Abstract
In order to study the ship traffic flow in LaoTieshan channel, this paper rewrites the rules of NS (Nagel-Schreckenberg) model of Cellular Automata (CA) based on AIS（Automatic Identification System） data. By referring to the idea of synchronous flow in three-phase traffic flow theory and introducing the speed adaptation mechanism into the simulation, the new model reproduces the traffic flow of LaoTieshan channel and gets the relevant fundamental diagrams. Compared with the actual flow-density diagram drawn from AIS data, it is found that the simulated flow generated by the improved model is more in line with the actual condition, and also conforms to the phase transition of traffic flow in LaoTieshan channel. The method and idea of the simulation are helpful to explain and investigate some complex situations in LaoTieshan channel.
Highlights
As a research method of complexity science, Cellular Automata (CA) is widely used in the research of physical phenomena, road traffic and so on, and increasingly used in the research of traffic flow in busy waterways
Hongxiang Feng [1] rewrites the rules of NS model based on AIS data, so as to analyze the three-phase change of traffic flow in channels; Qiang Meng [2] proposes a discrete model based on the Cellular Automata model by analyzing the characteristics of the Singapore Strait according to the subjective decisions of the ship pilot; Le Qi [3] discovers the possibility of "pseudo lane change" when studying the narrow channel,so he puts forward a new Cellular Automata model based on space-logic rules
We set a threshold at the entrance of LaoTieshan channel in the southeast to northwest route, and statistics of the number of ships arriving every day for 90 consecutive days from June to August are used to calculate the arrival rules of ships [4][5]
Summary
As a research method of complexity science, Cellular Automata (CA) is widely used in the research of physical phenomena, road traffic and so on, and increasingly used in the research of traffic flow in busy waterways. Hongxiang Feng [1] rewrites the rules of NS model based on AIS data, so as to analyze the three-phase change of traffic flow in channels; Qiang Meng [2] proposes a discrete model based on the Cellular Automata model by analyzing the characteristics of the Singapore Strait according to the subjective decisions of the ship pilot; Le Qi [3] discovers the possibility of "pseudo lane change" when studying the narrow channel ,so he puts forward a new Cellular Automata model based on space-logic rules. All of the above studies are based on the analysis of AIS data to find the characteristics of ships or channels in the area of research to establish a new model. It can be seen that the AIS data plays a fundamental and important role in the research of marine traffic engineering, especially in marine traffic flow
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