Downcutting
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Downcutting, also called erosional downcutting, downward erosion or vertical erosion, is a geological process by hydraulic action that deepens the channel of a stream or valley by removing material fr
Several stages of downcutting by the San Juan River in Utah can be identified in this 1927 photo. Remnants of former floodplains stand as terraces above the river's modern level.
Upland and lowland
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Upland and lowland are conditional descriptions of a plain based on elevation above sea level. In studies of the ecology of freshwater rivers, habitats are classified as upland or lowland.
Downcutting
…the rate of lateral erosion increases. This is why streams in mountainous areas tend to be narrow and swift, forming V-shaped valleys, while streams in lowland areas tend to be wide and slow-moving, with valleys that are correspondingly wide and flat-bottomed. The stream gradient is the ratio between the…
Cascadilla Creek, near Ithaca, New York, in the United States, an example of an upland river habitat
Amazon River near Manaus, Brazil, an example of a lowland river habitat
Aerial view of Slapton Sands and northern part of Ley geograph.org.uk 1434412
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