Identification of the Saline Zone in a Coastal Aquifer Using Electrical Tomography Data and Simulation

Koukadaki, Maria A.; Karatzas, George P.; Papadopoulou, Maria P.; Vafidis, A.

doi:10.1007/s11269-006-9135-y

Cited by 59 publications

(38 citation statements)

References 17 publications

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“…Examples of ERI applied for mapping seawater intrusion are presented for transects parallel, or perpendicular to the coastline (Abdul Nassir et al 2000;de Franco et al 2009;Koukadaki et al 2007;Pidlisecky et al 2016;Wilson et al 2006). Transects that run parallel to the coastline will not provide any specific geometry of the seawater interface, however may still provide some useful information (e.g., Pidlisecky et al 2016).…”

Section: Figmentioning

confidence: 99%

Electrical Resistivity Imaging and the Saline Water Interface in High-Quality Coastal Aquifers

2018

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Population growth and changing climate continue to impact on the availability of natural resources. Urbanization of vulnerable coastal margins can place serious demands on shallow groundwater. Here, groundwater management requires definition of coastal hydrogeology, particularly the seawater interface. Electrical resistivity imaging (ERI) appears to be ideally suited for this purpose. We investigate challenges and drivers for successful electrical resistivity imaging with field and synthetic experiments. Two decades of seawater intrusion monitoring provide a basis for creating a geo-electrical model suitable for demonstrating the significance of acquisition and inversion parameters on resistivity imaging outcomes. A key observation is that resistivity imaging with combinations of electrode arrays that include dipole-dipole quadrupoles can be configured to illuminate consequential elements of coastal hydrogeology. We extend our analysis of ERI to include a diverse set of hydrogeological settings along more than 100 km of the coastal margin passing the city of Perth, Western Australia. Of particular importance are settings with: (1) a classic seawater wedge in an unconfined aquifer, (2) a shallow unconfined aquifer over an impermeable substrate, and (3) a shallow multi-tiered aquifer system over a conductive impermeable substrate. We also demonstrate a systematic increase in the landward extent of the seawater wedge at sites located progressively closer to the highly urbanized center of Perth. Based on field and synthetic ERI experiments from a broad range of hydrogeological settings, we tabulate current challenges and future directions for this technology. Our research contributes to resolving the globally significant challenge of managing seawater intrusion at vulnerable coastal margins.

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Section: Figmentioning

confidence: 99%

Electrical Resistivity Imaging and the Saline Water Interface in High-Quality Coastal Aquifers

2018

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“…2. A preliminary work by Koukadaki et al (2007), focusing on the estimation of hydraulic conductivity obtained from field measurements of electrical resistivity, provided the geological mapping of the area, where fractures, karstified and non-karstified geological formations occur (Fig. 3).…”

Section: Site Descriptionmentioning

confidence: 99%

“…The longitudinal and transverse dispersivity were set to 50 and 5 m, respectively, based on model calibration. The spatial distribution of the hydraulic conductivity obtained from Koukadaki et al (2007) and used in the model is presented in Fig. 6.…”

Section: Additional Parametersmentioning

confidence: 99%

“…According to this methodology, the physical system consists of two completely immiscible fluids with different constant densities (fresh and saline water) that form a mixing zone that is limited to an interface with a small finite width (Reilly and Goodman 1985). This approach has been applied and extended by many researchers such as: Mahesha and Nagaraja (1996), Dagan and Zeitoun (1998), Naji et al (1998), Guvanasen et al (2000), Brunke and Schelkes (2001), Mantoglou (2003), Mantoglou et al (2004), Ababou and Al-Bitar (2004), Karterakis et al (2007), Koukadaki et al (2007), Papadopoulou et al (2010a) and Papadopoulou et al (2010b). The interested reader is directed to Reilly and Goodman (1985) and Diersch and Kolditz (2002) for an extensive review of works utilizing the sharpinterface approach.…”

