期刊名称：Science et changements planétaires / Sécheresse
印刷版ISSN：1147-7806
电子版ISSN：1777-5922
出版年度：2011
卷号：22
期号：3
页码：149-158
DOI：10.1684/sec.2007.0099.
出版社：John Libbey Eurotext
摘要：Figures See all figures Authors Amel Talia , Mohamed Meddi , Belkacem Samir Bekkoussa Université de Mascara Faculté des sciences et technologie Laboratoire des sciences et techniques de l’eau BP 763 Route de Mamounia Mascara 29000 Algérie, École nationale supérieure de l’hydraulique Laboratoire du génie de l’eau et l’environnement BP 31 Blida Algérie Key words: Algeria, principal component analysis (PCA), rainfall, Sahara DOI : 10.1684/sec.2007.0099. Page(s) : 149-58 Published in: 2011 To characterize and interpret the space-time variations of annual rainfall, we selected 71 stations with long series distributed more or less uniformly across the studied zone. The application of the Principal Component Analysis (PCA) with rotation distinguishes between the homogeneous pluviometric areas corresponding to the four significant principal components. The cartography of projections of the variables on the principal components enabled us to better understand the spatial distribution of the rains and the physical parameters which generate them. From the statistical methods of detection of ruptures within the time series and the charts we noted that no significant tendency is recorded east of high plateaus and in the extreme south of the Sahara in spite of the downward trend in the annual pluviometric totals. We also noticed a sharp decline in rainfall in the west and centre of the high plateaus during the decade 1970-1980. This reduction is characterized by the high level of its intensity and its duration.
关键词：Algeria; principal component analysis (PCA); rainfall; Sahara
