Knickpoints (Rejuvenation) Flashcards
Why are knickpoints formed?
When a river is rejuvenated, adjustment to the new base level starts at the sea and works its way up; the knickpoint shows where the long profile joins to the new one.
What determines the rate that the knickpoint recedes upstream?
The resistance of the rocks, knickpoints may linger at a relatively hard outcrop.
How are waterfalls linked to knickpoints?
Knickpoints may develop into a waterfall but can be difficult to determine due to variability in rock type or rejuvenation.
Headward erosion in the waterfall can mean it cuts back through the valley towards its source until the long profile eventually adjusts to its new energy equilibrium.
What is a knickpoint?
A sudden break or irregularity in the gradient along the long profile of a river. The river is encouraged to change its long profile due to rejuvenation.
