A Study on the Time-Periodic Characteristics of Changes in Typhoon Activities and Typhoon-Induced Rainfall over the Korean Peninsula

This study classified the typhoons that hit the Korean Peninsula in the past depending on the period and wind velocity, and analyzed the features of typhoon activities (maximum wind speed, minimum central pressure, occurrence frequency, genesis position, recurving position, and passage frequency) and variability and tendency of rainfall arising from the typhoon.The results of the analysis showed that compared with the typhoons that formed during Period 1 (1977)(1978)(1979)(1980)(1981)(1982)(1983)(1984)(1985)(1986)(1987)(1988)(1989)(1990)(1991)(1992)(1993)(1994), the typhoons that formed during Period 2 (1995-2012) had stronger maximum wind velocities and lower minimum central pressures.It was revealed that on average, the relatively strong typhoons (wind speed of more than 95 kt) formed further west in Period 2 compared with those in Period 1, and the recurving positions of the typhoons were further north in Period 2 compared with those in Period 1; accordingly, the more recent relatively strong typhoons more directly affected the Korean Peninsula.The results of the analysis showed that hourly maximum rainfall and total rainfall arising from the typhoon were more widespread over the Korean Peninsula in Period 2 than in Period 1; in particular, the gap was wider in the southern region than in any other regions.The findings are expected to be used later as the basic data in drawing up a plan to positively utilize typhoons, such as by securing water resources and minimizing the damage from typhoons.