Flow dynamics in hyper-saline aquifers: hydro-geophysical monitoring and modeling
Saline–freshwater interaction in porous media is a phenomenon of practical interest particularly for the management of water resources in arid and semi-arid environments, where precious freshwater resources are threatened by seawater intrusion and where storage of freshwater in saline aquifers can b...
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doaj-d07ba77aee5a46688b17193a650eaf062020-11-25T00:15:32ZengCopernicus PublicationsHydrology and Earth System Sciences1027-56061607-79382017-03-012131439145410.5194/hess-21-1439-2017Flow dynamics in hyper-saline aquifers: hydro-geophysical monitoring and modelingK. Haaken0G. P. Deidda1G. Cassiani2R. Deiana3M. Putti4C. Paniconi5C. Scudeler6A. Kemna7Department of Geophysics, Steinmann Institute, University of Bonn, Meckenheimer Allee 176, 53115 Bonn, GermanyDipartimento di Ingegneria Civile, Ambientale e Architettura, Università di Cagliari, Via Marengo 2, 09123 Cagliari, ItalyDipartimento di Geoscienze, Università di Padova, Via Gradenigo 6, 35131 Padova, ItalyDipartimento di Beni Culturali, Università di Padova, Piazza Capitaniato 7, Palazzo Liviano, 35139 Padova, ItalyDipartimento di Matematica, Università di Padova, Via Trieste 63, 35121 Padova, ItalyInstitut national de la recherche scientifique, Centre Eau Terre Environnement, Université du Québec, Rue de la Couronne 490, G1K 9A9 Québec, CanadaDipartimento di Matematica, Università di Padova, Via Trieste 63, 35121 Padova, ItalyDepartment of Geophysics, Steinmann Institute, University of Bonn, Meckenheimer Allee 176, 53115 Bonn, GermanySaline–freshwater interaction in porous media is a phenomenon of practical interest particularly for the management of water resources in arid and semi-arid environments, where precious freshwater resources are threatened by seawater intrusion and where storage of freshwater in saline aquifers can be a viable option. Saline–freshwater interactions are controlled by physico-chemical processes that need to be accurately modeled. This in turn requires monitoring of these systems, a non-trivial task for which spatially extensive, high-resolution non-invasive techniques can provide key information. In this paper we present the field monitoring and numerical modeling components of an approach aimed at understanding complex saline–freshwater systems. The approach is applied to a freshwater injection experiment carried out in a hyper-saline aquifer near Cagliari (Sardinia, Italy). The experiment was monitored using time-lapse cross-hole electrical resistivity tomography (ERT). To investigate the flow dynamics, coupled numerical flow and transport modeling of the experiment was carried out using an advanced three-dimensional (3-D) density-driven flow-transport simulator. The simulation results were used to produce synthetic ERT inversion results to be compared against real field ERT results. This exercise demonstrates that the evolution of the freshwater bulb is strongly influenced by the system's (even mild) hydraulic heterogeneities. The example also highlights how the joint use of ERT imaging and gravity-dependent flow and transport modeling give fundamental information for this type of study.http://www.hydrol-earth-syst-sci.net/21/1439/2017/hess-21-1439-2017.pdf |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
K. Haaken G. P. Deidda G. Cassiani R. Deiana M. Putti C. Paniconi C. Scudeler A. Kemna |
spellingShingle |
K. Haaken G. P. Deidda G. Cassiani R. Deiana M. Putti C. Paniconi C. Scudeler A. Kemna Flow dynamics in hyper-saline aquifers: hydro-geophysical monitoring and modeling Hydrology and Earth System Sciences |
author_facet |
K. Haaken G. P. Deidda G. Cassiani R. Deiana M. Putti C. Paniconi C. Scudeler A. Kemna |
author_sort |
K. Haaken |
title |
Flow dynamics in hyper-saline aquifers: hydro-geophysical monitoring and modeling |
title_short |
Flow dynamics in hyper-saline aquifers: hydro-geophysical monitoring and modeling |
title_full |
Flow dynamics in hyper-saline aquifers: hydro-geophysical monitoring and modeling |
title_fullStr |
Flow dynamics in hyper-saline aquifers: hydro-geophysical monitoring and modeling |
title_full_unstemmed |
Flow dynamics in hyper-saline aquifers: hydro-geophysical monitoring and modeling |
title_sort |
flow dynamics in hyper-saline aquifers: hydro-geophysical monitoring and modeling |
publisher |
Copernicus Publications |
series |
Hydrology and Earth System Sciences |
issn |
1027-5606 1607-7938 |
publishDate |
2017-03-01 |
description |
Saline–freshwater interaction in porous media is a phenomenon of practical
interest particularly for the management of water resources in arid and
semi-arid environments, where precious freshwater resources are threatened
by seawater intrusion and where storage of freshwater in saline aquifers can
be a viable option. Saline–freshwater interactions are controlled by
physico-chemical processes that need to be accurately modeled. This in turn
requires monitoring of these systems, a non-trivial task for which spatially
extensive, high-resolution non-invasive techniques can provide key
information. In this paper we present the field monitoring and numerical
modeling components of an approach aimed at understanding complex
saline–freshwater systems. The approach is applied to a freshwater injection
experiment carried out in a hyper-saline aquifer near Cagliari (Sardinia,
Italy). The experiment was monitored using time-lapse cross-hole electrical
resistivity tomography (ERT). To investigate the flow dynamics, coupled
numerical flow and transport modeling of the experiment was carried out
using an advanced three-dimensional (3-D) density-driven flow-transport simulator. The simulation
results were used to produce synthetic ERT inversion results to be compared
against real field ERT results. This exercise demonstrates that the
evolution of the freshwater bulb is strongly influenced by the system's (even
mild) hydraulic heterogeneities. The example also highlights how the joint
use of ERT imaging and gravity-dependent flow and transport modeling give
fundamental information for this type of study. |
url |
http://www.hydrol-earth-syst-sci.net/21/1439/2017/hess-21-1439-2017.pdf |
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