Everything about Delta Switching totally explained
Delta switching, also known as
avulsion, is the process by which some
rivers - such as the
Mississippi River - change their course near their
deltas.
The flow of a river is controlled by its
gradient, which decreases as it nears the ocean, becoming nearly zero at the delta's toe. Eventually, a delta can build so far out into the ocean that its gradient becomes too low to support the river's current; an event such as a flood can cause it to break a natural
levee upstream, creating a new, steeper river channel that forms another delta., The abandoned delta eventually subsides.
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