Abstract
Objectives Near miss of two ships is a special scene that approaching each other, which can be modeled as an effective method to evaluate potential maritime traffic risks. In terms of time-dimension perspective, Methods temporal model of near-miss is first established using Fujii ship domain to detect near-miss scene, and then the duration of near-miss and average duration are defined. An algorithm for calculating duration of near-miss is proposed, based on the processing for time synchronization of AIS data. Furthermore, the duration of near-miss is used to analysis the time-dimension characteristics of the maritime traffic risk. The Bohai water area is used as the research example to verify the model. Results The correlations between the average duration of near-miss and the ship type and the ship length were found. According to analysis of ship type, the longest average duration of near-misses is 252.63 s which is formed by oil tanker, the least of that is 180 s which is formed by passenger ship. According to analysis of ship size, the longest average duration of near-misses is 272.65s which is formed by large ship, the least of that is 180s which is formed by medium ship. Conclusions The proposed model can be used to calculate duration of near-miss accurately, and it provides a new approach to study maritime traffic risk from the time-dimension perspective.
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