Assessment of operational risks of parametric roll. Discussion. Authors' closure

This paper presents the results of an initial attempt to quantify the operational risk of parametric roll for a large containership. The operational risk is determined by analyzing the simulated motions of a ship steaming a given route over a five-year period. In the simulation a weather hind cast (waves and wind) is used to evaluate the sustained speed and ship behavior for each 2-hour time step. Both voluntary and involuntary speed loss are taken into account. The paper pays attention to the statistical aspects of the interpretation of the results.