Quantitative water balance of surface waters for a transboundary basin in South America

Gabriel Borges Santos (), Gilberto Loguercio Collares, Lukas Santos Boeira and Thais Magalhães Possa
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Gabriel Borges Santos: Federal University of Pelotas
Gilberto Loguercio Collares: Federal University of Pelotas
Lukas Santos Boeira: Federal University of Pelotas
Thais Magalhães Possa: Federal University of Rio Grande do Sul

Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, 2024, vol. 26, issue 8, No 106, 21755-21781

Abstract: Abstract The knowledge of factors that influence the waters present in the hydrographic basins is extremely important for efficient management, considering its multiple uses. In this regard, the present work aims to apply mathematical modeling tools, expressed by the HRI-Hydro Tools, the hydrological model of large basins and WARM-GIS Tools, to carry out the physical characterization, hydrological modeling, and the quantitative water balance, for the Jaguarão River hydrographic basin (JRhb). In two scenarios, monthly-based, the reference flow adopted was Q90. Further the water stress index (WSI) was applied for each section of the JRhb drainage network, with emphasis on the analysis of the influence of multiple uses of water in the basin, especially for irrigation. The water withdrawal index (WWI) was used to develop a diagnosis of the watershed level of scarcity, taking into account the annual water commitment, to improve the quantitative representation of water for the JRhb. The results of the hydrological modeling performed showed that, in general, the model presented a good performance both in the calibration and in the validation of the studied periods. The WSI representation showed that in the current scenario (realistic scenario) the basin has been suffering great water stress in the months that comprise the summer season (December, January, February, and March). In addition, the application of the WSI exposed the great influence of water use in the production of irrigated rice in this territory. This result was supported by WWI, which revealed sub-basins that were in a vulnerable state, requiring intensive management and major mitigation efforts. Graphical abstract

Keywords: Water resources; Hydrological modeling; Hydrical stress; MLB; WARM-GIS tools (search for similar items in EconPapers)
Date: 2024
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DOI: 10.1007/s10668-023-03430-7

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