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Theoretical and Applied Climatology

, Volume 113, Issue 1–2, pp 1–15 | Cite as

The climatic characteristics of extreme precipitations for short-term intervals in the watershed of Lake Maggiore

  • Helmi SaidiEmail author
  • Marzia Ciampittiello
  • Claudia Dresti
  • Giorgio Ghiglieri
Original Paper

Abstract

Alpine and Mediterranean areas are undergoing a profound change in the typology and distribution of rainfall. In particular, there has been an increase in consecutive non-rainy days, and an escalation of extreme rainy events. The climatic characteristic of extreme precipitations over short-term intervals is an object of study in the watershed of Lake Maggiore, the second largest freshwater basin in Italy (located in the north-west of the country) and an important resource for tourism, fishing and commercial flower growing. The historical extreme rainfall series with high-resolution from 5 to 45 min and above: 1, 2, 3, 6, 12 and 24 h collected at different gauges located at representative sites in the watershed of Lake Maggiore, have been computed to perform regional frequency analysis of annual maxima precipitation based on the L-moments approach, and to produce growth curves for different return-period rainfall events. Because of different rainfall-generating mechanisms in the watershed of Lake Maggiore such as elevation, no single parent distribution could be found for the entire study area. This paper concerns an investigation designed to give a first view of the temporal change and evolution of annual maxima precipitation, focusing particularly on both heavy and extreme events recorded at time intervals ranging from few minutes to 24 h and also to create and develop an extreme storm precipitation database, starting from historical sub-daily precipitation series distributed over the territory. There have been two-part changes in extreme rainfall events occurrence in the last 23 years from 1987 to 2009. Little change is observed in 720 min and 24-h precipitations, but the change seen in 5, 10, 15, 20, 30, 45, 60, 120, 180 and 360 min events is significant. In fact, during the 2000s, growth curves have flattened and annual maxima have decreased.

Keywords

Annual Maximum Homogeneous Region Generalise Extreme Value Extreme Rainfall Regional Frequency Analysis 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This study was carried out as part of the Strategie di Adattamento al Cambiamento Climatico (STRADA) project, funded under the Cross-Border Cooperation Programme INTERREG 2007–2013 Italy–Switzerland. We are grateful to the anonymous reviewers whose suggestions allowed us to improve the presentation of our results. We would like to thank Mrs. Sandra Spence for the careful language revision of the manuscript.

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Helmi Saidi
    • 1
    Email author
  • Marzia Ciampittiello
    • 1
  • Claudia Dresti
    • 1
  • Giorgio Ghiglieri
    • 2
    • 3
  1. 1.The National Research Council—Institute of Ecosystem StudyVerbaniaItaly
  2. 2.Department of Earth ScienceCagliari UniversityCagliariItaly
  3. 3.Desertification Research Group (NRD)Sassari UniversitySassariItaly

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