عنوان مقاله [English]
نویسندگان [English]چکیده [English]
Climate variation is one of the natural characteristics of atmospheric calculation which can cause some oscillation or effect prohibited on process of aerology parameters, such as precipitation and temperature (Razi, et.al, 1882). Drought is a normal feature and may occur in every climate regions.
In the present study, standard precipitation index (SPI) was selected and it's advantages in regional analysis and creating chronological relations between occurrences of drought in different areas has been considered for studying the states characteristic of monthly precipitation, we have used GIS software such as ArcMap , Arcveiw , Smada , … .
The most severe drought has happened in 2001. The least SPI is related to Nehbandan station with (-2.18). In this statistical period, the strong humidity has occurred in 1982, which Qaen had the highest SPI, around 2.65.
Finally, considering the high capability of time series analysis in predicting different phenomena, and after analyzing the time series the average monthly drought intensity for different parts of province had been identified.