Matric revision: Geography: Fluvial Processes and Landforms (3/4): Profile of a River

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[@gbalaji5029]

very nice and informative sir

[@davegear9595]

No .... velocity is speed in a downstream direction (velocity has direction, speed does not). A whirlpool has nearly zero velocity because water is going both upstream and downstream. If you throw an orange into a mountain stream, you will easily be able to keep up with it walking downstream. Do the same in the middle of the Vaal or Orange,you will have to run to keep up.

[@natashabesseling4541]

I'm sorry are you saying that the velocity is both lowest and highest in the upper course?

[@snqobilemthembu2502]

The velocity of the river can only be high in the upper course due to the steep sloop

[@davegear9595]

I am sorry, but the content of this video has a serious error in it. The stream velocity is LOWEST in the upper course and HIGHEST in the upper course. It is turbulence and energy that are highest in the upper course. Volume and cross-profile shape are far more important than gradient in determining velocity. I know this is an error that is repeated in almost every text book, but this is information that has been available for nearly 100 years. There are also other errors that I will comment on on the appropriate videos.