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Article

Improving the Methods for Processing Hard Rock Aquifers Boreholes’ Databases. Application to the Hydrodynamic Characterization of Metamorphic Aquifers from Western Côte d’Ivoire

1
UFR-STRM, Université Félix Houphouët-Boigny, 22 BP 582, Abidjan 22, Côte d’Ivoire
2
HSM, Univ. Montpellier, CNRS, IRD, Montpellier, France
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BRGM, Univ. Montpellier, 34000 Montpellier, France
4
G-eau, UMR 183, INRAE, CIRAD, IRD, AgroParisTech, Supagro, BRGM, 34000 Montpellier, France
*
Author to whom correspondence should be addressed.
Academic Editor: Sappa Giuseppe
Water 2021, 13(22), 3219; https://doi.org/10.3390/w13223219
Received: 10 September 2021 / Revised: 5 November 2021 / Accepted: 8 November 2021 / Published: 13 November 2021
(This article belongs to the Special Issue Groundwater Sustainable Exploitation)
Statistical analysis of a borehole database, linear discharges, and water strikes processing enabled an understanding of the structure, geometry and hydrodynamic properties of the metamorphic hard rock aquifers from the Montagnes District, Western Côte d’Ivoire. The database comprises 1654 boreholes among which 445 only were usable for this research work after its pre-processing. Analysis shows that the structure of the aquifer is similar to that observed in several other areas in the world: it developed due to weathering processes, comprises the capacitive saprolite, 10–20 m thick on average, and an underlying transmissive fractured layer, overlying the unweathered impermeable hard rock. The fractured layer is 80 m thick, the first 40 to 45 metres being its most productive zone, with a 11.3 m3/h median productivity. This research shows that metamorphic aquifers exhibit similar aquifer properties (thickness, hydrodynamic parameters) as plutonic ones and that there is interest in using such databases for research and other purposes. However, a rigorous pre-treatment of the data is mandatory, and geological data from published maps must be used instead of the geological data from the database. A previous methodology aiming at processing the boreholes’ linear discharges was improved. It notably appears that the slope method must be preferred to the percentile method. View Full-Text
Keywords: groundwater; hydrogeological conceptual model; linear discharge; saprolite; mining impacts; water strike; weathered fractured layer groundwater; hydrogeological conceptual model; linear discharge; saprolite; mining impacts; water strike; weathered fractured layer
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MDPI and ACS Style

Aoulou, K.A.; Pistre, S.; Oga, Y.M.S.; Dewandel, B.; Lachassagne, P. Improving the Methods for Processing Hard Rock Aquifers Boreholes’ Databases. Application to the Hydrodynamic Characterization of Metamorphic Aquifers from Western Côte d’Ivoire. Water 2021, 13, 3219. https://doi.org/10.3390/w13223219

AMA Style

Aoulou KA, Pistre S, Oga YMS, Dewandel B, Lachassagne P. Improving the Methods for Processing Hard Rock Aquifers Boreholes’ Databases. Application to the Hydrodynamic Characterization of Metamorphic Aquifers from Western Côte d’Ivoire. Water. 2021; 13(22):3219. https://doi.org/10.3390/w13223219

Chicago/Turabian Style

Aoulou, Kouassi A., Severin Pistre, Yéï M.S. Oga, Benoît Dewandel, and Patrick Lachassagne. 2021. "Improving the Methods for Processing Hard Rock Aquifers Boreholes’ Databases. Application to the Hydrodynamic Characterization of Metamorphic Aquifers from Western Côte d’Ivoire" Water 13, no. 22: 3219. https://doi.org/10.3390/w13223219

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