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Definition of Swash:
Up and down propagation of bores formed after collapse of waves on the beach. Swash is the decelerating uprush phase and backwash is the accelerating downrush phase.
This is the common definition for Swash, other definitions can be discussed in the article


On dissipative coasts swash processes are dominated by infragravity waves.

Swash on a reflective beach, Avoca Beach, NSW, Australia. In the background, a wave collapses on the beach; the swash uprush reaches the top of the beach berm. Photo credit: Dr Hannah Power, University of Newcastle, NSW, Australia.

Related articles

Wave run-up
Swash zone dynamics