river valley.
This deepens in the mature and old stages.
When a river is rejuvenated it has more energy, this is more erosive.
The meanders formed prior to the rivers rejuvenation are depend due to the erosive strength of the river.
It can also form steep cliffs.
These are incised meanders.
An example of this is at the San Juan River Utah USA