Coupling of remote sensing and geophysics for the study of groundwater resources in the ouaddaï region east of chad

This study covers the town of Abéché and its surroundings, located in eastern Chad in the province of Ouaddaï. Sitting on a Precambrian basement, the fractures constitute the preferential flow zones for underground water reserves. In order to highlight these fractures, a linear study was carried out using a Landsat 8 image. The techniques used made it possible to enhance the discontinuities contained in the first main component, facilitating the mapping of the lineaments. The lineament map obtained was validated from existing geological maps, geophysical data and field knowledge. The map of potential points for the siting of boreholes is obtained by digitizing the points of intersection of hydraulic fractures. This study, based on remote sensing and geophysics, identified favorable points for the siting of future hydraulic boreholes for the supply of drinking water