The Donga Department is located in the northwest of Benin in an area made up of crystalline and crystallophyllic basement rocks where most of the groundwater resources are found in the area of weathered and conductive fractures. The carrying out of drilling campaigns in this department are often crowned with a significant number of negative boreholes (<0.7m3 /h) due to the poor choice of sites for drilling. This leads to situations of difficulties in supplying drinking water, or even more frequent shortages during the dry season. The objective of this study is to use geophysical methods characterize the fractured basement areas, with a view to improving the implantations and the sustainable management of the aquifers they contain. The application of the Protonic Magnetic Resonance (PMR) method made it possible to determine the hydrogeological properties of the fracture zones. As a result, the determination of the hydrodynamic properties shows that the WPMR, T2* and Sy values in 5 different localities of the study area are between 4 and 13% respectively, between 150 and 212.5 ms and between 2.3 and 8.2%. The minimum height of the water slide is 820 mm and the maximum height is estimated at 3672 mm for a water reserve of up to 2313 mm in the Donga gneisses. It emerges from this study that in the department of Donga the PMR water content is also a function of the particle size. T2* of the fractured zone.
YALO NICAISE (2000). Geological and geophysical models of the Gulf of Benin and detection of tectonic dislocations in seismic data. PhD thesis PhD of the Moscow State Academy of Geological Prospecting (Russia) UDK 552.082.536. 128p.
.NAKOLENDOUSSE, S., SAVADOGO N. A. & ROULEAU A., 1993. The factors of productivity of crystalline basement aquifers in Burkina Faso: the example of Pobé-Mengao, pp. 95-107. in J. M. Dubois, F. Cavayas and P. Lafrance (eds). Remote sensing applied to thematic and topographic mapping, collection. Univ. of France, PUQ, Ed. AUPELF UREF, 422.
SALEY M. B. (2003). System of spatially referenced information, pseudo-image discontinuities and thematic mapping of water resources in the semi-mountainous region of Man (western Côte d'Ivoire). Single PhD thesis, University of Cocody, 209p.
YOUAN TA M., YAO K.A.F., BAKA D., DE LASM Z.O., LASM T., ADJA M.G., KOUAKOU S., ONETIE Z.O., JOURDA J.P.R., BIEMI J. (2015). Mapping of potential zones for the implementation of high-flow drilling in fissured media by multi-criteria analysis: Case of the department of Oumé (central-western Côte d'Ivoire). Larhyss Journal 23, p. 155-181.
ANTONAKOS, A., VOUDOURIS, K., LAMBRAKIS, N., 2014. Site selection for drinking-water pumping boreholes using a fuzzy spatial decision support system in the Korinthia prefecture, SE Greece. Hydrogeol. J. 22, 1763–1776.
OIKONOMIDIS, D., DIMOGIANNI, S., KAZAKIS, N., VOUDOURIS, K., 2015. A GIS/remote sensing based methodology for groundwater potentiality assessment in Tirnavos area, Greece. J. Hydrol. 525, 197–208. DOI: 10.1016/j.hydrol.2015.03.056
GUPTA, M., SRIVASTAVA, P.K., 2010. Integrating GIS and remote sensing foridentification of groundwater potential zones in the hilly terrain of Pavagarh, Gujarat, India. Water Int. 35, 233–245.
JHARIYA, D. C., TARUN, K., GOBINATH, M., PRABHAT, D. AND NAWAL, K., 2016. Assessment of Groundwater Potential Zone Using Remote Sensing, GIS and Multi Criteria Decision Analysis Techniques. J. geol. Soci. of India Vol.88, 481-492
JOURDA J. P. (2005). Methodology for the Application of Remote Sensing Techniques and Geographic Information Systems to the Study of Fractured Aquifers in West Africa. Concept of spatial hydrotechnics: the case of test zones in Côte d'Ivoire. PhD thesis, University of Cocody, 430 p.
YOUAN TA. M., LASM T., JOURDA J. P., SALEY B. M., ADJA M. G., KOUAME K. AND BIEMI J. (2011). Groundwater mapping in fissured environment by multi-criteria analysis Case of Bondoukou (Ivory Coast). International Journal of Geomatics, 2011, 21 (1), p. 43- 71.
SORO D. D. (2017). Characterization and hydrogeological modelling of an aquifer in a fractured basement environment: case of the Sanon experimental site (central plateau region in Burkina Faso), PhD thesis, Univ. Pierre et Marie Curie-Paris 6 and 2iE, 287p.
VOUILLAMOZ J-M., LAWSON F.M.A., YALO N., DESCLOITRES M. (2014). The use of magnetic resonance sounding for quantifying specific yield and transmissivity in hard rock aquifers: The example of Benin. Journal of Applied Geophysics 107, p.16-24
ALLE I. C., DESCLOITRES M., VOUILLAMOZ JM., YALO N., LAWSON F.M.A., ADIHOU A. C., (2018). Why 1D electrical resistivity techniques can result in inaccurate siting of boreholes in hard rock aquifers and why electrical resistivity tomography must be preferred: the example of Benin, West Afric, Journal of African Earth Sciences 139, p. 341-353.
AKOKPONHOUE Bertrand (2019). Contribution of remote sensing, geographical information systems and geophysical methods in the exploration of fracture aquifers in the Donga department (north-western Benin). PhD thesis of the University of Abomey-Calavi. 246p.
AFFATON P. (1987). The volta basin (West Africa): a passive margin of the Upper Proterozoic tectonized Pan-African. State Thesis, vol. 2, Université Aix-Marseille III, 462p.
