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Uncertainty reduction in flood areas by probabilistic analyses of land use/cover in models of two-dimensional hydrodynamic model of dam-break

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Abstract

The estimation of the flood area inaccuracies by the propagation of Manning’s coefficient uncertainty is crucial for safety plans of dam-breaks. However, the probabilistic studies of fluvial inundation concentrate on the 1D models, and those that address to evaluate the variable floodplain roughness based on the land cover are deterministic approaches. Thus, this study proposed to analyze the propagation of Manning's coefficient uncertainty, whose variation was obtained by (1) floodplain land use; (2) Monte Carlo method considering different distributions, in a 2D model for Três Maria's dam (Brazil). The results indicated: (1) the distributed coefficient reduced by 9% the flood area from deterministic scenarios with the fixed coefficient; (2) the normal distribution created higher variability in analyzed parameters than a uniform distribution, although we found no significant difference between the distributions. The understanding of input variables in 2D models may contribute to the management of dam failure risk.

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Data availability statement

All simulation cases and scripts that support the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgements

The authors are grateful to the Centro Federal de Educação Tecnológica de Minas Gerais (CEFET-MG) for supporting the student scholarships of I.M.A., the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Brazil (CAPES) for student scholarships of I.M.A., and the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPQ) through the Projeto Universal (456390/2014-6). This study was also partly funded by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Brazil (CAPES), Finance Code 001. The authors are grateful to the staffers of Gabriel L. Paula and Carlos Coelho for support in the computational simulations.

Funding

The funding was provided by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Grant Nos. 001, 001), Centro Federal de Educação Tecnológica de Minas Gerais, Conselho Nacional de Desenvolvimento Científico e Tecnológico (Grant No. 456390/2014-6).

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I. M. A: Conceptualization, Investigation, Methodology, Results from analyses, Writing original draft. H. A. S.: Conceptualization, Investigation, Methodology, Results from analyses, Writing original draft, Writing review & editing. O. V. C.: Investigation, Methodology, Results from analyses, Writing review & editing. V. B. G.: Results from analyses, Writing review & editing.

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Correspondence to Hersilia Andrade Santos.

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Almeida, I.M., Santos, H.A., de Vasconcelos Costa, O. et al. Uncertainty reduction in flood areas by probabilistic analyses of land use/cover in models of two-dimensional hydrodynamic model of dam-break. Stoch Environ Res Risk Assess 38, 1335–1350 (2024). https://doi.org/10.1007/s00477-023-02635-6

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