Geographia Technica, Vol 14, Issue no.1/2019, pp. 36-48

VARIABILITY ANALYSIS OF TEMPORAL AND SPATIAL ANNUAL RAINFALL IN THE MASSIF OF AURES (EAST OF ALGERIA)

Adel KHENTOUCHE, Hadda DRIDI (Batna, Algeria)

DOI: 10.21163/GT_2019.141.03

ABSTRACT: The spatial and temporal variations of precipitation in the Aures Massif of Algeria from 1974 to 2009 were investigated using a geostatistical approach. This diachronic approach did not allow a real cyclical differentiation but reveals two phases obvious distinct wet and dry, very marked. Annual rainfall variability is associated with disruption stationary in the series. The use of the rainfall index (PCI) clearly explains the state of variability and the temporal behavior of the annual rains. The climate of the region was in the semi-arid upper floor, and had considerable rainfall. However, this situation has been reversed since 1991. It is predicted that rainfall will decrease from 50 to 105 mm/year on altitudes and the foothills, from 13 to 50 on Saharan areas. Statistical tests reveal breaks around 1991-1994.we notice a severe drought which began in 1991. The results indicated that the spatial pattern of precipitation was primarily the local climate effect signi´Čücant type, and inside the massif, altitude and latitude are the two factors that control this variability that installs and starts to take the form of climate change


Keywords: Variability, Drought, Breaking, Rain phase, Standardized index of rain

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