A COMPREHENSIVE ASSESSMENT SYSTEM FOR THE MARITIME TRAFFIC ENVIRONMENT

It is desirable when drawing up a maritime traffic environmental proje ct or a project for consolidating port and harbour facilities, that th e safety of the maritime environment for shipping-traffic is assessed quantitatively, and that the rationale of a given project and the prop osed safety measures are evaluated in an objective manner. In this rep ort, the system flow and procedures to integrally assess the safety of the maritime traffic environment by systematically combining various simulation techniques are discussed first. Subsequently, the quantitat ive risk evaluation procedure for collisions of ships in waters with a high traffic density, among the assessment procedures above, and an o utline of the shipping traffic flow simulation capable of reproducing ships' movements, are described. In evaluating the results of simulati ons, a method introducing Subjective Judgement values (SJ-values) as i ndexes manifesting the subjective degree of danger felt by shiphandler s, is shown. The SJ-values were experimentally determined from simulat or experiments using parameters representing the relation ship with ot her ships proceeding in the vicinity.Finally, some of the results of s tudies conducted for the recent construction of new LNG berths in Toky o Bay are introduced as an example of practical safety assessment in t his field.