CONTRIBUTION OF REMOTE SENSING TO THE IDENTIFICATION OF GROUNDWATER RESOURCES IN MAYO-DALLAH DEPARTMENT, SOUTH-WESTERN CHAD

Located in south-western Chad, the Department of Mayo-Dallah has a problem of access to groundwater in terms of quantity due to the complexity of the area (basement). The aim of this study is to extract the lineaments of the Mayo-Dallah Department using remote sensing to identify potential groundwater resources. To achieve this, a satellite image (Radar Sentinel 1-C) was downloaded and subjected to various processing operations.A total of 7193 lineaments were extracted, with lengths ranging from 0.30 to 3Km. 96.7% of the lineaments are small, less than 1Km. Lineaments of 1 to 3Km considered to be major represent 3.29%. The distribution of major lineaments on the directional rosette reveals two main directions E-W and N-S and secondary directions SE-NW, ESE-WNW and NE-SW.The lineament density map shows that the southern and western parts of the study area have good lineament density. These areas have a high water potential and could influence recharge.