Annual maximum rainfall intensity for several duration and return periods has been analyzed according to the Gumbel distribution. The Intensity-Duration-Frequency (IDF) curves before and after 1980 have been computed and compared. For the city of Toronto, it is shown that the rainfall intensities after 1980 are lower than those from before this date. This is especially clear for those of short duration. Comparing our results with those of other authors, it appears that, for the moment, no general law on the impact of global warming on the curves intensity duration frequency cannot be made. It appears that the impact of global warming on rainfall varies with geographic location and that it is not possible to draw some general conclusions across the planet.
Rizwan, M. and Tae-Woong, K. (2013) Application of a Mixed Gumbel Distribution to Construct Rainfall Depth-Duration-Frequency (DDF) Curves Considering Outlier Effect in Hydrologic Data. Journal of Environmental Science, Toxicology and Food Technology, 6, 54-60.
Solaiman, T.A. and Simonovic, S.P. (2011) Development of Probability Based Intensity-Duration-Frequency Curves under Climate Change. Water Resources Research Report, The University of Western Ontario, 93 p.
Fallot, J.M. and Hertig, J.A. (2013) Détermination des precipitations extremes en Suisse à l’aide d’analyses statistiques et augmentation des valeurs extrêmes durant le 20 ème siècle. Mémoires de la Société Vaudoise des Sciences Naturelles, 25, 23-34.