IJG  Vol.3 No.3 , July 2012
Geoelectric Investigation for Groundwater Exploration in Yaoundé Area, Cameroon
ABSTRACT
Yaounde zone is originally characterized by the small number of aquifers and bad renewal capacity. Within the frame-work of the emergency program which aims at supplying the city with drinking water, seventeen Vertical Electrical Soundings (VES) were carried out using Schlumberger configuration in parts of Yaounde (latitude 3o- 5oN and longi- tude 11o-13oE) to determine the nature and thickness of aquifer zone and necessary geoelectrical parameters. Four to five geoelectric layers were delineated from the survey area. The first layer is the topsoil and has resistivity values ranging from 13 - 216 Ω·m and thickness is between 0.1 - 6 m. The second layer made up of clay sand and laterite has resistivity values ranging between 23 and 923 Ω·m and thickness ranged from 1 and 40 m. The third and fourth geoelectric layers consisting of clay and gneiss/migmatite with thickness varying from 1.7 - 63.3 m correspond to an aquifer horizon. Resistivity values of the aquifer ranges from 4 to 9215 Ω·m. The study indicates that average depth of the aquifer is 20 m and average thickness of the aquifer is 55 m. Soundings curves suggest several four layered geoelectrical sections KH, KQ, HK type and some five layered sections of the HKH, KHK types. KH type is dominant and can be used as reference for future studies. The resistivity survey reveals that the parameters obtained through interpretation of VES curves corroborate the litho logs of boreholes from the area.

Cite this paper
W. Teikeu, P. Njandjock, T. Ndougsa-Mbarga and T. Tabod, "Geoelectric Investigation for Groundwater Exploration in Yaoundé Area, Cameroon," International Journal of Geosciences, Vol. 3 No. 3, 2012, pp. 640-649. doi: 10.4236/ijg.2012.33064.
References
[1]   E. Atakpo, “Hydrogeological Deductions from Geoelectric Survey in Uvwiamuge and Ekakpamre Communities, Delta State, Nigeria,” International Journal of Physical Sciences, Vol. 4, No. 9, 2009, pp. 477-485.

[2]   W. M. Telford, L. P. Geldart and R. E. Sheriff, “Applied Geophysics,” Cambridge University Press, Cambridge, 1990, 870 p. doi:10.1017/CBO9781139167932

[3]   P. V. Sharma, “Environmental and Engineering Geophysics,” Cambridge University Press, Cambridge, 1997, 475 p. doi:10.1017/CBO9781139171168

[4]   H. Stendal, S. F. Toteu, R. Frei, J. Penaye, U. O. Njel, J. Bassahak, J. Nni, B. Kankeu, V. Ngako and J. V. Hell, “Derivation of Detrital Rutile in the Yaounde Region from the Neoproterozoic Pan-African Belt in Southern Cameroon (Central Africa),” Journal of African Earth Sciences, Vol. 4, No. 4, 2006, pp. 443-458.doi:10.1016/j.jafrearsci.2005.11.012

[5]   H. B. Djeuda-Tchapnga, E. Tanawa, E. Temgoua, J. Siakeu and B. Ngo Massana, “Mode de Circulation, Mécanismes de Recharge et Temps Relatifs de Séjour des eaux des Nappes Souterraines des Altérites du Milieu Cristallin: Cas du Bassin Versant de l’Anga’a, Yaoundé,” Presses Universitaires de Yaoundé, Yaoundé, 1999, pp. 117-126.

[6]   H. B. Djeuda-Tchapnga, E. Tanawa, J. Siakeu and E. Ngnikam, “Décentralisation du Service de l’Appro- visionnement en eau Potable: Les Réalités et les Spécificités du Cameroun,” Proceedings du Séminaire sur la Décentralisation et la Gestion des Ressources Naturelles en Afrique Centrale, Douala, 10-13 Mai 1998, 12 p.

[7]   H. Mvondo, S. W. J. Den Brok and J. Mvondo-Ondoa, “Evidence for Symmetric Extension and Exhumation of Yaounde Nappe (Pan-African Fold Belt, Cameroon),” Journal of African Earth Sciences, Vol. 3, No. 6, 2003, pp. 215-231. doi:10.1016/S0899-5362(03)00017-4

[8]   G. E. Ekodeck and B. V. Kamgang-Kabayene, “L’Al- térologie Normative et ses Applications, Une Expression Particulière de la Pétrologie des Roches Alumino- silicatées du Point de vue de Leur Evolution Super- gène,”Presses Universitaires de Yaoundé, Tome II, 2002, 231 p.

[9]   T. Ngnotué, J. P. Nzenti, P. Barbey and F. M. Tchoua, “The Ntui-Betamba High-Grade Gneisses: A Nordward Extension of the Pan-African Yaounde Gneisses in Cam- eroon,” Journal of African Earth Sciences, Vol. 3, No. 1, 2000, pp. 369-381.

[10]   M. Pirttij?rvi, “Joint Interpretation of Electromagnetic and Geoelectrical Soundings Using 1-D Layered Earth Model, User’s Guide to Version 1.3,” Oulu, 2009, 48 p.

[11]   A. Takounjou-Fouépé, V. V. S. R. Gurunadha, J. N. Ndam, L. N. Sigha and G. E. Ekodeck, “Groundwater Flow Modelling in the Upper Anga’a River Watershed, Yaounde, Cameroon,” African Journal of Environmental Science and Technology, Vol. 3, No. 10, 2009, pp. 341- 352.

[12]   P. Maurizot, “Carte Géologique du Sud-Ouest Cameroun au 1/500000,”BRGM, Orléans, 1986.

 
 
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