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Analysis of the response of the Epitácio Pessoa reservoir (Brazilian semiarid region) to potential future drought, water transfer and LULC scenarios

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Abstract

The Brazilian semiarid region (BSAR) is affected by the high precipitation variability and severe drought events over time, promoting recurrent water scarcity. The water supply in the BSAR has suffered since 2012 from severe incidents of rainfall reduction, creating a complex scenario of water scarcity, for instance, in Campina Grande city, which is supplied by the Epitácio Pessoa reservoir (EPR). This study analyzed the future impacts on the volume of the EPR based on potential future droughts, water transfer from the São Francisco River, population growth and recent changes in land use and land cover (LULC). Several procedures were performed, including (a) simulation of LULC scenarios with the LCM algorithm, (b) simulation of future rainfall scenarios for the period from 2020 to 2030, (c) streamflow simulation using the Soil Water and Assessment Tool (SWAT) model and (d) prediction of water storage in the EPR for the period from 2020 to 2030 using three rainfall scenarios (− 40%, − 45% and − 50%). The results indicated that the SWAT calibration and validation results were considered satisfactory based on the R2, Nash, and PBIAS values. The results were assumed from the rainfall scenarios for the period from 2020 to 2030 together with the LULC scenario for 2030, including the estimated outflow of water transfer from the São Francisco River. The results showed, based on the three adopted rainfall scenarios, that the reservoir would reach its critical volume in the first two years of the analyzed period, and the reservoir volume would then increase until 2024 and subsequently return to decrease, reaching the critical volume in 2030.

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The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Funding

This study was financed in part by the Brazilian Federal Agency for the Support and Evaluation of Graduate Education (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—CAPES)—Fund Code 001, the National Council for Scientific and Technological Development, Brazil—CNPq (Grant Nos. 304213/2017-9 and 304540/2017-0) and the Federal University of Paraíba.

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JFCBCS and RMS designed the research; JFCBCS, RMS and CAGS wrote the original draft; AMS, PCGV, RMS and CAGS performed the manuscript review and editing; CAGS and RMS provided funding acquisition, project administration and resources; and RMS, CAGS, JFCBCS, AMS and PCGV wrote the final paper.

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Correspondence to Celso Augusto Guimarães Santos.

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The authors declare that they have no competing interests.

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Silva, J.F.C.B.d., da Silva, R.M., Santos, C.A.G. et al. Analysis of the response of the Epitácio Pessoa reservoir (Brazilian semiarid region) to potential future drought, water transfer and LULC scenarios. Nat Hazards 108, 1347–1371 (2021). https://doi.org/10.1007/s11069-021-04736-3

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  • DOI: https://doi.org/10.1007/s11069-021-04736-3

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