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Development of a drought vulnerability index using MCDM and GIS: study case in São Paulo and Ceará, Brazil

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Abstract

Although climate change vulnerability research in general has increased over the last decade, Latin American countries have more directed more limited efforts toward vulnerability and its social aspects. To respond to this gap, the authors developed a method to quantify drought vulnerability, which is key climate risk in Brazil. The iSECA model uses MCDM techniques to calculate vulnerability indexes by applying weighting schemes to indicators that represent climatological, social, economic, and water management factors. GIS software was used to classify and to map vulnerability. The model output is a drought vulnerability index, displayed through maps and graphs, including a vulnerability triangle and frequency curves. The results provide a clear understanding for water managers and non-specialists and can serve as an indispensable tool for water management in drought-prone regions. A sensitivity analysis confirms the model's robustness. iSECA was applied to Ceará and São Paulo, two states with distinct climatological and socio-economic contexts. The application demonstrated how the model works well across different spatial scales within these different contexts. The study found that in São Paulo more than 30 million people are living with very high vulnerability to drought primarily due to water management characteristics. However, in Fortaleza, Ceará, the climatic factors are the most critical. Even the state’s robust interbasin water infrastructure system does not significantly reduce the drought risk. The ability to identify vulnerability hotspots and the underlying characteristics that influence the rankings provides the necessary input of policy decisions.

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Fig. 6 Sensitivity analysis: amplitude for a data variation of 20%

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Acknowledgements

This study was financed in part by the Conselho Nacional de Desenvolvimento Científico e Tecnológico—Brasil (CNPq) and the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES) (Grant No. 446222/2015-1).

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Authors and Affiliations

  1. Department of Hydraulic and Environmental Engineering, Federal University of Ceará, Fortaleza, Ceará, Brazil

    Gabriela de Azevedo Reis, Francisco Assis de Souza Filho, Renan Vieira Rocha & Samiria Maria Oliveira da Silva

  2. Department of Anthropology, University of Georgia, Athens, GA, USA

    Donald Robert Nelson

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  1. Gabriela de Azevedo Reis
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  2. Francisco Assis de Souza Filho
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  3. Donald Robert Nelson
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  4. Renan Vieira Rocha
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  5. Samiria Maria Oliveira da Silva
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Correspondence to Gabriela de Azevedo Reis.

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de Azevedo Reis, G., de Souza Filho, F.A., Nelson, D.R. et al. Development of a drought vulnerability index using MCDM and GIS: study case in São Paulo and Ceará, Brazil. Nat Hazards 104, 1781–1799 (2020). https://doi.org/10.1007/s11069-020-04247-7

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