Abstract

A lot of studies about mooring ship motions have done in recent decades, but they are focused on cargo handling criteria. At some ports in open sea, mooring ships move so hard and sometimes mooring lines or fenders are broken. So, when we think about mooring criteria, we have to consider a lot of parameters. In this paper, we study about these parameters and we pick up some cases of mooring accidents at the harbor face to Pacific Ocean. And we find out the results as follows : (1) We can't argue about the mooring criteria correctly if we focus only on ship motions. (2) We can clear up the relation between cargo handling criteria and the mooring criteria. (3) Mooring accidents tend to take place in winter season than other seasons in these cases. (4) In most of those accident cases, mooring ships should shift to offshore earlier stage. (5) The required time length when ships shift to offshore depends on the ship type, the cargo handling way, etc. (6) The difficulty of wave prediction makes so hard to make out mooring criteria. (7) We have to consider long period wave in case of considering the mooring criteria. (8) There are trade off relations between the safety of mooring ship and the berth efficiency. (9) It is necessary to grasp the effect of moored ship motions by wave and wind correctly, if we want to avoid mooring accidents.

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