| Title | The climatic characteristics of extreme precipitations for short-term intervals in the watershed of Lake Maggiore |
| 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. |
| Source | Theoretical and applied climatology 113 (1-2), pp. 1–15 |
| Keywords | Extreme rain eventsRegional frequency analysisL-momentsLake Maggiore |
| Journal | Theoretical and applied climatology |
| Editor | Springer, New York, Austria |
| Year | 2013 |
| Type | Articolo in rivista |
| DOI | 10.1007/s00704-012-0768-x |
| Authors | Helmi Saidi; Marzia Ciampittiello; Claudia Dresti; Giorgio Ghiglieri |
| Text | 282382 2013 10.1007/s00704 012 0768 x ISI Web of Science WOS 000320890700001 Extreme rain events Regional frequency analysis L moments Lake Maggiore The climatic characteristics of extreme precipitations for short term intervals in the watershed of Lake Maggiore Helmi Saidi; Marzia Ciampittiello; Claudia Dresti; Giorgio Ghiglieri Helmi Saidi; Marzia Ciampittiello; Claudia Dresti CNR ISE VB Giorgio Ghiglieri University of Cagliari; University of Sassari 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. 113 Published version Articolo Theor_Appl_Climatol_113_1_15.pdf Articolo in rivista Springer 0177 798X Theoretical and applied climatology Theoretical and applied climatology Theor. appl. climatol. Theoretical and applied climatology. Theoretical and applied climatology Print claudia.dresti DRESTI CLAUDIA helmi.saidi SAIDI HELMI marzia.ciampittiello CIAMPITTIELLO MARZIA TA.P02.014.002 Impatto dei cambiamenti globali sugli ecosistemi acquatici |
