Analysis of the Duration and Severity of Agricultural Drought in Recent Half Century Using the Modified ETDI Method and Comparing it with the SPI in Shahrekord Plain

Document Type : Research Paper


Assistant Prof, Water Engineering Department, Shahrekord University, Iran


Severity and duration of agricultural droughts have distressed farmers worldwide by triggering hazards for agricultural products. Droughts are a widespread natural threat with tremendous social impact (Alston and Kent, 2004; Glantz, 1987). They are most often caused by a significant drop in precipitation from the normal amount. Agriculture is often the first sector to be affected by the onset of drought due to its dependence on water resources and soil moisture reserves during various stages of crop growth (Narasimhan and Srinivasan, 2005). Recent studies show that the frequency and severity of droughts seems to be increasing in some areas as a result of climate variability and climate change (IPCC, 2007; Patz et al., 2005; Sheffield and Wood, 2008; Lehner et al., 2006). Among various drought indices, Palmer Drought Severity Index (PDSI) (Palmer, 1965), Crop Moisture Index (CMI) (Palmer, 1968), Standardized Precipitation Index (SPI) (McKee et al., 1993), Surface Water Supply Index (SWSI) (Shafer and Dezman, 1982), and The ETDI (Narasimhan and Srinivasan, 2005) are used extensively for water resources management as well as for agricultural drought monitoring and forecasting. In this study, the agricultural droughts during the recent half-century were evaluated by the modified ETDI method and compared with the SPI as well as meteorological drought index in Shahrekord plain. The results show that the estimation of modified ETDI by SPI3 is applicable.


Main Subjects

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Volume 43, Issue 2
July 2020
Pages 49-61
  • Receive Date: 09 July 2015
  • Revise Date: 08 June 2018
  • Accept Date: 10 June 2018
  • Publish Date: 21 June 2020