Standard wave scatter table limitation for evaluating SGISC based on hindcast data analysis

• Published in: Applied Sciences
• Main Authors: Mangalathu Raj, S, Enshaei, H, Abdussamie, N
• Format: Article in Journal/Newspaper
• Language: English
• Published: MDPIAG 2023
• Subjects: Engineering; Maritime engineering; Ocean engineering; North Atlantic
• Online Access: https://doi.org/10.3390/app13021181; http://ecite.utas.edu.au/155033

The operational measure (OM) of the Second-Generation Intact Stability Criteria (SGISC) isthe initial step toward the design of a performance-based dynamic stability assessment of the ship byconsidering the vessels operation, loading condition and weather parameters. The SGISC recommendsthe standard wave scatter table (WST) for the environmental data, an indefinite requirementfor a simplified assessment pathway, which provides the probability of wave occurrence. The existingstandard WST was developed based on the North Atlantic Ocean. The study aims to identify thediscrepancy in the probability of wave occurrence in the IMO-recommended WST when comparedwith developed hindcast WST for smaller regions of the North Atlantic Ocean for the applicationof the SGISC. This study is one of a kind and very significant, given that the assessment using thestandard WST provided unrestricted operational ability to ship under the SGISC. The findings of thisresearch provide insights into significant differences in the existing standard WST when comparedgraphically with hindcast data, especially across different seasons of the North Atlantic Ocean. A casestudy of OMs on the C11 class post-Panamax container ship for excessive acceleration is providedto better represent the study. In the case study, the operational limitation defined by the hindcastWST for individual sea areas and seasons is compared with the standard WST. This investigationshows that regional and seasonal operational limitations are required for season 4 operation beyondthe standard WST safety estimation and that the operational limitation achieved with standard WSTis not adequate. The findings suggest that the identified limitations significantly limit the use of astandard WST for unrestricted operational validation in the SGISC. The provided recommendation isvery relevant in improving the safety assessment using vulnerability criteria, given that the hindcastdata are reliable and available for the season and are also region-specific, and hence the accuracy ofthe ...