ETUDE DE LA VARIABILITE ET DE LA STRUCTURE DE PLUIE ANNUELLE DANS UNE REGION SEMI-ARIDE : CAS DU BASSIN VERSANT DE LA MACTA (NORD-OUEST ALGERIEN)

Abstract

The social and economic role of precipitation is crucial in a region such as the watershed Macta, subjects to influences in turn Mediterranean and Sahara. The rainfall varies from one point to another, and its distribution over the twelve months of the year fluctuates considerably, this excessive concern irregularity anyone interested in the study of precipitation in order to development and enhancement of agricultural land. In this study, we use Principal Component Analysis (PCA) to regionalize the annual rainfall by analyzing on the first principal factor. The regions obtained are validated by a more appropriate method, which is the Factor Analysis (CVA). The study of the structure of the rain is done by using the aver variogram. The isotropy of the rainfall field is analyzed by directional variograms. An optimal map of the rainfall is derived by Kriging neighborhood in rolling; a map to estimate interpolation errors will accompany it.