Created by maddiemurchie23 over 6 years ago
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 cliff keeps being undercut it continues to collapse causing the waterfall to retreat leaving a gorge