A wave pattern created when water waves reflect off a seawall or barrier and interfere with incoming waves.
From French 'clapotis' (slapping/splashing), derived from 'clap' (to slap). The term came from French naval and coastal engineering vocabulary.
Clapotis explains why standing near a seawall during storms is so chaotic—waves bounce back and collide with incoming waves, creating unpredictable violent patterns that can surprise experienced sailors.
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