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Paper Information

Journal:   IRANIAN JOURNAL OF SOIL AND WATERS SCIENCES   2003 , Volume 17 , Number 2; Page(s) 201 To 209.
 
Paper: 

MONITORING AND ASSESSMENT OF DROUGHT SEVERITY IN MASHHAD AT DIFFERENT TIME SCALES USING STANDARDIZED PRECIPITATIONINDEX (SPI)

 
 
Author(s):  SANAINEJAD S.H., ANSARI H., DAVARI K., MORID S.
 
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Abstract: 
Drought is a natural phenomenon that starts gradually, and extends tranquilly. However, it affects human activities drastically. This creeping disaster happens almost in any kind of climate all over the world, be it humid or dry, when there is a deficit in the precipitations of a certain time period in comparison to the normal precipitation of the same period. Study of drought periods of Mashhad over a 32 years period (1968 - 1999) demonstrates that drought periods in this region are recurring usual events. Almost in every 10 years, there is a severe and long (more than a year) drought period. The trend of 32 years precipitation data reveals that in the recent years duration and frequency of the drought events have increased for all time scales, but their severity has decreased. This study shows that from 1968 to 1999, the most severe one-year drought occurred in 1971, and the wettest one-year period occurred in 1992. Finally, the study proves that the combinations of smalltime-scale droughts, with short durations and great severities, forms large time-scale droughts, with long durations and moderate severities.
 
Keyword(s): DROUGHT, DROUGHT DURATION, DROUGHT FREQUENCY, STANDARDIZED PRECIPITATION INDEX (SPI)
 
References: 
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