Climate change impact on rainfall spatio-temporal variability (Macta watershed case,Algeria) |
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Authors: | Abdelkader Elouissi Mohammed Habi Boumedienne Benaricha Sid Ahmed Boualem |
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Institution: | 1.Faculty of Nature and Life, Laboratoire de Recherche sur les Systèmes Biologiques et la Géomatique (L.R.S.B.G.),University of Mascara,Mascara,Algeria;2.Faculté des Sciences de l’ingénieur, Département d’hydraulique,Université Abou Bakr Belkaid,Tlemcen,Algeria;3.Faculty of Nature and Life, Geo-Environment Laboratory,University of Mascara,Mascara,Algeria |
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Abstract: | This work describes the climate change impact study on rainfall patterns in Macta watershed, located in the northwest of Algeria. The monthly rainfall data collection, verification and validation have built a database with 42 stations, each with 42 years of observations from 1970 to 2011. The study of annual total rainfall has identified a downward trend and quantifies the deficits that are within the observation time series. The division of the annual rainfall series into four periods allowed to highlighting the increase in inter-year temporal variability with the coefficient of variation increases from 17 to 27%. The study shows an annual rainfall deficit increment from 13 to 25%. The standard deviation values decrease significantly for the last two periods showing a spatial variability. Multivariate statistical study by the hierarchical clustering method resulted in the formation of station groups indicating the unification of monthly rainfall patterns. |
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