تحديد التباين الزماني و المكاني لأمطار حوض ديالى و ايجاد السنوات الرطبة و الجافة للحوض باستخدام برنامج SPI

Abstract EN

The current study aims to determine the temporal and spatial variation of rainfall in Diyala basin and find the wet and dry years using SPI program.

The researchers studied the temporal and spatial distribution of the area understudy (Khanaqeen, Kirkuk, Kalar, Suleimania and Darbandekhan).

Also, seasonal distribution in Diyala basin is studied and the rainfall during winter, spring and autumn of the areas understudy is separated.

The efficiency of rain is calculated according to Thornthwaite equation and it is found that the nature of the rain of this area is the same as that of the Mediterranean which is rainy in winter and dry in summer.

The spatial variation of the rain has a great effect in determining the amount of water drainage and the revenues of the basin annually.

The amount of rain of Diyala basin is calculated during two periods: the first one during (1981- 1997) and the second one during (1998- 2014).

The fluctuation of rainfall of these periods is studied according to the standard rain guide SPI and the overall trend of repetition of wet and dry years is determined.

It is concluded that dryness increases with the reduction of rainfall.

This has an evident effect on the drainage and the increase in the water deficit as shown in the table and shapes.