Document Type : Original Article


1 M.Sc. Graduate, Dept. of Natural Resource. University of Sari, Iran

2 Borujerd Branch, Islamic Azad University, Borujerd, Iran


The Standardized Precipitation Index (SPI) has become a popular measure of drought across the globe. In this study, Standardized Precipitation Index (SPI) was used in annual period of time to survey on drought. Also, in order to zonation frequency of drought, geographic information system (GIS) software and Kriging method used for extracting dry areas. The zoning maps show most severe drought is in eastern areas of the province


Batisani. N., (2011), the Spatio-Temporal-Severity Dynamics of Drought in Botswana, Journal of Environmental Protection, 2(6): 803-816.
Guttman. N.B., (1998). Comparing the palmer drought index and the standardized precipitation index. Journal of the American Water Resources Association 34,113–121.
Goovaerts. P., (2000), Geostatistical approaches for incorporating elevation into the spatial interpolation of Rainfall, Journal of Hydrology, 228 (1): 113-129.
Loukas, A., and Vasiliades. L. (2004). Probabilistic analysis of drought spatiotemporal characteristics in Thessaly region, Greece, Natural Hazards and Earth System Sciences 4: 719–731
Loukas. A., Vasiliades. L., and Tzabiras. J., (2008), Climate change effects on drought severity. Adv. Geosci, 17: 23–29.
McKee.T.B., Doesken. N.J., Kleist.J., (1993). The relationship of drought frequency and duration to time scales. In: Proceedings of the Eighth Conference on Applied Climatology. American Meteorological Society, Boston:179–184.
Meyer. S. J., Hubbard. K. G. Wilhite. D. A, (1993), ‘A crop-specific drought index for corn: I. Model development and validation’, Agronomy J. 86, 388–395.
McKee.T.B., Doesken. N.J., Kleist. J., (1995). Drought monitoring with multiple time scales. In: Proceedings of the Nineth Conference on Applied Climatology. American Meteorological Society, Boston, 233–236.
Mishra. A.K., Desai. V.R., Singh. V.P. (2007), Drought forecasting using a hybrid stochastic and neural network model. Journal of Hydrologic Engineering. 12 (6): 626–638.
Mishra. A.K., Singh. V.P., (2009), Analysis of drought severity-area-frequency curves using a general circulation model and scenario uncertainty. Journal of Geophysical Research. 114: 18
Mishra. A.K., Singh. V.P., Desai. V.R., (2009), Drought characterization: a probabilistic approach. Stochastic Environmental Research and Risk Assessment. 23(1): 41–55.
Palmer. W.C., (1965). Meteorological drought. Research paper no. 45, US Weather Bureau (NOAA Library and Information Services Division, Washington, DC20852).
Palmer.W.C., (1968). Keeping track of crop moisture conditions, nationwide: the new crop moisture index. Weatherwise, 21:156–161.
Shahid. S., (2008). Spatial and temporal characteristics of droughts in the western part of Bangladesh. Hydrological Processes. 22,2235–2247.
Shahid. S., Behrawan. H., (2008), Drought risk assessment in the western part of Bangladesh. Natural Hazards, 46: 391–413.
Shahid. S., Hazarika.M. K., (2010), Groundwater Drought in the Northwestern Districts of Bangladesh, Water Resource Management, 24: 1989–2006.
Vogt. J.V., Somma. F., (2000). Drought and Drought Mitigation in Europe. Kluwer, Dordrecht.
Wilhite. D.A., (2000). Drought as a natural hazard: Concepts and definitions. In: Wilhite, D.A. (Ed.), Drought: A Global Assessment, Hazards Disaster Ser., vol. 1. Routledge, New York, 3–18.