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Erratum published on 16 June 2017, see Water 2017, 9(6), 435.

Open AccessArticle
Water 2017, 9(2), 95; doi:10.3390/w9020095

Borehole Logging and Slug Tests for Evaluating the Applicability of Electrical Resistivity Tomography for Groundwater Exploration in Nampula Complex, Mozambique

1
Engineering Geology, Lund University, Box 118, S-221 00 Lund, Sweden
2
Geology Department, Eduardo Mondlane University, Av. Mozambique km 1.5, P.O. Box 273, Maputo, Mozambique
*
Author to whom correspondence should be addressed.
Academic Editors: Arjen Y. Hoekstra and Trevor Elliot
Received: 8 December 2016 / Revised: 21 January 2017 / Accepted: 3 February 2017 / Published: 8 February 2017
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Abstract

In Nampula province, Mozambique, there is a high number of water wells considered as having failed for having too low a pumping yield. Two Electrical Resistivity Tomography (ERT) measurement campaigns were conducted in the area for evaluating the reasons of failures. However, in some cases it was difficult to verify and interpret the ERT results by only using the inadequate lithological description presented in drilling reports. In this paper the integration of borehole logging and slug testing is presented as a solution to add more information and to enhance the interpretation of ERT models. The borehole logging tool measured resistivity, magnetic susceptibility and natural gamma. The logging results proved that the ERT models are accurate in estimating the resistivity for basement (>1400 Ωm), fractured layer (220–1400 Ωm), semi-weathered layer with clay accumulation (10–220 Ωm), and weathered and leached layer (220–2700 Ωm). The slug testing gave results of high hydraulic conductivity (K) values where the ERT indicates well-developed weathered and fractured layers, and low K values where these are less developed. The borehole interpretation can be extrapolated using the ERT model to give a geometric characterization of the aquifer. Therefore, the implementation of the ERT method in groundwater exploration is encouraged. View Full-Text
Keywords: Electrical Resistivity Tomography; borehole logging; slug test; hydraulic conductivity; groundwater; hard rock aquifer Electrical Resistivity Tomography; borehole logging; slug test; hydraulic conductivity; groundwater; hard rock aquifer
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MDPI and ACS Style

Chirindja, F.; Rosberg, J.-E.; Dahlin, T. Borehole Logging and Slug Tests for Evaluating the Applicability of Electrical Resistivity Tomography for Groundwater Exploration in Nampula Complex, Mozambique. Water 2017, 9, 95.

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