From AMS Glossary
Revision as of 19:38, 26 January 2012 by Perlwikibot
In hydrodynamics, the motion of a fluid particle induced by the passage of a progressive gravity wave.
When the wave height is small and the fluid depth is great, the orbit is a circle the radius of which decreases exponentially with depth. In shallow fluids, the orbit is an ellipse, which degenerates into a horizontal line at the bottom boundary of the fluid.