Development and Application of Drought Index Based on Accumulative Pattern of Daily Rainfall

일 단위 강수량의 누적 패턴을 이용한 가뭄지수 개발 및 적용

  • Received : 2015.10.10
  • Accepted : 2015.11.17
  • Published : 2016.01.31


This study proposed a new drought index considering the accumulative pattern of daily rainfall, i.e., Rainfall Accumulation Drought Index (RADI). The RADI can be easily calculated at daily scale by comparing the long-term averaged cumulative rainfall to the observed cumulative rainfall for a specific duration. This study evaluated the availability of the RADI in the field of monitoring short-term and long-term droughts by investigating the spatial and temporal variability and the recurrence cycle of drought in South Korea. To present the short-term and long-term droughts, the various SPIs with different durations should be used in practice. However, the RADI can present and monitor both short-term and long-term droughts as a single index. By investigating the national average of the RADI, specific drought patterns of 20-year cycle were identified in this study. This study also proposed a five-level drought classification considering occurrence probability that would be a suitable alternative as a drought criterion for drought forecast/response.


accumulative pattern;daily rainfall;drought index


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Supported by : 한국연구재단, 국토교통부