Author(s): Dong-Hyeon Kim; Young-Jun Kim; Sang-Hyeok Park; Seo-Yeon Park
Linked Author(s):
Keywords: Drought propagation; Drought-to-impact; Hydrological drought; Water source vulnerability
Abstract: Irregularities in the temporal and spatial distribution of precipitation have increased the frequency and intensity of floods and droughts. Droughts are difficult to detect at an early stage, and their severity becomes evident only after impacts accumulate. Prolonged droughts lead to reduced river discharge and declining reservoir levels, resulting in water shortages and affecting hydrological and social systems as a whole. Substantial impacts arise that necessitate emergency water supply measures in different regions. This study quantitatively analyzes the relationship between antecedent droughts and drought impacts and compares drought characteristics by water source. Drought severity, magnitude, and duration for major water sources (e.g., dams and rivers) were compared with impact-lag days to assess water source-specific vulnerability. This study quantitatively presents the relationship between the persistence and magnitude of antecedent droughts and the resulting drought impacts, suggesting its applicability as fundamental data for establishing region-specific drought response and water resources management strategies.
Year: 2026