Mapping of Coastal Hazards in the South-West of Côte d’Ivoire on SRTM Images

Abstract

Finding a solution to the coastal risks that are becoming recurrent in Côte d’Ivoire, including the risk of flooding, data collection has been undertaken on the entire coast. High spatial resolution images such as the SRTM images were used to be processed in the Qgis software to evaluate with high precision the overflow hazards of the coastal courses from Tabou to Sassandra, located on the west coast of the country. To do this, the layers of the processed slopes were superimposed on those of the rivers to assess the risks of overflow in the coastal areas concerned. It appears that these areas are marked by low slopes (<16.3%), or even none, likely to increase the intensity of the hazards of overflow of the Sassandra river in Sassandra and the Djiboué lagoon in San-Pédro. The foreseeable risks associated with simulations of overflow distances of 100 to 500 m of the rivers constitute threats to the port activities of San-Pédro that can cause big economic losses for the country, businesses, tourism activities and lodge complexes, coastal resources, and housing. An interactive cartography interface could make it possible to better visualize the results of the processing carried out in a Websig with a view to proposing sustainable solutions for the development of the Integrated Coastal Development and Management Plan of the Ivorian coastal area.