Abstract:
Extreme weather caused by typhoons poses significant threats to the lives and property of inland city residents. Therefore, studying the landing characteristics of typhoons affecting inland cities has become increasingly important.The China Meteorological Administration (CMA) tropical cyclone best track data and ground observation data from 1959 to 2023 were used to analyze the landing characteristics of typhoons affecting Hefei Area.Based on wind-rain impact differences,the typhoons were divided into three categories: typhoons with only high rainfall (OP), typhoons with only strong winds (OW), and typhoons with severe wind and rain (PW).The results show that: (1) Over 65 years, 89 typhoons affected Hefei, with OP, OW, and PW accounting for 17%, 20%, and 8% respectively, totaling 45%, highlighting the importance of high-impact typhoons; (2) Temporally, typhoon activity showed phased changes, with active periods from the 1980s to 1990s and after 2016. Before 2000, OW was predominant, while OP increased significantly afterward, with PW recurrence intervals of 10-20 years. Seasonally, July to September is a period of concentrated influence (with an increase in PW frequency from August to September); (3) In terms of landing characteristics, Fujian was the most frequent landing province (31.2%); 43.7% of typhoons underwent secondary landfalls, with 94% first making landfall in Taiwan before striking Fujian and Zhejiang. Landing intensity was mainly typhoon level, but OW strength was generally weaker than OP; (4) In movement paths, 48% followed the Type IV path (turning south of 30°N), while the secondary dominant paths for OP / PW and OW were Type II (northwest) and Type III (northward turning). Significantly, Jiangxi Province and the Jiangsu-Zhejiang-Anhui border region were key transitional zones for high-impact typhoon paths, corresponding to the main influence channels for OP and OW. The research results provide data support for the assessment of typhoon disaster risks and the formulation of defense strategies in Hefei.