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A stream with cohesive banks that are resistant to erosion will form narrow, deep, meandering channels, whereas a stream with highly erodible banks will form wide, shallow channels, preventing the helical flow of the water necessary for meandering and resulting in the formation of braided channels. [15]
Braid bars often originate from remnants of point bars or the growth of mid-channel unit bars in braided rivers. [1] These features typically form in rivers with a high sediment load, within channels characterized by a large bed load and easily-eroded bank material. [2] There are several mechanisms of formation.
The channel type developed depends on stream gradient, riparian vegetation and sediment supply. Braided rivers tend to occur on steeper gradients where there is a large supply of sediment for braid bars, while single thread sinuous channels occur where there is a lower sediment supply for point bars.
These channels are separated by mid-channel or braid bars. Anastomosing river channels also create mid-channel bars, however they are typically vegetated bars, making them more permanent than the bars found in a braided river channel which have high rates of change because of the large amounts of non-cohesive sediment, lack of vegetation, and ...
These channels are classified as a composite form of which the individual channel belts may have braided, meandering or straight channels. Although similar to, and even encompass other channel types, anastomosed rivers are their own entity and have just begun to be studied by geologists, revealing that much is still unknown.
Natural alluvial channels have a variety of morphological patterns, but can be generally described as straight, meandering, braided, or anastomosing. [3] Different channel patterns result from differences in bankfull discharge, gradient, sediment supply, and bank material. [3]
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 ...
Braided channel – Network of river channels; Canyon – Deep chasm between cliffs; Cave – Natural void under the Earth's surface; Cliff – Tall, near vertical rock face; Cut bank – Outside bank of a water channel, which is continually undergoing erosion; Crevasse splay – Sediment deposited on a floodplain by a stream which breaks its ...