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.
Geology School Keywords