How Changes in Future Precipitation Impact Flood Frequencies: A Quantile‐Quantile Mapping Approach

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Publicado no:Water Resources Research vol. 61, no. 7 (Jul 1, 2025)
Autor principal: Cafiero, Luigi
Outros Autores: Bertola, Miriam, Mazzoglio, Paola, Blöschl, Günter, Laio, Francesco, Viglione, Alberto
Publicado em:
John Wiley & Sons, Inc.
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024 7 |a 10.1029/2024WR038471  |2 doi 
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100 1 |a Cafiero, Luigi  |u Dipartimento di Ingegneria dell’Ambiente, del Territorio e delle Infrastrutture, Politecnico di Torino, Turin, Italy 
245 1 |a How Changes in Future Precipitation Impact Flood Frequencies: A Quantile‐Quantile Mapping Approach 
260 |b John Wiley & Sons, Inc.  |c Jul 1, 2025 
513 |a Journal Article 
520 3 |a Flood risk management institutions and practitioners need reliable and easy‐to‐use approaches that incorporate the changing climate conditions into flood predictions in ungauged basins. The present work aims at developing an operative procedure to include the expected variation in precipitation extremes in flood frequency analysis. We relate Flood Frequency Curves (FFC) and Intensity‐Duration‐Frequency curves through quantile‐quantile relationships, whose slopes represent the elasticity of floods to precipitation extremes. Assuming that the percentage variations of precipitation and flood quantiles are linked by the quantile‐quantile relationship, we obtain modified FFC accounting for the projected changes in precipitation extremes. The methodology is validated in a virtual world inspired by the Rational Formula approach, where flood events are the result of the combination of two jointly distributed random variables: extreme precipitation and peak runoff coefficient. The proposed methodology is found to be reliable for large return periods in basins where flood changes are dominated by precipitation changes rather than variations in the runoff generation process. To illustrate its practical usefulness, the procedure is applied to 227 catchments within the Po River basin in Italy using projected percentage changes of precipitation extremes from CMIP5 CORDEX simulations for the end of the century (2071–2100) and RCP 8.5 scenario. With projected changes in 100‐year precipitation ranging from 5% to 50%, the corresponding variations in 100‐year flood magnitudes are expected to span a broader range (10%–90%). A substantial heterogeneity in catchment responses to rainfall changes exists due to different elasticities of floods to precipitation extremes. 
653 |a River basins 
653 |a Extreme weather 
653 |a Watersheds 
653 |a Flood frequency 
653 |a Quantiles 
653 |a Future precipitation 
653 |a Risk management 
653 |a Runoff 
653 |a Flood risk 
653 |a Floods 
653 |a Precipitation 
653 |a Heterogeneity 
653 |a Climate change 
653 |a Flood forecasting 
653 |a Elasticity 
653 |a Random variables 
653 |a Variation 
653 |a Flood frequency analysis 
653 |a Runoff coefficient 
653 |a Climatic conditions 
653 |a River discharge 
653 |a Frequency analysis 
653 |a Flood predictions 
653 |a Catchments 
653 |a Flood management 
653 |a Rainfall 
653 |a Environmental risk 
653 |a Precipitation variations 
653 |a Climate prediction 
653 |a Environmental 
700 1 |a Bertola, Miriam  |u Institute of Hydraulic Engineering and Water Resources Management, Vienna University of Technology, Vienna, Austria 
700 1 |a Mazzoglio, Paola  |u Dipartimento di Ingegneria dell’Ambiente, del Territorio e delle Infrastrutture, Politecnico di Torino, Turin, Italy 
700 1 |a Blöschl, Günter  |u Institute of Hydraulic Engineering and Water Resources Management, Vienna University of Technology, Vienna, Austria 
700 1 |a Laio, Francesco  |u Dipartimento di Ingegneria dell’Ambiente, del Territorio e delle Infrastrutture, Politecnico di Torino, Turin, Italy 
700 1 |a Viglione, Alberto  |u Dipartimento di Ingegneria dell’Ambiente, del Territorio e delle Infrastrutture, Politecnico di Torino, Turin, Italy 
773 0 |t Water Resources Research  |g vol. 61, no. 7 (Jul 1, 2025) 
786 0 |d ProQuest  |t ABI/INFORM Global 
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