Articles | Volume 15, issue 3
Research article
18 Mar 2015
Research article |  | 18 Mar 2015

Spatial distribution of the daily precipitation concentration index in Algeria

A. Benhamrouche, D. Boucherf, R. Hamadache, L. Bendahmane, J. Martin-Vide, and J. Teixeira Nery

Abstract. In this paper, the spatial and temporal distribution of the daily precipitation concentration index (CI) in Algeria (south Mediterranean Sea) has been assessed. CI is an index related to the rainfall intensity and erosive capacity; therefore, this index is of great interest for studies on torrential rainfall and floods. Forty-two daily rainfall series based on high-quality and fairly regular rainfall records for the period from 1970 to 2008 were used. The daily precipitation CI results allowed the identification of three climate zones: the northern country, characterized by coastal regions with CI values between 0.59 and 0.63; the highlands, with values between 0.57 and 0.62, except for the region of Biskra (CI = 0.70); and the southern region of the country, with high rainfall concentrations with values between 0.62 and 0.69.

Short summary
In the Mediterranean climate as well as in some tropical climates, such as in Algeria, a few rainy days account for a high percentage of the annual total precipitation. The contribution of very rainy days can be evaluated by means of the concentration index (CI) (Martin-Vide, 2004). The values of CI for 42 meteorological stations in Algeria, over the period 1970--2008, have been calculated; the highest values occurred in Biskra and in the southwest.
Final-revised paper