Apport de la télédétection et de l’hydrogéomorphologie à l’étude du risque inondation dans à la vallée de l’Oued Seybouse, Nord-Est Algérien

Abstract

A flood is the submersion by fresh or salt water of a generally emerged area. This submersion can be done slowly or suddenly and be repeated regularly or temporarily. Floods are the most devastating natural hazard and the one that causes the most economic and human losses. Algeria is exposed every year to this phenomenon and in particular the region of Annaba, which is one of the largest coastal cities in the country on the one hand by its demography and on the other by its infrastructure, therefore its Mediterranean climate characterized by abundant and sometimes torrential rains favors floods. The January 2019 floods in Annaba caused serious loss of life and extensive property damage estimated at several billion dinars, including the closure of El Hadjar steel complex, entire isolated towns and cut roads. The application of remote sensing in ARC GIS and ENVI softwares allowed the identification of the flooded plains in the valley of Oued Seybouse during this event, by comparing satellite images before and after the flood and by establishing the MNDWI and the band report map which by its data detected the presence of a change and therefore looding in this region