Contribution of Sentinel Radar Images 1Ato the Extraction of Lineaments from the Lobo Watershed ...

Since surface water is still vulnerable to climatic threats and the effects of human activity, improving the conditions of access to drinking water for the people of the Lobo watershed necessitates the use of groundwater. These underground waters, however, find themselves in bedrock aquifers, which are complex aquifers. As a result, the aim of this research is to characterise the fissure aquifers that control underground run-off in the Lobo catchment area's aquifer system. The tool used was to map fractures and their spatial distribution using 1A sentinel radar images. The lineaments were validated by comparing and highlighting the lineaments from radar images with the fractures revealed by photo-geological images. The map of lineaments was then superimposed on the map of productive boreholes, which were described as boreholes with a flow rate greater than or equal to 5 m3/h. This fracturing map was superimposed on the piezometric map to assess the traffic corridors. This work allowed for the extraction of 9,753 lineaments over a 7,000 km2 surface area. We were able to validate 121 major fractures with an average length of 9 kilometres using various validation techniques. Furthermore, the most active boreholes are usually less than 300 metres from the fractures. The distribution of these fractures' orientations showed variability in direction and a predominance of the N-S, NW-SE, and NE-SW families. The spatial heterogeneity of the fracture network, which is dominated by geomorphology, is highlighted by the fracturing density maps and the density of the number of fracture crossing points. lithological encounters and geological formations The Lobo River and its largest tributary, the Dé, tend to flow across fractures. The aquifer system is drained by this river and its tributaries. The results of various thematic maps are useful in the creation of potential high-yield hydraulic wells (Q 5 m3/h).

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