Abstract
Abstract Prediction of drought is important for efficient water management, as the occurrence of droughts affects large areas over a long period. According to various climate change scenarios, it is reported that in the future, Korea's climate is likely to increase in temperature with increasing rainfall. This increase in temperature will have a big impact on evapotranspiration. The occurrence of drought begins mainly with two causes: lack of rainfall or an increase in evapotranspiration. Therefore, in this study, the impact of climate change on future droughts is revealed through the Standardized Precipitation Index (SPI) and the Evaporative Demand Drought Index (EDDI). These two drought indices with different characteristics are used to examine the trend of future drought, and a drought Severity-Duration-Frequency (SDF) curve was derived to quantitatively analyze the depth of future drought. Future droughts are projected by applying future climate data generated from various climate models.
Highlights
The increase in temperature due to climate change is expected to increase severity and frequency of drought
Drought index time series and future trends. Drought indices such as Standardized Precipitation Index (SPI) and Evaporative Demand Drought Index (EDDI) can be estimated using a variety of time scales, and only by selecting a time scale that reflects the hydrologic climatic characteristics of the region can they well represent the droughts in that region
Climate change scenarios mainly project increases in precipitation, so precipitationdependent SPIs tend to result in lessening future droughts
Summary
The increase in temperature due to climate change is expected to increase severity and frequency of drought. As the temperature has risen, the frequency of droughts in Korea occurred 0.36 times per year by 2000, while it has increased. The occurrence of droughts begins with changes in climate variables such as lack of precipitation and increased evapotranspiration. Such a condition is defined as a meteorological drought. Drought is caused by natural phenomena such as changes in precipitation and evapotranspiration, and has a great impact on society both economically and environmentally
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