Analyse de la sécheresse hydrologique en milieu continental tempéré et en milieu méditerranéen en Italie, pendant la période 1981-2010

Analysis of hydrological drought in continental temperate and Mediterranean environment during the period 1981-2010. A thirty-year (1981-2010) study of the hydrological drought trend is realised in two Italian regions, Piedmont and Sardinia, with different climatic features (Temperate continental climate and Mediterranean climate). For this purpose, we have examined the daily data of 13 meteorological stations uniformly installed in the two areas, and the trends of the SPI (Standardized Precipitation Index) and SPEI (Standardized Precipitation Evapotranspiration Index) have been also evaluated. The similarities and differences between the indices of the two Regions were then considered. In most stations of both zones, there is a statistically significant trend with an increase in the SPI index and a decrease in the SPEI index. Nevertheless, the mean values trend of the two indices is not significant in any of the two environmental areas considered.