The Analyze Effect Drought Whit The Index of in Ternal Research Percipaitation The Normal z in Information System Geographic in Kashan Region

Drought is the one of the important problem for the mostly semi-arid countries that Iran as of those. Purpose of this article is studying about locations and temporal drought event patterns in Kashan desert. Height average of case study region from sea level is 1987 meters. Common lands of region include sandy hills and salty lands Meteorological data stations in Abyane, Ardestan, Qum, Kashan, and Natanz and basic information environmental consist of Hypsometry, geology and land ability. Meteorological drought temporal and location patterns are determined by research internal method with precipitation Z score in GIS. The climatic studying of region is based on metrology data of synoptic station during 1964-2004 and with focus on Qum and Kashan stations. Bose of heavy rain ranges atmosphere elements in Kashan region and because of influence of environmental condition, we used Z score. By attention to seasonally precipitation of Z score show that in some years not only climatic situation is knowable, (2002-2000 April) but region environmental condition combines a region between desert to mountain that can be explained by a climatic differences condition in the same temporal situation. Z normal indicator shows spring precipitation with positive indicator and generally in 3 years (1999- 2001) had shown negative condition and unsuitable precipitation that the heavier precipitation situation recorded in spring 2001. However, as we said in 2002, precipitation amount explains wet condition and rest of years showed normal condition till low positive.