[A-AS04] Advances in Tropical Cyclone Research: Past, Present, and Future

[AAS04-P06] An Analysis of the Top 10 Property Damage Typhoon Cases through the Development of Korean Typhoon Type Index

*Woo-Sik Jung¹ (1.Department of Atmospheric Environment Information Engineering, INJE University.)

Keywords:Typhoon Type Index (TTI), Wind typhoon, Rain typhoon, WRN, Typhoon-Reday System (TRS)

Most of the damage caused by typhoons on the Korean Peninsula results from heavy rains and strong winds. Reducing typhoon damage requires timeous predictions of possible damage by these factors and detailed spatiotemporal distributions of the rain and wind accompanying typhoons on the Korean Peninsula. This preliminary study aimed to develop a Korean typhoon type index for use in actual disaster prevention by administrative bodies. Typhoon types were classified and their characteristics were analysed at a detailed regional level. The method of Lin et al. (2020) was applied to the typhoon type index used in this study, combined with precipitation and wind speed data from 1904 to 2021. The correlation was calculated between cumulative precipitation and strong winds recorded at one point over the duration of the typhoon impact period, a linear regression line was obtained, and the Korean Typhoon Type Index (KTTI) was calculated to classify rain and wind typhoons. Typhoons with a positive KTTI value were classified as "wind typhoons" that are associated with strong winds, while typhoons with a negative value were classified as "rain typhoons" that are more associated with rain. A higher positive KTTI value indicates a greater influence of wind on the risk factor, and a more negative KTTI level indicates a greater influence of rain.
The results of this preliminary study show that rain- and wind-accompanied typhoons affecting the Korean Peninsula do not have uniform effects and characteristics throughout the region. For the same wind speed or precipitation level, different ranges and characteristics of influence were found for each factor. Therefore, based on the results of this study, more useful tools and information, related to the impact of typhoons on the Korean Peninsula, can be derived from more specific and diverse TTI analyses, conducted for the entire typhoon period and incorporating modern weather observations across the Korean Peninsula.

This work was supported by the National Research Foundation of Korea(NRF) grant funded by the Korea government(MSIT) (No. 2020R1F1A1068738)