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How do rivers form braided channels?

GeographyRivers

Quick Answer

Braided rivers form when a river carries lots of sediment and its flow shifts across many shallow channels. The bars of gravel and sand split the water into a braided pattern.

The Full Story

Braided rivers usually appear where a river has a steep gradient, a large sediment load, and variable discharge. When the water slows or deposits gravel and sand, bars build up in the channel and divide the current into multiple branches. Floods often rearrange the channels, so the river constantly changes shape. Braided rivers are common in glacier-fed valleys and in places where erosion supplies abundant coarse material.

Key Facts

1.Braided channels form from heavy sediment deposition
2.Floods can reshape the channels quickly
3.They are common in glacier-fed or steep rivers

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