a knickpoint is the break-in slope of a river profile caused by a rejuvenated river.
there is often a waterfall at a knickpoint, called a knickpoint waterfall.
Augrabies falls on the orange river (Gariep) in South Africa is an example of knickpoint waterfalls
when rejuvenation of the river flowing on a wide valley occurs, the new valley is curved into its own floodplain
this produces steps on either side of the valley.
these are terraces, and they often occur in pairs on either side of the valley
an incised meander is a deep, steep-sided meander (bend) formed by severe downward erosion of the existing meander. such erosion is brought about by the rejuvenation of the river.
incised meanders forms when rejuvenation occurs in the stream which is already meandering
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