Wavelet Analysis for Ship Rolling Motion of Purse Seiners in North Sulawesi, Indonesia

Abstract

A study of coastal fishing boats (small purse seiners) was made in North Sulawesi province, Indonesia. The goal of this study is to clarify the rolling motion under fishing operation ofthe srnall purse seiners. First of a!1 we examined the boat form of the purse seiners and practical conditions of rolling motiQn under fis operations. Based Qn the data, the characteristics such boat's stability and calculated. The results of the analysis are as fbllows: the boat types werc relatively slim around the huils, and the boats had the round shape under water, and a boat still used by fisherrnen had extremely poor stability, and the roll angle increased remarkably in stage when the boat crossed the wave dircction with hauling process, and results of Wavelet analysis showed that the purse seiners used in North Sula"'esi had the same characteristics of roLling motion, and wavelet cocfficients became large in hauling process. study,