Drought is a lack of moisture in nature, consistent or unnatural. The term consistent refers to
a state of shortage, and unnatural refers to the deviation from an index of the regional …

The present study examined year-to-year variations in areas affected by drought during a
period of 39 water yearsin Iran. Ninety-five meteorological stations were chosen to provide …

Drought is an insidious environmental phenomenon which is more pronounced in arid and
semi arid regions. Central, eastern, and southern regions of Iran are characterized as arid …

Precipitation deficit and its daily, seasonal and annual oscillations are inherent
characteristics of Iran's climate. Droughts are generally characterized by a prolonged and …

Drought is a phenomenon of climate and is one of the catastrophic events that cause much
damage on each occurrence. One of the ways of drought adjustment, evaluation and …

Drought is a recurring and temporary natural event which leads to many damages to human
life and natural ecosystems. In this study, the Standardized Precipitation Index (SPI) and …

Abstract The Standardized Precipitation Index (SPI) is widely used as a drought
meteorological index, to identify drought characteristics including the number of events …

ABSTRACT The Standardized Precipitation Index (SPI) is a widely used drought index to
provide good estimations about the intensity, magnitude and spatial extent of droughts. The …

Assessment of drought is one of the most important steps in risk management of drought
analysis. Drought is mostly the result of a decrease in precipitation in comparison with the …

In this research, the precipitation data of 16 synoptic stations from 1980 to 2014 in the south
of Iran were used to evaluate the changes of the spatial and temporal pattern of drought …