부산대학교 도서관

A flash drought is a rapid-onset drought that develops over a short period of time as weather and environmental factors change rapidly, unlike generaldroughts, due to meteorological abnormalities. Abnormally high evapotranspiration rates and rapid declines in soil moisture increase vegetation stress. In addition, crop yields may decrease due to flash droughts during crop growth and may damage agricultural and economic ecosystems. In this study,Flash Drought Intensity Index (FDII) based on soil moisture data from Gravity Recovery Climate Experiment (GRACE) was used to analyze flashdrought. FDII, which is calculated using soil moisture percentile, is expressed by multiplying two factors: the rate of intensification and the droughtseverity. FDII was developed for domestic flash drought events from 2014 to 2018. The flash drought that occurred in 2018, Chungcheongbuk-doshowed the highest FDII. FDII was higher in heat wave flash drought than in precipitation deficit flash drought. The results of this study show thatFDII is reliable flash drought analysis tool and can be applied to quantitatively analyze the characteristics of flash drought in South Korea.