Abstract
With the growth of traffic density, traditional collision risk models cannot thoroughly describe the complex traffic any more. Therefore, in this paper, a marine traffic situation complexity model, which is based on the relationship between ships, is introduced to metric the complexity of vessel traffic. Firstly, traffic density factor and traffic conflict factors are considered to construct the traffic unit complexity model, reflecting the traffic complexity and traffic characteristics; Secondly, by extending the traffic unit complexity model into the own-ship complexity model, the influences of the positions of other ship on the complexity spatial distribution are analysed; Finally, two scenarios are imported to validate the availability of the complexity model. The verification results show that the complexity can respond to different route structures and traffic situations sensitively.
Highlights
The tendencies of the marine traffic density increasing has increased the difficulty of water traffic management
Two experiment groups are designed: T1, which is set on the paralleled traffic, is to analyze the variation of complexity caused by relative distance; T2, which is set on the “cross” intersection, is to analyze the variation of complexity caused by traffic conflict
We can see that shorter the distance between other-ship and own-ship is, higher the complex degree of the own-ship caused by the other-ship will be, which well reflected the relationship between traffic density and complexity
Summary
The tendencies of the marine traffic density increasing has increased the difficulty of water traffic management. There have been some progresses in complexity researching in the fields of air transportation and road traffic: One the one hand, researchers use linear[2] and nonlinear[3] modelling methods to construct the dynamic density model of airspace complexity.[4] On the other hand, researchers think complexity can be considered as the subjective description of traffic situation using intrinsic properties[5]. Intrinsic properties complexity is used to research the marine traffic situation, and two complexity factors of traffic density and traffic conflict are proposed to construct the complexity model, verification is made. Researches on the traffic situation complexity can be carried from vessel traffic density and geometrical relationships between vessels. The traffic relationship unit VCij (Vessel Couple) constructed by two ships of i and j is defined
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