Abstract
This paper is to discuss experimentally the wave forces acting on a submerged sphere in the two-component composite wave field. The measured wave forces are decomposed into the drag and inertia forces using the Morison's formula. The maximum wave force, the drag and inertia coefficients of individual waves defined by the zero-downcrossing method are mainly investigated in the relation to those of regular waves. Time variations of the water surface profile have significant effects upon the characteristics of the wave forces. The maximum wave force and inertia coefficient of the successive waves whose heights are increasing are shown to be larger than those of the successive waves whose heights are decreasing. Their variations become larger as the difference of the successive wave heights become larger.
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