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Contribution of Electrical Resistivity Tomography and Boring Technique in the Realization of Ten (10) Large Boreholes in a Crystalline Basement Rocks in the Centre-West of Benin

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Journal of Geoscience and Environment Protection 2019年第9期7卷 114-130页

作者： Nesny Yanonvoh akokponhoué Nicaise Yalo bertrand houngnigbo akokponhoué Rita Houngue George Agbahoungba Chaire Internationale en Physique Mathématique et Applications (CIPMA Chaire UNESCO) Université d’Abomey-Calavi Cotonou Benin Laboratoire d’Hydrologie Appliqué Institut National de l’Eau (INE) Université d’Abomey-Calavi Cotonou Benin Société d’Ingénierie et d’Expertise (CANAL-EAU BENIN) Cotonou Benin

In order to ensure access to drinking water for Benin populations by 2021, the Emergency Measure program for the reinforcement of the drinking water supply system of Savalou city was initiated in 2018. This program focuses on densification and extension of hydraulic infrastructures. Therefore, it is prominent to use rigorous approach for implementation and execution of drilling activities. The present work has the advantage of combining the use of electrical resistivity tomography and borehole technique to locate ten high flow drilling in Savalou city. The electrical resistivity tomography (ERT) panels were made based on the dipole-dipole arrays with 48 electrodes with 5 m inter-electrode spacing. The drilling was carried out over ten selected points and in two stages: confirmation test using piezometer and borehole diameter enlargement. Moreover, only piezometers with flow rate greater than 10 m3/h were enlarged. The tomography processing has identified 10 fractured zones that are defined by 250 - 1000 ohm.m resistivity values and a width between 15 - 55 m. The confirmation test carried out over ten piezometers exhibits high flow rates ranging from 9 to 35 m3/h with depths of 30 to 68 m. Nine over the ten boreholes with a flow rate equal or greater than 10 m3/h, have improved their flow rates by 50% to 100% after the boring technique. Thus, the cumulative flow rate has reached 252. 7 m3/h for Savalou city and his surrounding areas.

关键词： Boring Technique Electrical Resistivity Tomography Fractures Savalou

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