Abstract: In this paper, wave forces acting on a submerged circular cylinder movingforward with a constant velocity in regular waves are investigated experimentally. TheReynolds numbers and the Keulegan──Carpenter numbers are in the range: 0.61 × 10￣5Re6.01 × 10￣5,4.61 Kc74.80,The surface pressures of the cylinder and the cylinder’svibrations caused by the hydrodynamic forces are measured,from which the drag and inertiacoefficients(C_D, C_M)in Morison’s formular are analyized, the fiuctuating drag and liftcoefficien...