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Assessment of regional drought vulnerability and risk using principal component analysis and a Gaussian mixture model

Author

Listed:
  • Ji Eun Kim

    (Hanyang University)

  • Jisoo Yu

    (K-water)

  • Jae-Hee Ryu

    (Hanyang University)

  • Joo-Heon Lee

    (Joongbu University)

  • Tae-Woong Kim

    (Hanyang University)

Abstract

Due to the complex characteristics of drought, drought risk needs to be quantified by combining drought vulnerability and drought hazard. Recently, the major focus in drought vulnerability has been on how to calculate the weights of indicators to comprehensively quantify drought risk. In this study, principal component analysis (PCA), a Gaussian mixture model (GMM), and the equal-weighting method (EWM) were applied to objectively determine the weights for drought vulnerability assessment in Chungcheong Province, located in the west-central part of South Korea. The PCA provided larger weights for agricultural and industrial factors, whereas the GMM computed larger weights for agricultural factors than did the EWM. The drought risk was assessed by combining the drought vulnerability index (DVI) and the drought hazard index (DHI). Based on the DVI, the most vulnerable region was CCN9 in the northwestern part of the province, whereas the most drought-prone region based on the DHI was CCN12 in the southwest. Considering both DVI and DHI, the regions with the highest risk were CCN12 and CCN10 in the southern part of the province. Using the proposed PCA and GMM, we validated drought vulnerability using objective weighting methods and assessed comprehensive drought risk considering both meteorological hazard and socioeconomic vulnerability.

Suggested Citation

  • Ji Eun Kim & Jisoo Yu & Jae-Hee Ryu & Joo-Heon Lee & Tae-Woong Kim, 2021. "Assessment of regional drought vulnerability and risk using principal component analysis and a Gaussian mixture model," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 109(1), pages 707-724, October.
    • Handle: RePEc:spr:nathaz:v:109:y:2021:i:1:d:10.1007_s11069-021-04854-y
    DOI: 10.1007/s11069-021-04854-y
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