Abstract
Past studies have shown that, in a wave field, fluctuation of the water surface has a profound influence on the wave induced force on objects placed close to the still water level. A recent study examined the effects of free surface fluctuation on the total wave force on a rigid vertical cylinder of small diameter extending from sea floor to beyond the still water level. The waves were considered long-crested, stationary and linear with a narrow-band spectrum and the wave force was evaluated using the Morison formula. In this study, the waves are treated as second order nonlinear Stokes waves with narrow-band characteristics. The effects of wave nonlinearity and free surface fluctuation on the mean and standard deviation of total wave force on a rigid vertical cylinder are examined.
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