  The goal of this note is to provide a theoretical explanation for the
saturation of the drag coefficient in strong wind conditions. The hydrodynamic
model under consideration takes into account the important effects of airborne
droplets of water in a thin layer above the water surface that effectively
behave as a different fluid between the water and the air. Above this layer the
model is coupled with a log-wind profile for the strong winds blowing above the
sea. The main underlying mechanism governing the behavior of the drag
coefficient is the Kelvin Helmholtz instability for capillary waves on the
water surface and the continuity of shear stress along the intermediate
interface.
