Operational limitation of Indonesian traditional wooden boat in the framework of second generation intact stability criteria

Abstract

Recently, the International Maritime Organization (IMO) developed the second generation intact stability criteria for all possible capsizing scenario in seaways with performance based approach. This paper presents application of the criteria to investgate operational limitation of an Indonesian traditional woooden boat for dead ship condition. The hydrodynamic characteristics of the ship are determined by model experiment except the effective wave slope coefficient is calculated using the simplified Froude-Krylov assumption of roll exciting moment and the formula of weather criterion. The wave characteristics are described by JONSWAP spectrum based on the wave statistic of Flores sea and the gusty wind is calculated by Davenport spectrum. The results show that the Indonesian traditional wooden boat comply with the criteria when the downflooding angle is larger than 25.0 degrees. The vulnerability criteria level 1 and the vulnerability criteria level 2 of the criteria are not consistent when the effective wave slope coefficient is calculated using the formula of weather criterion but it is consistent when the simplified Froude-Krylov assumption is used. The inconsistency could appear due to the geometry characteristics of Indonesian traditional wooden boats which are different from the geometry characteristics of ships used to develop the weather criterion as the level 1 of vulnerability criteria.