Potential of mixed hydraulic barriers to remediate seawater intrusion

Ebeling, Pia; Händel, Falk; Walther, Marc

doi:10.1016/j.scitotenv.2019.07.284

Cited by 48 publications

(14 citation statements)

References 33 publications

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“…In remediation of seawater intrusion, a combination of positive and negative hydraulic barrier has shown promising results in arid areas as extracted water could be used for injection after treatment. By using 2‐D variable density model for a salinated aquifer and SEAWAT and FloPy model for unconfined aquifer, Ebeling, Händel, and Walther (2019) reported that this study can be feasible when implemented in accordance to local conditions.…”

Section: Groundwater Quality Managementmentioning

confidence: 96%

Groundwater quality

Motlagh

Yang

Saba

2020

Water Environment Research

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Groundwater is a vital component of water supply for residential, industrial, and agricultural purposes. However, many groundwater basins are being used unsustainably and groundwater contamination is a growing water quality problem. Although anthropogenic activities and natural processes have been increasing the contamination in this valuable water resource, several remediation techniques have been developed in the last few decades to reduce these contamination levels. This review paper focuses on the recent studies developed on groundwater pollutions, remediation practices, and groundwater quality management.

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Section: Groundwater Quality Managementmentioning

confidence: 96%

Groundwater quality

Motlagh

Yang

Saba

2020

Water Environment Research

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“…The target concentrations in this study were chosen according to three possible applications for partial desalinated SGW in the above-mentioned regions. Since the injection of desalinated SGW can be a used for managed aquifer recharge to artificially alter the hydraulic gradient in order to reduce or even reverse the process of saltwater intrusion [40,41], the first target concentration was set to be close to the local fresh groundwater quality [42]. The second and third target concentrations were chosen according to the recommended target concentrations for irrigation [13] and drinking water [43,44].…”

Section: Investigated Desalination Scenariosmentioning

confidence: 99%

Partial Desalination of Saline Groundwater: Comparison of Nanofiltration, Reverse Osmosis and Membrane Capacitive Deionisation

2021

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Saline groundwater (SGW) is an alternative water resource. However, the concentration of sodium, chloride, sulphate, and nitrate in SGW usually exceeds the recommended guideline values for drinking water and irrigation. In this study, the partial desalination performance of three different concentrated SGWs were examined by pressure-driven membrane desalination technologies: nanofiltration (NF), brackish water reverse osmosis (BWRO), and seawater reverse osmosis (SWRO); in addition to one electrochemical-driven desalination technology: membrane capacitive deionisation (MCDI). The desalination performance was evaluated using the specific energy consumption (SEC) and water recovery, determined by experiments and simulations. The experimental results of this study show that the SEC for the desalination of SGW with a total dissolved solid (TDS) concentration of 1 g/L by MCDI and NF is similar and ranges between 0.2–0.4 kWh/m3 achieving a water recovery value of 35–70%. The lowest SECs for the desalination of SGW with a TDS concentration ≥2 g/L were determined by the use of BWRO and SWRO with 0.4–2.9 kWh/m3 for a water recovery of 40–66%. Even though the MCDI technique cannot compete with pressure-driven membrane desalination technologies at higher raw water salinities, this technology shows a high selectivity for nitrate and a high potential for flexible desalination applications.

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“…Methods for exploiting fresh groundwater underlain by saltwater include the application of horizontal wells, skimming wells, and surface drains, which are simple and effective engineering measures to limit the upconing of saltwater (Custodio, 1987;Post et al, 2018). Other engineering strategies for maximizing the extraction of freshwater in coastal settings include the use of recharge wells or infiltration ponds to create hydraulic barriers (Dror et al, 2004;Lu et al, 2017;Mahesha, 1996bMahesha, , 1996cMasciopinto, 2013), the extraction of saltwater to reduce the saltwater volume and impose negative hydraulic barriers (Ebeling et al, 2019;Mahesha, 1996a), the injection of compressed air to reduce hydraulic conductivity (Dror et al, 2004;Sun & Semprich, 2013), and the construction of subsurface physical barriers (Abdoulhalik et al, 2017;Li et al, 2018;Pool & Carrera, 2010).…”

Section: Introductionmentioning

confidence: 99%

Preventing Seawater Intrusion and Enhancing Safe Extraction Using Finite‐Length, Impermeable Subsurface Barriers: 3D Analysis

Kong

et al. 2020

Water Resources Research

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Subsurface physical barriers have been recognized as effective in mitigating seawater intrusion in coastal aquifers, although mainly 2D (cross-sectional) barrier effects have been considered. In this study, impermeable barriers with finite shore-parallel lengths are investigated through 3D numerical simulation, thereby extending previous analyses. Two scenarios are considered: (a) barrier-only and (b) barrier-well systems; and three available barrier types are analyzed and compared: (1) subsurface dam, (2) cutoff wall, and (3) fully penetrating barrier. Barrier location, length, and height are investigated, and barrier effectiveness is evaluated from seawater volumes, seawater wedge toe positions, and maximum safe pumping rates. In the barrier-only system, a better performance in preventing seawater intrusion was achieved by cutoff walls rather than subsurface dams. Finite-length subsurface dams may slightly enhance seawater extent along parts of the coastline that are beyond the dam's length. Cutoff walls performed best when located at relatively small distances from the coast in the barrier-only system, whereas with a well at 450 m from the shoreline, the subsurface dam located at a critical distance from the sea (i.e., 300 m in the current study) performed optimally (from the tested cases) and was superior to cutoff walls in terms of the maximum safe pumping rate. A fully penetrating barrier outperformed cutoff walls and subsurface dams, as expected. Our investigation indicates that subsurface barrier design should consider the effect of the shore-parallel length, because barrier benefits may otherwise be significantly overestimated.

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Potential of mixed hydraulic barriers to remediate seawater intrusion

Cited by 48 publications

References 33 publications

Groundwater quality

Groundwater quality

Partial Desalination of Saline Groundwater: Comparison of Nanofiltration, Reverse Osmosis and Membrane Capacitive Deionisation

Preventing Seawater Intrusion and Enhancing Safe Extraction Using Finite‐Length, Impermeable Subsurface Barriers: 3D Analysis

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