On the influence of sea state idealizations and wave directionality in dynamic stability assessments

Simplified spectral based methods, concluded feasible for on-board analysis of dynamic stability limits in previous studies, are here adjusted for use in short crested seas and applied on a RORO ship using detailed forecast 2D wave spectra and corresponding idealized spectra. The general trend is that the idealized spectra result in over prediction of the probability of exceeding dynamic stability limits with a few exceptions resulting in under prediction. The results highlight the importance of proper representation of the wave environment in dynamic stability assessments. The results are discussed in the context of operational guidance and routing. QC 20150507