Mapping of the Biophysical Impacts of the Opening Works of a New Pass on the Sandy Coast of Grand-Lahou (Ivory Coast)

Abstract

The problem of the dynamics of the Grand-Lahou sandy coast has led to the design of an investment and management project for coastal areas in Côte d'Ivoire (West Africa Costal Areas project), with the main objective of carrying out work to stabilize the sandy coast. The objective of this study is to map the biophysical environmental impacts of these protection works. To do this, the Land Cover and Land Use (LCLU) was possible thanks to the processing of data from the USGS Earth Explorer (https://earthexplorer. usgs.gov/) and Earth data, what are Landsat 8 OLI TIRS, Landsat 7 ETM and ASTER DEM images. An interpolation of the NDVI, NDBI and MNDWI indexes was necessary for the realization of of the environment baseline. Google Pro images from the CNES Airbus sensor were used to map the biophysical impacts of the work. These are a total of 98 potentially destroyed trees, a building with an area of 97.14 m2, surfaces of aquatic plants of 678.82 m2 and 113.54 m2, a surface of shrubs and grasses of 327, 37 m2 anda lake ecosystem of 1646.83 m2.