In fluid dynamics , gravity waves are waves generated in a fluid medium or at the interface between two media when the force of gravity or buoyancy tries to restore equilibrium . An example of such an interface is that between the atmosphere and the ocean , which gives rise to wind waves .
In fluid dynamics , gravity waves are waves generated in a fluid medium or at the interface between two mediums ( e.g. the atmosphere or ocean ) which has the restoring force of gravity or buoyancy .