Modeling of Ship Motion Responses and its Applications in Risk-Based Desing and Operation of Entrance Channels

Abstract

This paper presents the parametric modeling method of ship motion responses for risk-based optimization and operation of channel depths. The study focuses on computing response motion spectra as a function of the sea states (described by significant wave height Hs and wave period Tz) and transit conditions (ship speed V and loading T) using parametric modeling technique in combination with a numerical ship motion model; and then using these spectra applying a probabilistic model to determine the ship grounding risk. This makes it possible to establish the accessibility policy in which the guidance information for the safe transits will be provided. On basis of the developed accessibility policy a long-term optimization of entrance channel depths can therefore be implemented. The aforementioned approach has been applied to Cam Pha Coal Port in Viet Nam as a case study.