CAEN-VACHETTE M., PINTO K.J.M., ROQUES M. (1979). Eburnean plutons and metamorphism in the crystalline basement of the Pan-African chain in Togo and Benin. Review of Geological Dynamics Physical Geography, 21, p.351-357.
BOUSSARI, W.T., 1975. Contribution to the geological study of the crystalline basement of the Pan-African mobile zone (Central Region of Dahomey), PhD thesis, Univ. of Besançon, 105p..
LASM T., YOUAN TA M., BAKA D., DE LASME O., JOURDA J. P., KOUAME F. K., YAO T. K., KOUADIO K. E., YAO F. A. (2014). Fractures networks organization on Precambrian basement of Côte d’Ivoire: statistical and geostatistical approaches. International Journal of Emerging Techn. and Advanced Engineering Vol. 4, p. 1-10.
LACHASSAGNE P., WYNS R., DEWANDEL B. (2011). The fracture permeability of hard rock aquifer is due neither to tectonics, nor to unloading, but to weathering processes. Terra Nova, 23, p.145-161.
DEWANDEL B., LACHASSAGNE P., WYNS R., MARECHAL J.C., & KRISHNAMURTHY N.S. (2006). A generalized 3-D geological and hydrogeological conceptual model of granite aquifers controlled by single or multiphase weathering. Journal of Hydrology, 330 (1-2), p. 260-284.
WYNS R., QUESNEL, F., SIMON-COINÇON, R., GUILLOCHEAU, F., & LACQUEMENT F. (2003). Major weathering in France related to lithospheric deformation. Géologie de France, 1, 79–87.
LANGSDORF W. (1971). Possibilities of groundwater exploitation in weathered schistose and crystalline structures in Dahomey/West Africa. Naehr. dtschegeol, Gesellrch, Dtsch. 1971 No. 4, tral. part. p. 82, Trad. ERGM, No. 5479.
BOUKARI M. (1982). Contribution to the hydrogeological study of the basement regions of intertropical Africa: the hydrogeology of the Dassa-Zoumè region (Benin). PhD thesis, University of Dakar. 173p
BOUKARI M., AKITI T.T. AND ASSOMA D. (1984). The hydrogeology of West Africa. Synthesis of the knowledge of ancient crystalline and crystallophyllitic and sedimentary basement, 2nd edition, 147p.
SAVADOGO A. N. (1984). Geology and hydrogeology of the crystalline basement of Upper Volta. Regional study of the Sissil catchment area. Thesis Doctorate ès Sci. D., Univ. Grenoble 1, Inst. Dolomieu, 350p.
BIEMI J. (1992). Contribution to the geological, hydrogeological and remote sensing study of sub-Sahelian catchments of the Precambrian basement of West Africa: Hydrostructural, hydrodynamic, hydrochemical and isotopic studies of discontinuous aquifers of furrows and granitic areas of the Haute Marahoué (Côte d'Ivoire). PhD thesis. ès Sc. Nat., University, Abidjan, 493p.
KOUAME K. F. (1999). Hydrogeology of discontinuous aquifers in the semi-mountainous region of Man-Danané (Western Côte d'Ivoire). Contribution of satellite image data and statistical and fractal methods to the development of a spatially referenced hydrogeological information system. 3rd cycle thesis, Univ. Cocody-Abidjan, (Ivory Coast), 194 pp.
LASM T. (2000). Hydrogeology of fractured basement reservoirs: Statistical and geostatistical analyses of fracturing and hydraulic properties. Application to the mountain region of Côte d'Ivoire (Archean Domain). Single PhD thesis University of Poitier, 272p.
BOUCHER M. (2007). Estimation of the hydrodynamic properties of aquifers by proton magnetic resonance in different geological contexts, from sample to hydrogeological scale. PhD thesis, University of Orleans, France, 199p
CHALIKAKIS K. (2006). Application of geophysical methods for recognition and protection of water resources in karst environments. PhD thesis, Pierre and Marie Curie University - Paris 6, France, 212p.
LUBCZYNSKI MW. ET ROY J. (2007). Use of MRS for hydrogeological system parameterization and modeling. Boletín Geológico y Minero 118 (3), p. 509-530.
SCHIROV M., LEGCHENKO A., CREER G. (1991). A new direct non-invasive groundwater detection technology for Australia. Explo. Geophysics 22 (2), p. 333-338.
LEGCHENKO A., EZERSKY M., GIRARD JF., BALTASSAT JM., BOUCHER M., CAMERLYNCK C., AL-ZOUBI A. (2008). Interpretation of magnetic resonance soundings in rocks with high electrical conductivity. Journal of Applied Geophysics 66 (3), p.118–127.
HECTOR B., SEGUIS L., HINDERER J., DESCLOITRES M., VOUILLAMOZ J.-M., WUBDA M., BOY J.-P., LUCK B., MOIGNE N.L. (2013). Gravity effect of water storage changes in a weathered hard-rock aquifer in West Africa: results from joint absolute gravity, hydrological monitoring and geophysical prospection. Geophys. J. Int. 194, p. 737-750.
VOUILLAMOZ JM. (2003). Aquifer characterization by a non-invasive method: proton magnetic resonance soundings. PhD thesis, Université Paris Sud - Paris XI, France. 236p.
VOUILLAMOZ J-M., LAWSON F.M.A., YALO N., DESCLOITRES M. (2015). Groundwater in hard rocks of Benin: Regional storage and buffer capacity in the face of change. Journal of Hydrology 520, p.379-386.