Research On Supervision Methods Of Vessel Collision, Grounding Risks At Sea

In order to study the supervision methods of collision and grounding risks for vessel at sea, to set up the last defense line of safe navigation in coastal line and to prevent the environmental pollution in coastal water, and to avoid the occurrence of vessel traffic accident, this dissertation summarizes the present situation and the existing problems of research on vessel collision, vessel grounding and decision support by domestic and overseas scholars, studies on the risks of vessel collision, vessel grounding and the related practical actions to avoid the vessel collision and grounding. The concepts and calculation methods of the time to close-quarters situation of approach (TCQA) and the time to close-quarters situation of ground (TCQG) are studied and proposed. The supervision criterion and the supervision evaluation mathematical model of collision and grounding risks for vessel are presented. Based on the fact that AIS is playing more and more important role in the field of vessel navigation safety, a long-distance and multi-terminal network of digital VHF radio telephone (Net VHF) is proposed and well organized for developing by the author. Finally, the design mentality of intelligent decision support system for the supervision of collision and grounding risks for vessel at sea is proposed.The mathematical models proposed in the paper are verified by using of the simulation method. The results show that the models can make full use of the information provided by AIS, VTS and ECDIS, can consider the main factors that affect the supervision of vessel collision and grounding risks, and can meet the requirements of the long-distance and real-time supervision of vessel collision and grounding risks. Among the results, TCQA and TCQG can be used as a new method to judge and alarm the vessel collision and grounding risks, avoiding the deficiencies of regarding TCPA as one of the direct factors to judge the vessel collision risk and using the guard line to alert the vessel grounding risk in the previous studies; as a new mode of ship-to-shore radio telephone communication, Net VHF expands the communication distance of VHF on shore, with the AIS information network covering the same long-distance and real-time ship-to-shore radio telephone communication, and meets radio telephone communication needs of the long-distance supervision of vessel collision and grounding risks; The intelligent decision support for supervision of collision and grounding risks vessel at sea is realized with the real-time evaluation and decision-making of the current and the most biggest vessel collision and grounding risks, the urgent degree to close-quarters situation of approach, as well as the suggestion of avoidance actions of vessel collision and grounding, in the basic framework of intelligent decision support system for supervision of collision and grounding risks for vessel at sea.