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The Rakaia River in the South Island of New Zealand is braided over most of its course. A braided river (also called braided channel or braided stream) consists of a network of river channels separated by small, often temporary, islands called braid bars or, in British English usage, aits or eyots.
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.
Often confused with braided channels, anastomosing is reserved for a type of river with multiple, interconnected, coexisting channel belts on alluvial plains. Based on its geomorphology, saucer-shaped islands called flood-basins characterize anastomosing rivers. [ 5 ]
Braided rivers have complex and unpredictable channel patterns, and sediment size tends to vary among streams. [3] It is these features that are responsible for the formations of braid bars. Braided streams are often overfed with massive amounts of sediment which creates multiple stream channels within one dominant pair of flood bank plains. [2]
The elongation of the braid bar causes further flow changes across the channel. The change in flow causes more scour of the riverbed and bank erosion downstream and the opposite bank from the braid bar. [3] New Braid Bars: Deposition occurs downstream from the main braid bar, but still attached to the bar-tail. With further deposition, it will ...
Braided rivers have a channel that consists of a network of small channels separated by small and often temporary islands called braid bars. Also called braided streams, anastomose streams or anastomose rivers.
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 ...
For much of its length, it is a classic wide, muddy and shallow braided stream which in the lower reaches flows in a floodplain bordered by bluffs. [11] During pioneer days, the common humorous description was that the Platte was "a mile wide at the mouth, but only six inches deep." 49ers said it was "too thick to drink, too thin to plow". In ...