Utilisation de l’image optique pour la cartographie du risques inondation en zone côtières cas de la ville de Jijel

Abstract

Flooding is considered a major risk worldwide and accounts for more than a quarter of major natural disasters, Mediterranean watersheds being the most affected by this phenomenon. Algeria is exposed every year to this phenomenon and in particular, to the region of Jijel, The floods of December 2020 in Jijel caused a partial collapse of the bridge of Oued el Kantara, bridge and loaded 18 vehicles to the entrance of the wade, in particular flowing the accumulation of mud. The aim of our study is to contribute to flood management in the Jijel region by analysing and mapping the areas most vulnerable to flood risk, The control and the fight against these floods require a mastery of the climatic and hydro geomorphological parameters of this region, this requires the analysis of the series of precipitation, the remote sensing images and digital field models to identify the causes of these floods. The application of remote sensing in the ENVI and ARC GIS software allows the identification of floodplains in the Jijel region during this event by comparing satellite images before and after the flood and images of Google Earth Ancient and recent for the detect the presence of a change and therefore flood in this region.