A quantitative method for the similarity assessment of typhoon tracks

Abstract

Typhoons are one of the most dangerous types of natural hazards; they are always developed in the western and southwestern Pacific Ocean and pose economic and human security threats to the Pacific Rim annually. Therefore, many scholars in related fields devote themselves to finding an effective way to analyze and forecast typhoon tracks to prevent disasters. Similarity analysis of typhoon tracks can provide great help for typhoon prediction. In this paper, a model for typhoon similarity analysis is proposed to effectively measure and quantify the similarity between two historical typhoon tracks based on the dynamic time warping (DTW) algorithm, in which five typhoon elements -namely, longitude, latitude, central pressure, expanded Beaufort scale, and movement speed -are integrated to derive a final similarity percentage indicating the similarity level. At the end of this paper, case studies concerning historical typhoons and the ongoing Typhoon 202106 In-Fa are also conducted to verify the validity and effectiveness of the proposed model. The results show that the proposed model can effectively provide a quantitative similarity of two typhoon tracks when functioning well on ongoing typhoons with a cutoff rule and supplying promising support for typhoon prediction simultaneously.

Quantitative Evaluation Method of Physical Fitness Factor Indicators in Youth Endurance Running Events

“…From the perspective of related research, endurance running is a complex exercise that integrates the human movement system, respiratory energy supply system, nervous system, and endocrine system, and these factors are closely related to the body [12,13]. Exploring the relationship between the physical fitness and long-distance running, and constructing a physical fitness index system for long-distance running, is extremely important for improving the level of long-distance running, and has a certain value for cultivating students [14].…”