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River channel migration is the geomorphological process that involves the lateral migration of an alluvial river channel across its floodplain. This process is mainly driven by the combination of bank erosion of and point bar deposition over time. When referring to river channel migration, it is typically in reference to meandering streams.
Stable material on the river bed mitigate erosion, [10] removing this armoring layer of gravel, boulders, etc. exposes the channel bed to the erosive force of the water. "On the Russian River near Healdsburg, California, instream pit mining in the 1950s and 1960s caused channel incision in excess of 3-6 m over an 11-km length of river." [5]
Erosion is the action of surface processes ... In a homogeneous bedrock erosion pattern, curved channel cross-section beneath the ice is created.
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 from the stream's bed or the valley's floor.
Where the new channel's slope is about the same as the old channel's slope, a partial avulsion will occur in which both channels are occupied by flow. [9] An example of an erosional avulsion is the 2006 avulsion of the Suncook River in New Hampshire , in which heavy rains caused flow levels to rise.
As erosion of the knickpoint and the streambed continues, the head cut will migrate upstream. [3] Groundwater seeps and springs are sometimes found along the face, sides, or base of a head cut. [4] [5] Channel incision is very common when head cuts are involved in stream morphology. In terms of stream restoration, head cuts are one of the most ...
Headward erosion is erosion at the origin of a stream channel, which causes the origin to move back away from the direction of the stream flow, lengthening the stream channel. [1] It can also refer to the widening of a canyon by erosion along its very top edge, when sheets of water first enter the canyon from a more roughly planar surface above ...
The terms river morphology and its synonym stream morphology are used to describe the shapes of river channels and how they change in shape and direction over time. The morphology of a river channel is a function of a number of processes and environmental conditions, including the composition and erodibility of the bed and banks (e.g., sand, clay, bedrock); erosion comes from the power and ...