TEMPORAL VARIABILITY OF ANNUAL RAINFALL IN THE MACTA AND TAFNA CATCHMENTS, NORTHWESTERN ALGERIA

Mohamed MEDDI, Ali ARKAMOSE ASSANI, Hind MEDDI

Résumé


Abstract:
We analyzed the temporal variability of annual precipitation measured at five stations in the
Macta (14,380 km2) and Tafna (4,949 km2) catchments located in northwestern Algeria, in
connection with climate indices over the 1950?2004 period. Analysis of the temporal
variability using linear regression and Pettitt test revealed a significant decline in annual
rainfall in the mid-1970s in both basins. Furthermore, a decrease of at least 20% of total
annual rainfall is also observed at all five stations. As for the relationship between climate
indices and variability of annual precipitation, canonical correlation analysis shows that,
from 1950 to 2004, precipitation at the five stations are negatively correlated with NINO4
and, to a lesser degree, with NAO

Mots-clés


Annual rainfall ;Drought ;Climate indices ;Linear regression; Pettitt test ; Macta and Tafna catchments ;Algeria.

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