
In hydrodynamics, the clapotis (from `lapping of water`) is a non-breaking standing wave pattern, caused for example, by the reflection of a traveling surface wave train from a near vertical shoreline like a breakwater, seawall or steep cliff. The resulting clapotic wave does not travel horizontally, but has a fixed pattern of nodes and antinode.....
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http://en.wikipedia.org/wiki/Clapotis

A standing wave phenomenon associated with the reflection of an ocean-wave train from a vertical surface, such as a breakwater or pier.
Found on
http://www.encyclo.co.uk/local/20124
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