ZIMSEC O Level Geography Notes: River Rejuvination
Rejuvenation-occurs when there is a negative change in a river’s base level (i.e. when the river’s base level falls) which increases its potential energy and thus enables it to revive its erosive energy in the processes.
A river’s base level is the lowest point to which a river can erode.
A negative change in a river’s base level may be brought about by vertical uplift (for example isostatic uplift) or by a fall in the level of the sea for example due to tides.
This change renews a river’s ability to erode due to an increased gradient.
A rejuvenated river erodes vertically into the floodplain to produce new features that are different from those typically found in the flood plain.