Elaboration of a hydrogeological conceptual model by application of electrical resistivity tomography: Case of the Lobo catchment (Centre-Western Côte d'Ivoire)

Kouadio, Kouamé Olivier Jean; Jules, Mangoua Oi Mangoua; Parfait, SOMBO Abe; Paran, Frédéric; Dibi, Brou; Graillot, Didier

doi:10.1016/j.sciaf.2022.e01234

Cited by 2 publications

(2 citation statements)

References 17 publications

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“…ERT profiles revealed a weathering profile several tens of meters thick, composed of three main geoelectric layers below the plateaus and two geoelectric layers in the spring emergence zones (valleys). These results are in line with those of previous studies carried out in a similar geological environment, but which were not aimed at understanding the context of spring emergence 26 , 32 , 42 . From top to bottom, we observe: a resistant layer (500–1600 Ω.m) including locally relatively more conductive zones, then a highly conductive layer (80–500 Ω.m) and a highly resistant layer (resistivity > 1600 Ω.m).…”

Section: Discussionsupporting

confidence: 92%

“…For this reason, the choice fell on the pole-dipole array, known for its ability to differentiate complex geological structures at great depth with short ERT cables, as highlighted notably by Kumar et al 49 . In addition, the pole-dipole array has a significantly higher signal strength than other arrays to obtain high-resolution 2D resistivity data, as well as higher vertical sensitivity and greater depth of investigation on short linear arrays, as confirmed notably by Kumar et al 49 and Olivier et al 32 who worked in similar geological environments. At site level, two ERT profiles (SP_F4 and SP_F15) were carried out at the plateau level to characterize the geoelectrical succession in the vicinity of boreholes F4 and F15.…”

Section: Methodsmentioning

confidence: 85%

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Identifying the origin of springs in weathered-fractured crystalline aquifers using a hydrogeophysical approach

Kouassi,

Lachassagne,

Mangoua

et al. 2024

Sci Rep

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Over the last few decades, important advances have been made in the development of relevant hydrogeological conceptual models for crystalline aquifers, and notably for weathered-fractured crystalline aquifers. Paradoxically and contrary to other types of aquifers, these researches never aimed at characterizing springs, the places were groundwater naturally outflows from such aquifers. With such an objective, our methodological approach consisted first of a lithological and hydrogeological description of the aquifer system based on borehole data and outcrops in a representative weathered-fractured crystalline aquifer (Daloa, Ivory Coast). Next, electrical resistivity tomography (ERT) has been used (after validating the appropriate inversion method) to provide the imagery of the weathering profile both below the plateaus and in the valleys where the springs outflow. Piezometric and river discharge data were also processed notably to determine the direction of groundwater flow. Results demonstrate unambiguously that the isalterites aquifer supplies the springs, and that the underlying fractured layer is not directly implied in this supply. ERT combined with borehole and field lithological data also shows that the lateritic formations (alloterites) present near surface below the plateaus, as well as the upper part of the isalterites, were eroded in the valleys, but not deep enough to let the fractured layer outcrop. This conceptual model for springs not only provides a basis for characterizing such complex aquifers, but also provides technical guidance for spring catchment and groundwater protection in these crystalline areas.

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Section: Discussionsupporting

confidence: 92%

Section: Methodsmentioning

confidence: 85%

Identifying the origin of springs in weathered-fractured crystalline aquifers using a hydrogeophysical approach

Kouassi,

Lachassagne,

Mangoua

et al. 2024

Sci Rep

View full text Add to dashboard Cite

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La integración de datos geológicos, hidrogeológicos y geofísicos con el fin de identificar los recursos de aguas subterráneas en zonas de basamento granítico (Macizo de Guéra, Chad)

Nouradine,

Schamper,

Valdes

et al. 2024

Hydrogeol J

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In Chad, hard-rock aquifers are the main source of drinking water for the population located on basement areas. In these basement aquifers, and in particular those of the Guéra region, water drilling failure rates remain high despite research on one- and two-dimensional electrical resistivity techniques and lineaments as a means to improve access to the resource, mainly because these techniques are only used on an observational and structural basis to locate fractures. This study combines electrical resistivity tomography (ERT) with geology, hydrogeology and geomorphology, in order to characterise the structure and geometry of the aquifer system, assess borehole productivity and determine the factors controlling it. After validating the large dataset and its representativeness, 315 high- and low-yield wells, of which 41 have complete geophysical datasets, were selected. This large dataset allows a multi-parameter approach to (1) better characterise each facies according to its electrical resistivity and (2) clearly identify the main formations constituting the local conceptual hydrogeological model. The most suitable areas for productive boreholes are characterised by the presence of an overburden of <20 m depth, well-developed weathered and fractured horizons of granites and biotite granites (preferably) containing little or no clay, and a nearby drainage network. The most substantial flow rates are found in the first 30 m of the fissured horizon, below the base of the alterites. The experience gained from the present study will guide future analysis of ERT sections in order to reduce the probability of drilling dry wells.

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Elaboration of a hydrogeological conceptual model by application of electrical resistivity tomography: Case of the Lobo catchment (Centre-Western Côte d'Ivoire)

Cited by 2 publications

References 17 publications

Identifying the origin of springs in weathered-fractured crystalline aquifers using a hydrogeophysical approach

Identifying the origin of springs in weathered-fractured crystalline aquifers using a hydrogeophysical approach

La integración de datos geológicos, hidrogeológicos y geofísicos con el fin de identificar los recursos de aguas subterráneas en zonas de basamento granítico (Macizo de Guéra, Chad)

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