swash

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swash

1. a sandbar washed by the waves
2. a channel of moving water cutting through or running behind a sandbank
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

swash

[swäsh]
(geology)
A narrow channel or ground within a sand bank, or between a sand bank and the shore.
A bar over which the sea washes.
(oceanography)
The rush of water up onto the beach following the breaking of a wave. Also known as run-up; uprush.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.