Investigation on Spatio-temporal Variability of Meteorological Drought in Southwestern Iran(case study in Karkheh basin)

Authors

1 Associate Prof., Soil Conservation and Watershed Management Institute

2 Assistant Prof., Soil Conservation and Watershed Management Institute

Abstract

Drought charachteristics including severity, duration and magnitude and the associated spatio-temporal variability in Karkheh basin was investigated using Standardized precipitation index (SPI) for the period 1965-2000. The results showed that the time variability of SPI series strongly co-vary accros the basin resulting in simultaniusely occurring dry and wet spells in the considered stations though the they may differ regarding to drought severity.  Regarding to SPI on 3 month time scale it was found that most of the stations has experienced dry spells in 1966-67, 1970-71, 1973, 1977-78, 1984, 1991, 1995 and 1998-2000 which were very important for the basin regarding agricultural point of view. Though the short dry spells most often occur simultaneously in all stations when shorter SPI time scales are considered, but they are less concordance regarding the initiation and termination of drought when SPI time scale increased. The results also indicate that the basin has experienced between 20 and 23 dry spells among which some last between 9 and 11 months. A survey on SPI series at 12 month time scale also showed that the basin experienced between 7 to 10 long lasting drought events. The most frequent drought events in October (between 11 and 14 cases) were occurred in southeastern and wetern parts of the basin. In November, the northern, northwestern and southern parts of the basin are the regions that frequently hitted by drought ranging between 20 and 24 events. In April and May the northern part of the basin has experienced the most frequent drought events. Overall, it can be concluded that the northen and southern parts of the basin are the more prone areas to frequent drought events.

Keywords

References

 

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