Application de l'analyse factorielle en composantes principales à l'étude de la variabilité régionale et interannuelle des précipitations ardéchoises

Abstract

This study uses 12 series of 40 annual rainfalls (1931 to 1970) previously controled and covering the department of Ardèche. Authors applied a multivariate factor analysis to the matrix (12 X 40) of annual precipitations. This points out two important factors of spatial dispersion : on one hand the « plateau du Coiron » and on the other hand the distance from the Rhône Valley. Projected on these two factors the observation-dots show graphically the annual variability of the spatial dispersion.