TITLE:
Characterization and Modeling of Fractured Aquifers Using Electrical Resistivity Tomography in Langbabokohou, Bouaké (Central C?te D’ivoire)
AUTHORS:
Kouamé Gbèlè Hermann Loukou, Loukou Nicolas Kouamé, Kouao Laurent Kouadio, Brou Richmond Konan, Yapo Martial Assi
KEYWORDS:
Electrical Resistivity Tomography, Basement Aquifers, 3D Modeling, Groundwater, C?te D’Ivoire
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.14 No.5,
May
28,
2026
ABSTRACT: Access to groundwater in crystalline basement regions of West Africa is challenging due to the strong heterogeneity of fractured aquifers and the difficulty in identifying productive zones. In the Bouaké area of central C?te d’Ivoire, high borehole failure rates highlight the need for improved aquifer characterization. This study aims to address this challenge by characterizing and modeling fractured basement aquifers in Langbabokohou using electrical resistivity tomography (ERT) integrated with 3D geoelectrical modeling. Six ERT profiles, oriented N70? and spaced 200 m apart, were acquired using the Wenner-Schlumberger array and inverted to obtain true resistivity sections. Resistivity data were analyzed to construct depth-specific maps and a three-dimensional model of the subsurface. Results reveal three main geoelectrical units: a discontinuous, resistive lateritic cover (R1); a conductive weathered layer forming the shallow aquifer (C); and a resistive crystalline basement (R2) overlain by a hydraulically significant fractured horizon. R1 is thin and spatially fragmentary, providing only partial protection to the underlying aquifer. Unit C exhibits low to intermediate resistivity values (25 - 635 Ω?m) and forms a laterally extensive shallow aquifer, while the fractured horizon (635 - 2000 Ω?m) ensures vertical hydraulic connectivity to the deeper basement aquifer. R2 is highly resistive (1723 - 4973 Ω?m) and generally impermeable, except in zones with dense fracturing where groundwater circulation is enhanced. Spatial variability in weathered thickness and fracture density governs aquifer productivity and recharge efficiency. This study demonstrates that combining ERT with 3D geoelectrical modeling provides a robust framework for understanding basement aquifer architecture, identifying hydraulically active fracture zones, and informing sustainable groundwater management in tropical crystalline terrains.