Journal of Ecology and Environment

The Ecological Society of Korea (한국생태학회)
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GIS overlay analysis for hazard assessment of drought in Iran using Standardized Precipitation Index (SPI)

  • Asrari, Elham (Payame Noor University (PNU)) ;
  • Masoudi, Masoud (Department of Desert Regions Management, College of Agriculture, Shiraz University) ;
  • Hakimi, Somaye Sadat (Department of Desert Regions Management, College of Agriculture, Shiraz University)
  • Received : 2012.08.15
  • Accepted : 2012.10.10
  • Published : 2012.12.01
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Abstract

The Standardized Precipitation Index (SPI) is a widely used drought index to provide good estimations of the intensity, magnitude and spatial extent of droughts. The objective of this study was to analyze the spatial pattern of drought by SPI index. In this paper, the patterns of drought hazard in Iran are evaluated according to the data of 40 weather stations during 1967-2009. The influenced zone of each station was specified by the Thiessen method. It was attempted to make a new model of drought hazard using GIS. Three criteria for drought were studied and considered to define areas of vulnerability. Drought hazard criteria used in the present model included: maximum severity of drought in the period, trend of drought, and the maximum number of sequential arid years. Each of the vulnerability indicators were mapped and these as well as a final hazard map were classified into 5 hazard classes of drought: one, slight, moderate, severe and very severe. The final drought vulnerability map was prepared by overlaying three criteria maps in a GIS, and the final hazard classes were defined on the basis of hazard scores, which were determined according to the means of the main indicators. The final vulnerability map shows that severe hazard areas (43% of the country) which are observed in the west and eastern parts of country are much more widespread than areas under other hazard classes. Overall, approximately half of the country was determined to be under severe and very severe hazard classes for drought.

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References

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