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AS GEOGRAPHY
HYDROLOGY
4 QUESTIONS
REVISION
LONG PROFILE
OF A RIVER
DEFINITION
The long profile of a river is a longitudinal section of a stream or river
channel from source to mouth.
QUESTION 1
What shape is a theoretical long profile?
ANSWER
Concave.
QUESTION 2
Why are smooth long profiles said to be in a state of equilibrium?
ANSWER
Discharge and available energy are in balance with the available load.
QUESTION 3
What is a knickpoint?
ANSWER
An uneven step in the smooth long profile caused by a band of resistant
rock or rejuvenation.
QUESTION 4
What is the base level of a river?
ANSWER
The lowest point to which a river can erode.
Locally this may be a lake, ultimately it is the sea.

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