-Wave effects ignored
The Stokes drift is a downwave drift induced by the orbital motion that water particles undergo under the influence of a wave field. These particle orbits are not closed and a Lagrangian drift is set up. This drift is confined to a narrow layer next to the sea surface (Kundu, 1990, pp. 223–225). It is well known that the Stokes drift can be a dominant factor in the advection of suspended material and objects on the sea surface.