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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.
A wide variety of river and stream channel types exist in limnology, the study of inland waters.All these can be divided into two groups by using the water-flow gradient as either low gradient channels for streams or rivers with less than two percent (2%) flow gradient, or high gradient channels for those with greater than a 2% gradient.
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 ...
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 ...
When referring to river channel migration, it is typically in reference to meandering streams. In braided streams, channel change is driven by sediment transport. [1] It has been proposed that lateral migration is a particularly dominant erosive process in savanna landscapes. [2]
The water level differences in braided systems are themselves caused by closure of branch entrances as a result of bar growth. [13] In addition to bar growth, differences in direction of bifurcated river flows from compound bar shapes and backwater effects also influence the evolution of the braided system.
Channel patterns are found in rivers, streams, and other bodies of water that transport water from one place to another.Systems of branching river channels dissect most of the sub-aerial landscape, each in a valley proportioned to its size.