تحليل التباين المكاني لتوزيع الأمطار في منطقة القصيم وسط المملكة العربية السعودية

الملخص EN

This study deals with the spatial analysis of variations of annual rainfall using the recorded rain data during the period 1981-2011 in stations of Buraidah (U107), Unayzah (U001), Rass (U216), Uglat Sgor (U002).

Al Madhnab ( U217) and Kra'a Al Marw (U004) and the meteorology station of Prince Naif Airport (40405) in Al Qassim area.

These stations contain the complete series time of rainfall data which can helping in the analysis of spatial-period variations of annual rainfall.

The selection of these rainfall stations because they contain annual rainfall data for a period of 31 consecutive years.

It has helped to determine the spatial variations of the annual average and the standard deviation at each station.

The statistical test showed some real differences in the geographical distribution of the annual rains, at the significance level 0.05, with 61.015 of Chi Square value at the degree of freedom 30, 44.596 of Krauskal-Wallis value at 6 degrees of freedom, 7.469 Fisher value at the degree of freedom 210 within the groups and 6 between the groups and the T student test values between nine stations.

The Ratios Method show the spatial distribution of annual rainfall variations with values ranged from 0.41 between Prince Nayef Airport and Aglat Sgor stations and 1.86 between Uglat Sgor and Buraydah stations.

Also, the annual rainfall are characterized by the spatial variations of standard error and the confidence limit of the annual average rainfall.

So, that the standard error is ranged between 7.7 mm in Uglat Sgor station and 14.8 mm in Prince Nayef Airport station.