Seiche
From BAWiki
Definition
Standing wave in the water bodies of lakes, inland seas, bays or harbors.; Standing long-period waves in completely or partially closed basin.; A standing wave oscillation of an enclosed water body that continues, pendulum fashion, after the cessation of the originating force, which may have been either seismic or atmospheric.
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Source
Glossary of Coastal & Hydraulics Laboratory (CHL), US Army Corps of Engineers (USACE), Vicksburg, USA