Abstract
In this study, a method for dynamically establishing ship domain in inland waters is proposed to help make decisions about ship collision avoidance. The surrounding waters of the target ship are divided to grids and then calculating the grid densities of ships in each moment to determine the shape and size of ship domain of different types of ships. At last, based on the spatiotemporal statistical method, the characteristics of ship domains of different types of ship in different navigational environments were analyzed. The proposed method is applied to establish ship domains of different types of ship in Wuhan section of the Yangtze River in January, February, July, and August in 2014. The results show that the size of ship domain increases as the ship size increases in each month. The domain size is significantly influenced by the water level, and the ship domain size in dry seasons is larger than in the wet seasons of inland waters.
Highlights
Eng. 2021, 9, 410. https://doi.org/With the vigorous development of the shipping industry in the inland waters of China, the navigational risk of ships has increased obviously
Some researchers explored the relationships between the ship domain size and ship attributes and developed different kinds of ship domain model to satisfy different application scenes, i.e., the elliptical ship domain model [7,8], the unequal sector model [1], and the circular ship domain model [9,10]
The ellipse ship domain model was proposed to analyze the impacts of the International Regulations for Preventing Collisions at Sea, and this model was utilized in various scenarios [1]
Summary
With the vigorous development of the shipping industry in the inland waters of China, the navigational risk of ships has increased obviously. The marine radar data were utilized to statistically analyze the navigational regulations and establish ship domains in previous studies [9,11]. With the time and the navigation position change, the navigational environments and the characteristics of the ship traffic flow are constantly changing in the inland waters. The navigational environments of inland waters, the attributes of inland ships, and the navigating characteristics of inland ships are considered to propose a spatiotemporal statistical method of establishing the inland ship domain. The proposed method was utilized to establish ship domains of different types of ships here in 2014 and to analyze the characteristics of ship domains of inland waters.
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