What are the features of a braided river channel?

A braided river channel features multiple channels that split and rejoin, forming a complex network within a larger river.

A braided river channel is a unique type of river morphology that is characterised by a network of small channels that divide and recombine numerous times. These channels are separated by small, often temporary, islands known as braid bars or, in British English, aits. The braided pattern develops where the sediment load is so heavy that some of it is deposited as shifting islands or bars between the channels.

The formation of a braided river channel is typically associated with a high sediment load and a steep gradient. This is because the high sediment load, often a result of glacial, mountainous, or desert environments, leads to frequent deposition within the river. This deposition then causes the river to split into multiple smaller channels, creating the braided pattern. The steep gradient, on the other hand, provides the energy needed for the river to transport the large amounts of sediment.

Braided rivers are also characterised by their dynamism. The channels within a braided river are constantly changing, with new channels forming and old ones disappearing as the river deposits and erodes sediment. This makes braided rivers highly variable in their form and flow.

In terms of physical geography, braided rivers are often found in environments where there is a large supply of coarse sediment, such as glacial outwash plains, alluvial fans, and river deltas. They are less common in lowland areas where the sediment is finer and the river's energy is lower.

Overall, the key features of a braided river channel are its multiple, interweaving channels, its high sediment load, its steep gradient, and its dynamic nature.