Assessment Of Water Supply Stability For Drought-Vulnerable Boryeong Multipurpose Dam In South Korea Using Future Dry Climate Change Scenarios

This study assessed the water supply stability for Boryeong multipurpose dam by applying future dry climate change scenarios and Soil and Water Assessment Tool (SWAT). CMCC-CM, INM-CM4, and IPSL-CM5A-MR RCP 4.5 and 8.5 scenarios were selected as the future dry conditions using Runs theory and Standardized Precipitation Index (SPI). For historical (1980-1999), present (2000-2019), and future periods (2030s, 2050s, 2070s, and 2090s) of the 6 scenarios, SWAT model was used to simulate the future dam water supply stability. The stability was evaluated in terms of reliability (R-T), resilience (R-S), and vulnerability (V) based on the monthly target storage. The results showed that the future R-T can be decreased to 0.803 in 2050s IPSL-CM5A-MR RCP 8.5 scenario from present 0.955. The future R-S and V showed the minimum value of 0.003 and the biggest value of 3567.6 x 10(6) m(3) in 2070s IPSL-CM5A-MR RCP 4.5 scenario. The future R-T, R-S, and V showed that the dam has low resilience and is vulnerable to future drought scenarios.