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Hossein Asakereh

 حسین عساکره
تغییرات زمانی-مکانی بارش استان اصفهان طی دهه های اخیر
Tempo-Spatial Change in Isfahan Province Precipitation Suring Recent Decades
Abstract


Abstract Due to precipitation effect on the basin hydrology, it is important to increase knowledge about tempo-spatial changes of precipitation. In this research, the attention was focused on tempo-spatial of Isfahan province precipitation characteristics that provide annual precipitation maps based on Variograme and simple Kriging methods since 1969 to 2000. Based on these maps, annual precipitation in Esfahan is 186.9 mm. As shown in the main paper, the longitude and altitude are the most important factors with regard to precipitation spatial changes. The spatial change models is described by using principal component analyses and regression model. This model shows the effect of longitude, elevation and latitude respectively. There is a quadratic trend in precipitation behavior that affects CV coefficient dramatically and make three oscillatory precipitation phases. The wettest and driest years were 1969 and 1985 respectively. Keywords: Universal kriging, Spatial change, Variograme, Principal component, Quadratic trend, Phases

 

 

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