Analele Universităţii din Oradea: Seria Geografie (Mar 2017)
STUDY OF THE CLIMATE CHANGES IMPACT ON THE SPATIOTEMPORAL VARIABILITY OF PRECIPITATION IN THE EASTERN PART OF THE SAHARAN ATLAS; CASE OF THE BELEZMA, THE AURES AND NEMEMCHA, AND THEIR BORDERS. GEOMATICS AND GEOSTATISTICAL APPROACH
Abstract
The survey and the characterization of the climatic variability at the reduced scales prove to be fundamental for understanding the impacts of the climatic changes on the projects of development and the local vulnerability. One of the main contributions of this study is to analyze the spatio-temporal variability of rainfall series in the oriental termination of the Saharan Atlas that integrates three major mountain ranges and their borders to know: The Belezma, the Aures and the Nememchas during 44 years (from 1969 to 2013) with correction methods, rainfall indices, geostatistical analysis and interpolation (inverse Distance weighting). The results show that climate especially show a significant interannual variations in the region of survey between the north slopes area and the South, an alternation of wet and dry periods and a reduction in the values of the rainfall during the last years. Temporal analysis at sites shows that precipitation is stationary in the mountainous regions as stations of Chelia, Yabous, Ain mimoune, Boudella and Ouledchelih, which record maximum values; in contrast the zones of plain stations present minimal values during the study period. The spatial analysis based on interpolation methods revealed variations in rainfall especially during two decades (1989-1998 and 1999-2008) with maximum values. Its variations allow detecting the impact of climate change on all region of study on a latitudinal and altitudinal plan.
