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USGS CMG InfoBank: Point Bars and Cut Banks

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Comment: 10:02 - 10:58 (00:56)
Source: Annenberg/CPB Resources - Earth Revealed - 19. Running Water I: Rivers, Erosion and Deposition
Keywords: river, bar, "braided stream", sediment, erosion, deposition, meander, valley, lowland, bank, "flow velocity", "point bar", "cut bank", slope, gradient

Our transcription: Bars are especially common in braided streams which form where sediment choked rivers flow across broad easily eroded slopes.
Bars also commonly occur in meandering rivers.
A meandering river typically wanders across wide valleys and lowlands in a series of S-shaped curves.
Erosion and deposition occur continuously side by side along the banks of meandering rivers.
Low velocity on the inside of a meander curve results in the deposition of "point bars."
On the outside of a curve where velocity is high and erosion normally takes place, "cut banks" form.
Because of this erosion and deposition, both the sizes and positions of meanders continuously change.

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