Abstract
This paper aims to establish the systematic estimation method of the wave force acting on the submerged sphere. First, the stochastic characteristics of the vertical wave force showing irregular time variation even under the regular wave train are discussed, in which the Weibull distribution is employ to express the appearance probability distribution of the period and maxima of it. The mean values of the Weibull parameters are given in this paper so that the mean values of such vertical wave forces can be evaluated. Then, the validity of the simplified Morison and modified Morison equations are discussed and the ranges in which the simplified estimation methods are applicable are given graphically. Based on the present study, the wave force acting on a submerged sphere under any conditions becomes to be evaluated with the simple and reliable estimation method.
