1.College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China; 2.Key Laboratory of East China Sea Fishery Resources Exploitation & Utilization, Ministry of Agriculture and Rural Affairs， East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200090， China; 3.Key Laboratory of Sustainable Utilization of Technology Research for Fishery Resource of Zhejiang Province, Marine Fisheries Research Institute of Zhejiang, Zhoushan 316021, China
Abstract: The spatial relationship among port grid, shoreline point and trip was analyzed by the data recorded by Beidou shipboard terminal through trip feature data mining the information on time, position, speed and direction of fishing vessels by 399.8 thousand trip data of more than 25 000 fishing vessels in order to strengthen the management of fishing vessel entering and leaving ports and the supervision of fishing catch, and to solve the problems of subjectivity in information reporting, such as reporting information error and false report. The voyage characteristics of Chinese offshore fishing vessels were analyzed using the spherical distance summation of ship positions to calculate the voyage, and the distance from ship position points to shoreline points to calculate the average offshore distance. The results showed that the departure time was changed from 8:00 to 17:59 every day, and the arrival time from 5:00 to 10:59 and from 13:00 to 18:59 every day. The characteristic data of trip was greatly affected by the spring and autumn tide and the sun, which can be divided into 4 periods including 1-10 days, 11-15 days, 16-21 days and 22-30 days. The trip duration, trip length and average off shore distance of fishing vessels were decreased from Jiangsu Province towards the north and south. The finding shows that it is fast and real-time to extract the trip number by using the Beidou position data, which is one of the important information sources of fishing vessel management, and can provide reference for the management of fishing vessel entering and leaving ports.
2021, Vol. 36 
