Steady-state freshwater–seawater mixing zone in stratified coastal aquifers

Lu, Chunhui; Chen, Yiming; Zhang, Chang; Luo, Jian

doi:10.1016/j.jhydrol.2013.09.017

Cited by 143 publications

(124 citation statements)

References 52 publications

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“…Lu et al [2011] also found that neglecting layered heterogeneity would lead to the overestimation of the toe penetration length, provided that the inland head boundary remained constant.…”

Section: Si In Heterogeneous Systemsmentioning

confidence: 93%

“…Zeitoun [1998a, 1998b] evaluated heterogeneity effects on the interface position within randomly stratified aquifers (i.e., with horizontal structures), and found that neglecting layered heterogeneities introduced large uncertainty in estimates of the toe position, but had relatively minor influence on calculations of upconing under axisymmetric conditions. Lu et al [2011] demonstrated the mixing effects of stratified heterogeneities. They considered SI in a system with a low permeability aquifer layer overlying a higher-permeability layer, presenting results of laboratory experiments and numerical simulations.…”

Section: Si In Heterogeneous Systemsmentioning

confidence: 97%

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Seawater intrusion processes, investigation and management: Recent advances and future challenges

Werner

Bakker

Post

et al. 2013

Advances in Water Resources

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“…Lu et al [2011] also found that neglecting layered heterogeneity would lead to the overestimation of the toe penetration length, provided that the inland head boundary remained constant.…”

Section: Si In Heterogeneous Systemsmentioning

confidence: 93%

Section: Si In Heterogeneous Systemsmentioning

confidence: 97%

Seawater intrusion processes, investigation and management: Recent advances and future challenges

Werner

Bakker

Post

et al. 2013

Advances in Water Resources

Self Cite

1,205

666

View full text Add to dashboard Cite

“…Models for the mixing zone historically used a simple sharp interface (Verruijt 1968). Modern approximations are based on density-dependent miscible systems which account for variable density mixing zones (Abarca and Clement 2009;National Water Commission 2012;Diersch 2014;Lu 2011;Lu et al 2013;Werner et al 2013). The width of the mixing zone can be highly variable, from millimeters in laboratory-based experiments (Abarca and Clement 2009), to kilometers in field-scale examples.…”

Section: Background: the Seawater Interfacementioning

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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“…These authors rely on computational analyses performed on a single three-dimensional realization, invoking ergodic assumptions. Lu et al (2013) performed a set of laboratory experiments and numerical simulations to investigate the effect of geological stratification on SW-FW mixing. Riva et al (2015) considered the same setting as in Abarca et al (2007) and studied the way quantification of uncertainty 30 associated with SWI features is influenced by lack of knowledge of four key dimensionless parameters controlling the process, i.e.…”

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confidence: 99%

Groundwater withdrawal in randomly heterogeneous coastal aquifers

Siena¹,

Riva²

2017

Preprint

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Abstract.We analyze the combined effects of aquifer heterogeneity and pumping operations on seawater intrusion (SWI) in coastal aquifers, a phenomenon which is threatening Mediterranean and worldwide regions. We conceptualize the aquifer as a three-dimensional randomly heterogeneous porous medium, where the spatial distribution of permeability is uncertain. The geological setting of our study is patterned after the coastal aquifer of the Argentona river basin, in the Maresme region of 10 Catalonia (Spain). Numerical simulations of transient, three-dimensional, variable-density flow and solute transport are performed within a stochastic Monte Carlo framework. We consider a variety of groundwater withdrawal schemes, designed by varying the screen location along the vertical direction and the distance of the wellbore from the coastline and from the freshwater-saltwater mixing zone, in order to assess the impact of the pumping scenario on the contamination of the freshwater pumping well for a prescribed production rate. SWI is analyzed by examining isoconcentration curves and global 15 dimensionless quantities characterizing (i) inland penetration of the saltwater wedge and (ii) width of the mixing zone. Our results indicate that heterogeneity affects the (three-dimensional) seawater wedge either in the presence or in the absence of pumping, by reducing toe penetration and enlarging the width of the mixing zone. Simultaneous extraction of fresh and saltwater from two screens along the same wellbore located within the transition zone is effective in limiting SWI during groundwater resources exploitation. 20

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Steady-state freshwater–seawater mixing zone in stratified coastal aquifers

Cited by 143 publications

References 52 publications

Seawater intrusion processes, investigation and management: Recent advances and future challenges

Seawater intrusion processes, investigation and management: Recent advances and future challenges

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

Groundwater withdrawal in randomly heterogeneous coastal aquifers

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