Visualization of the spatial extent of flooding expected in the coastal area of Algiers due to sea level rise. Horizon 2030/2100

Sea level rise, one of the major consequences of global warming, is one of the most expected phenomenon of the 21st century. Coastal areas, due to their geographical location, will be exposed to extreme weather events, such as flooding. This study evaluates the impact of sea level rise on the center of the capital of Algeria, with decennial and centennial occurrence. It is based on an empirical method to improve the assessment of extreme levels, taking into account several parameters (the astronomical tide, the surge of waves, the rise due to a decrease in atmospheric pressure, and scenario of sea level rise), calculated from the formula of Hoozemans,superimposed on a digital terrain model of 3 m resolution to delimit the potentially submersible areas, all integrated into a geographic information system (QGIS 3.10). The calculation of the vulnerability of our case study was based on scenarios of 0.2 m in 2030 and 0.65 m in 2100. Our results allow us to map the land at risk of flooding and indicate that 26% and 36% of the study area will be submerged by a respective flood level of 6m to 8 m, in conjunction with extreme weather and sea events. The most severely affected sectors are expected to be the port of Algiers with its piers, the port terraces, the central urban area, the reserve corridor, the Hussein-Dey waterfront, the Sportspalace, and the Algiers Opera. The study stresses the importance of developing adaptation strategies to the risk of marine submersion in order to reduce damage such as raising the protective structures above the maximum level of flooding, taking into account the hazard by the regulations in force, planning the growth of issues, the development of prevention plans. This study allows us to analyze the future exposure of this territory to the different processes involved and highlights the vulnerability of the coastal areas studied. It provides valuable information for decision makers and coastal managers to guide and readjust future development in the most exposed areas,especially the port conversion of Algiers planned in 2030 by the master plan of development and urbanism. [Display omitted] •GIS was used for data integration and mapping of lands at risk of flooding.•Results useful to managers in developing sea level rise risk mitigation plans.•The delineation of flood-prone areas is done using a 3m digital terrain model.•The future port conversion of Algiers is threatened by sea level rise.•Improved approach to illustrate the impa