كليدواژه :
drought , Drought index , Drought Evaluation. , شاخصهاي آماري , هواشناسي , خشكسالي , ايران
چكيده لاتين :
Drought is one of the natural calamities which has the highest degree regarding strength, scope, the duration of incidence, area expansion, life casualties, economical losses & long-term effects, compared to the other natural calamities.
In the recent decades, the frequency of drought is more than other calamities affecting human life on the earth. Generally the total no. of victims of the drought has been estimated as about 1.5 milliard during 1966 to 1988 that is 52% of the total victims in all the natural calamities. Drought losses, mainly consist of decrease in the function of ranges & also decrease in the production of farming products especially dry farming and reducing agricultural and drinking water resources, reducing under ground and superficial resources, increasing plant and animal diseases and pets, increasing immigration and finally increasing the bad environmental, economical and social effects that threaten constant development of region.
In this article reflecting some done researches and studies on the stability & fore warning of drought, at first the drought incidence and the common methods of stability are inspected.
Then drought in the farming years 1999-2000 and 2000-01 have been inspected regarding the scope of inflicted losses and determining some available indices for Yazd province. Also, the drought status in these years in other provinces have been inspected and evaluated through comparing suggested indices
