drought monitoring and early warning system in Iran. To overcome this obstacle, we have evaluated the applicability of GPCC … and NCEP/NCAR precipitation datasets for drought analysis in Iran. For this purpose, drought variability across the … and NCEP/NCAR datasets identify the same sub-regions of drought variability and they are in good agreement with …

An analysis of drought in western Iran from 1966 to 2000 is presented using monthly precipitation data observed at 140 … gauges uniformly distributed over the area. Drought conditions have been assessed by means of the Standardized Precipitation … Index (SPI). To study the long-term drought variability the principal component analysis was applied to the SPI field …

sets (NCEP/NCAR and ERA-40) on the assessment of drought variability are analysed. Particular attention has been devoted to … the analysis of the possible existence of a linear trend in the climatic signal. The long-term aspects of drought over the … analyses carried out with the two data sets, we studied the leading space-time variability of drought by applying the principal …

This study aims to model the joint drought duration and severity distribution using two-dimensional copulas. The method … as a function of the dependence parameters. The drought duration and severity are assumed to be exponential and gamma …. The copula fitting results for drought duration and severity are quite satisfactory. The bivariate drought analyses …

state, India. Drought is a recurrent phenomenon and risk assessment of droughts can play an important role in proper … planning and management of water resources in the study region. In the study, drought events are characterized by severity and … duration, and drought occurrences are modeled by Standardized Precipitation Index (SPI) computed on mean areal precipitation …

in the northwestern districts of Bangladesh in the recent years. In this paper, groundwater scarcity and drought in three …

This study analyzes drought characteristics in the Awash River Basin of Ethiopia based on meteorological and … hydrological variables. Standardized precipitation index is used for temporal and spatial analyses of meteorological drought and … the theory of runs is used to define hydrological drought by considering streamflow as the drought indicator. Drought …

considered, thus understanding the probable evolution of a drought as influenced by the climate and, in particular, the … seasonality of rainfall. However, these results, which are promising in view of drought management, require further developments … predictions of drought class transitions in view of drought risk management are also discussed. Copyright Springer Science …

This paper aims at the stochastic characterization of droughts applying Markov chains modeling to drought class … considered. The drought class probabilities, the expected residence time in each class of severity, the expected time for the … transition between drought classes and the drought severity class predictions 1, 2, or 3 months ahead have been obtained. Those …

Regional drought modes in Portugal are identified applying the Principal Component Analysis (PCA) and Varimax rotation … dataset with 0.5° spatial resolution. Results suggest that the three datasets well agree in identifying the principal drought …