In the ocean where fresh water meets salt water there will be a "halocline". The salt water being heavier and staying on the bottom and the fresh water being lighter and floating on top. In the few inches of mixing and transition is the halocline that is wavy looking like you describe. Kind of shimmering and fuzzy to look through.
You can see this many places along the Mexican Yucatan coast line where underground rivers dump into the Caribbean either by openings on the shallow ocean floor or coming out of lagoons.
It is possible the thermocline you saw could also have had some different chemical content causing some of the wavy look, although I suspect just the density of the cold vs warm water would do it also.
It is a very cool phenomena.
Last edited by snrub; 06/26/18 04:24 PM.
