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Recent climate change is causing changes in temperature and rainfall patterns. The frequency of droughts has also steadily increased gradually strengthening the possibility of a Black Swan-type drought; as such, it is necessary to establish a customized response. Such a drought would not just be a disaster, but also a complex natural disaster that could have a direct and indirect impact on society as a whole. Therefore, we consider the definition of extreme drought through analyses of domestic and international literature and propose a methodology to quantitatively determine a domestic definition of extreme drought. Taking advantage of the cumulative Standard Precipitation Index (SPI) index and drought period of a nation's major drought areas, an envelope curve was created to propose a quantitative definition method. In the future, it is expected that the definition of this study will be used as basic data for establishing response criteria based on the scenario of extreme drought.

Application of Envelope Curve Method for Quantitative Definition of Extreme Drought Conditions