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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 15, issue 3 | Copyright

Special issue: Advances in meteorological hazards and extreme events

Nat. Hazards Earth Syst. Sci., 15, 617-625, 2015
https://doi.org/10.5194/nhess-15-617-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 18 Mar 2015

Research article | 18 Mar 2015

Spatial distribution of the daily precipitation concentration index in Algeria

A. Benhamrouche2, D. Boucherf1, R. Hamadache1, L. Bendahmane1, J. Martin-Vide2, and J. Teixeira Nery3 A. Benhamrouche et al.
  • 1National Climate Centre at the National Meteorological Office, Av. Khemisti B.P. 153, Dar el Beïda, Algiers, Algeria
  • 2Climatology Group, University of Barcelona, C/Montalegre 6, 08001 Barcelona, Spain
  • 3Department of Geography, UNESP Ourinhos, Av. Vitalina Marcusso, 1500 São Paulo, Brazil

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.

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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.
In the Mediterranean climate as well as in some tropical climates, such as in Algeria, a few...
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