Modélisation des courbes IDF à travers des stations pluviométriques de la région de l’Ouest du pays.

Abstract

This study represents a contribution to the development of a methodology of work and planning for risk prediction by the use of hydrological modeling. The storm hazard is characterized by the modeling of the rainfall intensity-durationfrequency (IDF ) curves which represent a keytool in the planning, management and prevention of flood risk. In this regard, the Northwest part of Algeria has been proposed as the zone of this study. The establishment of the IDF curves allows extrapolating the different intensities for aggregation periods ranging from 15 minutes to 360 minutes. Data processing is facilitated by the Hydraccess. Thereafter, the adjustment is made by the HYFRAN-Plus. The results of adjustment allow to build IDF curves to arrive at defining the storm risk , which is in a strong way in the southern part of the study area ( the Oran Highlands Basin) , then this risk decreases towards the north, and the west side ( the Tafna basin) presents the lowest risk .