Comparison of SPI and RDI in drought analysis in local scale with emphasizing on agricultural drought (Case study: Qazvin and Takestan)

Document Type : Original Article

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Abstract

The SPI index in spite of its simplicity could not be accepted as a national index for evaluating the drought condition of different climates in Iran. The RDI index with the same structure as the SPI but using PET has outstanding features for agricultural and hydrological drought recognition. In this research, the two indices were applied to evaluate the drought condition of Qazvin and Takestan. The results do not show sharp differences between the two indices with respect to the drought analysis, but the RDI showed more sensitivity to extreme conditions.  It seems that the RDI is more powerful than the SPI in agricultural drought recognition. According to the achievements, Qazvin has experienced extreme drought from agricultural point of view which emphasize the inherent risk of rainfed farming in this area. In the meanwhile, both the two indices illustrated the fragile condition of the region based on their evaluation of the hydrological drought which in turn shows the necessity of empowering the water resources system in the region and stopping the water delivery toward neighboring regions like Tehran and Guilan provinces

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Irrigation and Water Engineering
Volume 3, Issue 1 - Serial Number 9
December 2012
Pages 111-122

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