Abstract
The Intergovernmental Panel on Climate Change (IPCC) assessed with medium confidence that there has been an anthropogenic influence in the intensification of heavy rainfall at the global scale. Nevertheless, when taking into account gauge-based evidence, no clear climate-driven global change in the magnitude or frequency of floods has been identified in recent decades. This paper follows up on a previous nonstationary flood frequency analysis in the Itajaí River, which is located in the Southeastern South America region, where evidence of significant and complex relationships between El Niño-Southern Oscillation (ENSO) and hydrometeorological extremes has been found. The identified climate-flood link is further explored using sea surface temperature (SST) output from CMIP5 models under different representative concentration pathway (RCP) scenarios. Results are inconclusive as to whether it is possible to make a statement on scenario-forced climate change impacts on the flood regime of the Itajaí river basin. The overall outcome of the analysis is that, given that sample sizes are adequate, stationary models seem to be sufficiently robust for engineering design as they describe the variability of the hydrological processes over a large period, even if annual flood probabilities exhibit a strong year-to-year dependence on ENSO.
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Acknowledgments
A previous shorter version of the paper (Silva et al. 2017a) has been presented in the 10th World Congress of EWRA “Panta Rhei” Athens, Greece, 5–9 July 2017. The authors thank the guest editor and two anonymous reviewers for their valuable comments and suggestions.
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Silva, A.T., Portela, M.M. Using Climate-Flood Links and CMIP5 Projections to Assess Flood Design Levels Under Climate Change Scenarios: A Case Study in Southern Brazil. Water Resour Manage 32, 4879–4893 (2018). https://doi.org/10.1007/s11269-018-2058-6
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DOI: https://doi.org/10.1007/s11269-018-2058-6