When a fully submerged horizontal circular cylinder close to a free surface moves horizontally below the free surface, concurrent vortex-shedding and surface-wave phenomena are observed. Associated with the vortex shedding, various surface-wave phenomena are observed; small-amplitude waves, surging breaking waves, collapsing breaking waves and straight-streamline jet-like flows over the upper surface of the cylinder etc. We study on the fluid mechanics around a circular cylinder close to a free surface.