Simulation of Groundwater Flow in a Sedimentary Aquifer System Subjected to Overexploitation

Kallioras, Andreas; Pliakas, F.; Diamantis, I.

doi:10.1007/s11270-009-0291-6

Cited by 22 publications

(7 citation statements)

References 23 publications

(21 reference statements)

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“…A full description of the code is given by Kemna (2000). In the inversion, the data errors are represented according to a linear model expressed as ε = a/R +b, where R is the measured electrical resistance.…”

Section: Data Processing and Time-lapse Ert Inversionmentioning

confidence: 99%

“…The most common situation where saline-freshwater systems have practical environmental and socio-economic implications is related to seawater intrusion in coastal aquifers, often exacerbated by overexploitation of groundwater, particularly in arid and semi-arid regions such as those surrounding the Mediterranean basin (e.g., Kallioras et al, 2010;Rey et al, 2013;Dentoni et al, 2015). Another context where the study of saline-freshwater interactions is highly important is the injection and storage of freshwater in brackish or salty aquifers for later use in agriculture or for domestic purposes, also known as aquifer storage and recovery (ASR; e.g., Pyne, 1995;Dillon, 2005).…”

Section: Introductionmentioning

confidence: 99%

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Flow dynamics in hyper-saline aquifers: hydro-geophysical monitoring and modeling

Haaken

Deidda

Cassiani

et al. 2017

Hydrol. Earth Syst. Sci.

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Abstract. 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.

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Section: Data Processing and Time-lapse Ert Inversionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Flow dynamics in hyper-saline aquifers: hydro-geophysical monitoring and modeling

Haaken

Deidda

Cassiani

et al. 2017

Hydrol. Earth Syst. Sci.

View full text Add to dashboard Cite

show abstract

“…The ERT field data from the freshwater injection experiment were inverted using the smoothness-constraint inversion code CRTomo. A full description of the code is given by Kemna (2000). In the inversion, the data errors are represented according to a linear model expressed as ε = a/R +b, where R is the measured electrical resistance.…”

Section: Data Processing and Time-lapse Ert Inversionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Flow dynamics in hyper-saline aquifers: hydro-geophysical monitoring and modelling

Haaken¹,

Deidda²,

Cassiani³

et al. 2016

Preprint

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Abstract. 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 modelled. 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 modelling components of a methodology aimed at understanding complex saline-freshwater systems. The methodology 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 3D 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, not surprisingly, by the system's very mild hydraulic heterogeneities. The study highlights the value of the ERT field data at imaging the freshwater bulb behavior, as well the value of the modelling results at interpreting these data. Further steps towards a quantitative integration of monitoring and modelling tools are discussed.

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“…Main environmental processes occurring under aquifer overexploitation conditions include groundwater table drawdown, subsidence, attenuation and drying of springs, decrease of river flow and increased pollution vulnerability (Esteller and Diaz-Delgado 2002). Groundwater overexploitation situations are present at global scale (Bromley et al 2001;Changming et al 2001;Dijon and Custodio 1992;Esteller and Diaz-Delgado 2002;Hani et al 2006;Johnson 1993;Kallioras et al 2010;Kouzana et al 2009;Ma et al 2011;Uchuya 1993). In Italy groundwater overexploitation situations are evident, especially in coastal aquifers (Alberti et al, 2009;Ambrosio et al 2009;Avanzini et al 1997;Barazzuoli et al 2008;Ghiglieri et al 2012;Licciardello et al 2011;Lugoli et al 2011;Righini et al 2011;Sappa et al 2005;Tulipano and Fidelibus 2002).…”

Section: -Introductionmentioning

confidence: 99%

Simulation modelling for groundwater safety in an overexploitation situation: the Maggiore Valley context (Piedmont, Italy)

Lasagna

Caviglia

Luca

2014

Bull Eng Geol Environ

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The Maggiore Valley well field plays a fundamental role in supplying drinking water to a large territory of the Piedmont (North-western Italy). However an increasing water demand have led to the overexploitation of groundwater resources: this situation caused a progressive drawdown of the piezometric level (locally up to 0.8 m/year), a spatial reduction of the artesian zone, a local land subsidence and well damages. The main intent of this study is the development of a groundwater flow model of the area for analyzing the aquifer response to various pumping strategies. The groundwater flow simulation, achieved by the application of the MODFLOW code, was calibrated satisfactorily. Then the groundwater response to four scenarios was simulated, in order to suggest the best option to mitigate the problem. In three cases a withdrawal decrease of 110 l/s has been simulated, considering or not the re-location of some wells out of the well field zone of influence; moreover a significant withdrawal reduction of 150 l/s, as a result of the possible connection with the water supply of the Monferrato Aqueduct, located north of the study area, was simulated. All the simulations provide an increase of the piezometric level, even up to 30 m. Nevertheless the most promising management strategy for the Maggiore Valley well field is the connection with Monferrato Aqueduct: indeed the piezometric level rises up to 25 m without the necessity of drilling of new wells.

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Simulation of Groundwater Flow in a Sedimentary Aquifer System Subjected to Overexploitation

Cited by 22 publications

References 23 publications

Flow dynamics in hyper-saline aquifers: hydro-geophysical monitoring and modeling

Flow dynamics in hyper-saline aquifers: hydro-geophysical monitoring and modeling

Flow dynamics in hyper-saline aquifers: hydro-geophysical monitoring and modelling

Simulation modelling for groundwater safety in an overexploitation situation: the Maggiore Valley context (Piedmont, Italy)

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