Hydrodynamic characterization of groundwater in fissured aquifers in crystallophyllized basement zones: case of the Lobo catchment area in Nibéhibé (Centre-West, Côte d’Ivoire)

Résumé

The populations of the Lobo catchment area in Nibéhibé, located in the middle of a fissured bedrock, are experiencing difficulties in supplying drinking water due to the impacts of climate variability and the anthropic pressures on the surface water used. The objective of this study is to characterise the hydrodynamic functioning of the waters of the fissured basement aquifers of the Lobo catchment area in Nibéhibé (Central-West, Ivory Coast). The linear correlation method was used to select the most accurate borehole coordinates based on GPS data and an extract from the Digital Terrain Model (DTM). The Spline interpolation method, the isopies extraction method and the flow angle determination method were used to draw up the piezometric maps of high waters (September 2018) and low waters (February 2019). The interpretation of the piezometric maps indicates that the Lobo River and the Dé River constitute an outlet for groundwater during both periods (high waters and low waters). This discharge of groundwater is more intense at the level of the Lobo River unlike the Dé River. Secondly, piezometric domes and cones are observed during both seasons.