Section: Introductionmentioning

confidence: 99%

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Saltwater intrusion estimation in a karstified coastal system using density-dependent modelling and comparison with the sharp-interface approach

Dokou

Karatzas

2012

Hydrological Sciences Journal

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in a karstified coastal system using density-dependent modelling and comparison with the sharp-interface approach. Hydrological Sciences Journal, 57 (5), 985-999.Abstract Saltwater intrusion is a naturally occurring phenomenon that is exacerbated significantly by excessive groundwater exploitation in coastal aquifers. In order to determine the extent of saltwater intrusion in a karstified coastal aquifer in Crete, Greece, a three-dimensional, density-dependent groundwater flow and transport model was developed and compared to the more traditional sharp-interface approach. The karstified medium was modelled using a combination of the equivalent porous medium approach (for lower-order fractures) and a discrete fracture approach (for the main fractures/faults). The model takes into consideration the geomorphologic characteristics of the karstic system, such as the depth and orientation of the fault network, and the diffusion phenomena associated with the variable densities of freshwater and saltwater-parameters that create a complex system, inducing uncertainty in the model. The model results showed that the orientation of the fractures, the pumping activity and the fluid density effects drive the seawater intrusion front asymmetrically inland.

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“…Geophysical methods for the subsurface investigation can contribute to the coastal surface and ground water characterization, see for example [1]- [5]: Balia et al [6] studied water salinization at the Muravera plain in southern Sardinia, Italy by applying a combination of geophysical techniques. Batayneh [7] made a new study for detecting subsurface fresh and saline water in the eastern Dead Sea coastal aquifers in Jordan utilizing electrical resistivity methods while Koukadaki et al [8] used integrated geophysical observations and analysis to characterize the hydrogeology of a coastal aquifer. Geoelectric methods were applied to monitor seawater intrusion in different parts of the world (as in [9]- [12]).…”

Section: Introductionmentioning

confidence: 99%

Saltwater Intrusion in Jizan Coastal Zone, Southwest Saudi Arabia, Inferred from Geoelectric Resistivity Survey

Mogren¹

2015

IJG

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This work focuses on the causes of water quality deterioration in the coastal plain of Jizan area, southwest Saudi Arabia using vertical electrical sounding (VES) surveys. Schlumberger electrode array is used in the study with the current electrode spacing ranging from 400 to 600 m to delineate the thickness of the shallow aquifer and its possible interaction with the sea water. The differences in resistivity are associated with the variations in lithology and groundwater saturation and salinity. The interpretation of VES curves reveals low resistivity zones characterizing the study area. These zones reflect saline water intrusion in the coastal aquifer. Generally, it is observed that the resistivity of saturated zone decreases towards the sea, indicating the influence of seawater. Based on the interpretation of the constructed resistivity pseudo-sections and 1-D sequential inversion models, three factors are identified to control the seawater intrusion into the shallow groundwater aquifers: 1) presence of faults that contribute extensively in the seawater intrusion as the seawater invades the coastal aquifers through the crushed rocks in fault zones related to the Red Sea rifting, 2) over-withdrawal of groundwater from the coastal aquifers, resulting in saline water intrusion from the sea into the freshwater aquifer, and 3) the lithological variation where the alluvial sediments of the ancient buried wadi (dry valley) channels provide potential pathways for saltwater intrusion and make a hydraulic connection between the aquifer and the sea water.

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Identification of the Saline Zone in a Coastal Aquifer Using Electrical Tomography Data and Simulation

Cited by 59 publications

References 17 publications

Electrical Resistivity Imaging and the Saline Water Interface in High-Quality Coastal Aquifers

Electrical Resistivity Imaging and the Saline Water Interface in High-Quality Coastal Aquifers

Saltwater intrusion estimation in a karstified coastal system using density-dependent modelling and comparison with the sharp-interface approach

Saltwater Intrusion in Jizan Coastal Zone, Southwest Saudi Arabia, Inferred from Geoelectric Resistivity Survey

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