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Multicriteria analysis for flood risk map development: a hierarchical method applied to Brazilian cities

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Abstract

Floods have caused socio-economic and environmental damage globally and, thus, require research. Several factors influence flooding events, such as extreme rainfall, physical characteristics, and local anthropogenic factors; therefore, such factors are essential for mapping flood risk areas and enabling measures that mitigate the damage they cause. This study aimed to map and analyze regions susceptible to flood risk in three different study areas belonging to the same Atlantic Forest biome, in which flood disasters are recurrent. Due to the presence of numerous factors, a multicriteria analysis using the Analytical Hierarchical Process was conducted. First, a geospatial database was composed of layers of elevation, slope, drainage distance, soil drainage, soil hydrological group, precipitation, relief, and land use and cover. Flood risk maps for the study area were then generated, and patterns in the study areas were verified, with the greatest influence being exerted by intense precipitation on consecutive days, elevation at the edges of the channel with low altimetric variation and a flat combination, densely built areas close to the banks of the main river, and an expressive water mass in the main watercourse. The results demonstrate that these characteristics together can indicate the occurrence of flooding events.

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The data used are available on public consultation platforms and the software are free.

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Acknowledgements

The authors are grateful to the Conselho Nacional de Desenvolvimento Científico e Tecnológico – CNPq, to the Programa de Apoio à Pós-graduação – PROAP, and to the Federal University of Mato Grosso do Sul - UFMS for their support in the development of this work. This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001.

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Authors

Contributions

Sharon Kelly de Melo—conceptualization, methodology, software, validation, formal analysis, investigation, writing the original draft and review and editing, and visualization; Aleska Kaufmann Almeida—methodology, writing the original draft and review and editing, and visualization; Isabel Kaufmann de Almeida—conceptualization, methodology, validation, writing the original draft and review and editing, visualization, and supervision.

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Correspondence to Isabel Kaufmann de Almeida.

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The authors declare no competing interests.

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Responsible Editor: Philippe Garrigues

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de Melo, S.K., Almeida, A.K. & de Almeida, I.K. Multicriteria analysis for flood risk map development: a hierarchical method applied to Brazilian cities. Environ Sci Pollut Res 30, 80311–80334 (2023). https://doi.org/10.1007/s11356-023-27856-8

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  • DOI: https://doi.org/10.1007/s11356-023-27856-8

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