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Nat. Hazards Earth Syst. Sci., 15, 2347-2358, 2015
https://doi.org/10.5194/nhess-15-2347-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
15 Oct 2015
High-resolution analysis of 1 day extreme precipitation in Sicily
M. Maugeri1,2, M. Brunetti2, M. Garzoglio1, and C. Simolo2 1Department of Physics, Università degli Studi di Milano, Milan, Italy
2Institute of Atmospheric Sciences and Climate, CNR, Bologna, Italy
Abstract. Sicily, a major Mediterranean island, has experienced several exceptional precipitation episodes and floods during the last century, with serious damage to human life and the environment. Long-term, rational planning of urban development is indispensable to protect the population and to avoid huge economic losses in the future. This requires a thorough knowledge of the distributional features of extreme precipitation over the complex territory of Sicily. In this study, we perform a detailed investigation of observed 1 day precipitation extremes and their frequency distribution, based on a dense data set of high-quality, homogenized station records in 1921–2005. We estimate very high quantiles (return levels) corresponding to 10-, 50- and 100-year return periods, as predicted by a generalized extreme value distribution. Return level estimates are produced on a regular high-resolution grid (30 arcsec) using a variant of regional frequency analysis combined with regression techniques. Results clearly reflect the complexity of this region, and show the high vulnerability of its eastern and northeastern parts as those prone to the most intense and potentially damaging events.

Citation: Maugeri, M., Brunetti, M., Garzoglio, M., and Simolo, C.: High-resolution analysis of 1 day extreme precipitation in Sicily, Nat. Hazards Earth Syst. Sci., 15, 2347-2358, https://doi.org/10.5194/nhess-15-2347-2015, 2015.
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Short summary
We investigate 1-day precipitation extremes in Sicily and their frequency distribution, based on a dense data set of high-quality, homogenized station records (1921-2005). Return levels corresponding to 10-, 50- and 100-year periods are produced on a high-resolution grid using a variant of regional frequency analysis combined with regression techniques. The results, which clearly reflect the complexity of this region, may be useful in the context of extreme precipitation risk assessment.
We investigate 1-day precipitation extremes in Sicily and their frequency distribution, based on...
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