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Groundwater flow characterization of an ophiolitic hard-rock aquifer from cross-borehole multi-level hydraulic experiments

Groundwater flow characterization of an ophiolitic hard-rock aquifer from cross-borehole multi-level hydraulic experiments
Groundwater flow characterization of an ophiolitic hard-rock aquifer from cross-borehole multi-level hydraulic experiments
Ophiolitic formations play a critical role in the groundwater resource of numerous countries and areas. Previous studies show that the structural heterogeneities of these rocks, coming from the presence of both different lithological units and multi-scale discontinuities, result in complex hydrogeological features that are not well characterized yet. In particular, there is a need for understanding how these heterogeneities impact the hydrodynamic properties of ophiolitic aquifers and the highly variable chemical composition of the water. To this end, we conduct various kinds of pumping experiments between two boreholes 15 m apart in the ophiolitic formation of the Batin (BA1) site in the wadi Tayin massif of the Sultanate of Oman. Cross-borehole open pumping experiments, as well as multi-level pumping and monitoring hydraulic tests, are performed in conductive zones that were identified from temperature and flowmeter data, but also in low-permeability zones requiring to manage very low pumping flow rates. The collected data are interpreted with a model implementing non-integral flow dimension, leakage and time-dependent pumping flow rates. The considered modeling concepts and the estimated hydrogeological properties show that the multi-directional structural heterogeneities of ophiolitic aquifers are key features that must be considered in future hydrogeological models because they drive the hydraulic responses of these systems.
Cross-borehole hydraulic test, Heterogeneous hydrosystems, Hydraulic property estimation, Multi-level packer pumping experiment, Ophiolitic aquifer, Variable flow-rate model
0022-1694
Lods, Gérard
2f6af429-139b-4f91-9c69-3812cf2b1992
Roubinet, Delphine
48b8adf3-8b8e-42ef-9ea1-587ffa23464d
Matter, Jürg M.
abb60c24-b6cb-4d1a-a108-6fc51ee20395
Leprovost, Richard
d0448934-f2b3-4cc1-a995-cfea29a32945
Gouze, Philippe
5def7b5f-4c27-49b5-88ec-84f079d3b548
Lods, Gérard
2f6af429-139b-4f91-9c69-3812cf2b1992
Roubinet, Delphine
48b8adf3-8b8e-42ef-9ea1-587ffa23464d
Matter, Jürg M.
abb60c24-b6cb-4d1a-a108-6fc51ee20395
Leprovost, Richard
d0448934-f2b3-4cc1-a995-cfea29a32945
Gouze, Philippe
5def7b5f-4c27-49b5-88ec-84f079d3b548

Lods, Gérard, Roubinet, Delphine, Matter, Jürg M., Leprovost, Richard and Gouze, Philippe (2020) Groundwater flow characterization of an ophiolitic hard-rock aquifer from cross-borehole multi-level hydraulic experiments. Journal of Hydrology, 589, [125152]. (doi:10.1016/j.jhydrol.2020.125152).

Record type: Article

Abstract

Ophiolitic formations play a critical role in the groundwater resource of numerous countries and areas. Previous studies show that the structural heterogeneities of these rocks, coming from the presence of both different lithological units and multi-scale discontinuities, result in complex hydrogeological features that are not well characterized yet. In particular, there is a need for understanding how these heterogeneities impact the hydrodynamic properties of ophiolitic aquifers and the highly variable chemical composition of the water. To this end, we conduct various kinds of pumping experiments between two boreholes 15 m apart in the ophiolitic formation of the Batin (BA1) site in the wadi Tayin massif of the Sultanate of Oman. Cross-borehole open pumping experiments, as well as multi-level pumping and monitoring hydraulic tests, are performed in conductive zones that were identified from temperature and flowmeter data, but also in low-permeability zones requiring to manage very low pumping flow rates. The collected data are interpreted with a model implementing non-integral flow dimension, leakage and time-dependent pumping flow rates. The considered modeling concepts and the estimated hydrogeological properties show that the multi-directional structural heterogeneities of ophiolitic aquifers are key features that must be considered in future hydrogeological models because they drive the hydraulic responses of these systems.

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Accepted/In Press date: 1 June 2020
e-pub ahead of print date: 13 June 2020
Published date: 1 October 2020
Keywords: Cross-borehole hydraulic test, Heterogeneous hydrosystems, Hydraulic property estimation, Multi-level packer pumping experiment, Ophiolitic aquifer, Variable flow-rate model

Identifiers

Local EPrints ID: 443163
URI: http://eprints.soton.ac.uk/id/eprint/443163
ISSN: 0022-1694
PURE UUID: eede062a-ebe7-4537-b43c-8e6bc906b04a
ORCID for Jürg M. Matter: ORCID iD orcid.org/0000-0002-1070-7371

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Date deposited: 13 Aug 2020 16:33
Last modified: 26 Nov 2021 06:16

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Contributors

Author: Gérard Lods
Author: Delphine Roubinet
Author: Jürg M. Matter ORCID iD
Author: Richard Leprovost
Author: Philippe Gouze

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