Evaluation of Navigation Safety of Port Waters Based on SPA

Many factors affect the navigation safety of the port waters and most of them are indeterminate. Therefore, we can take them as part of an uncertain system, which consists of ship subsystem, human subsystem, environment subsystem, pilot service subsystem and port service subsystem. The paper puts forward a Set Pair Analysis (SPA) theory on the evaluation of navigation safety of port waters, which can make full use of information on factors influencing navigation safety of the port waters. By using SPA in evaluation of navigation safety of the port waters, not only the factors influencing navigation safety of the port waters but also the factors' weight is fully considered and the relationship among them is reflected. SPA can improve the navigation safety of the port waters. It is helpful to improve the safety situation of the port waters and the navigation efficiency of the port waters to prevent the occurrence of water traffic accidents. It is a new method and is also feasible to evaluate navigation safety of the port waters based on SPA. And prospecting the application of SPA in port safety assessment, it can be expanded in space and time aspect.