Multi-objective Optimization of Different Management Scenarios to Control Seawater Intrusion in Coastal Aquifers

Javadi, Akbar A.; Hussain, Mohammed S.; Sherif, Mohsen; Farmani, Raziyeh

doi:10.1007/s11269-015-0914-1

Cited by 65 publications

(25 citation statements)

References 29 publications

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“…Three variants of this problem were used in Post et al [17] to interpret the groundwater ages in coastal aquifers. Javadi et al [18] developed a multi-objective optimization algorithm and applied it to the HP in order to assess different management methods for controlling SWI. Hardyanto and Merkel [19], Herckenrath et al [20], Rajabi and Ataie-Ashtiani [21], Rajabi et al [22,23], Burrows and Doherty [24] and Riva et al [25] investigated the HP and conducted uncertainty analyses to evaluate the effect of incomplete knowledge of the aquifer parameters on the predictions of SWI models.…”

Section: Introductionmentioning

confidence: 99%

A Generalized Semi-Analytical Solution for the Dispersive Henry Problem: Effect of Stratification and Anisotropy on Seawater Intrusion

Fahs

Koohbor

Belfort

et al. 2018

Water

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The Henry problem (HP) continues to play a useful role in theoretical and practical studies related to seawater intrusion (SWI) into coastal aquifers. The popularity of this problem is attributed to its simplicity and precision to the existence of semi-analytical (SA) solutions. The first SA solution has been developed for a high uniform diffusion coefficient. Several further studies have contributed more realistic solutions with lower diffusion coefficients or velocity-dependent dispersion. All the existing SA solutions are limited to homogenous and isotropic domains. This work attempts to improve the realism of the SA solution of the dispersive HP by extending it to heterogeneous and anisotropic coastal aquifers. The solution is obtained using the Fourier series method. A special hydraulic conductivity-depth model describing stratified heterogeneity is used for mathematical convenience. An efficient technique is developed to solve the flow and transport equations in the spectral space. With this technique, we show that the HP can be solved in the spectral space with the salt concentration as primary unknown. Several examples are generated, and the SA solutions are compared against an in-house finite element code. The results provide high-quality data assessed by quantitative indicators that can be effectively used for code verification in realistic configurations of heterogeneity and anisotropy. The SA solution is used to explain contradictory results stated in the previous works about the effect of anisotropy on the saltwater wedge. It is also used to investigate the combined influence of stratification and anisotropy on relevant metrics characterizing SWI. At a constant gravity number, anisotropy leads to landward migration of the saltwater wedge, more intense saltwater flux, a wider mixing zone and shallower groundwater discharge zone to the sea. The influence of stratified heterogeneity is more pronounced in highly anisotropic aquifers. The stratification rate and anisotropy have complementary effects on all SWI metrics, except for the depth of the discharge zone.

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Section: Introductionmentioning

confidence: 99%

A Generalized Semi-Analytical Solution for the Dispersive Henry Problem: Effect of Stratification and Anisotropy on Seawater Intrusion

Fahs

Koohbor

Belfort

et al. 2018

Water

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“…Replenishment of already deteriorated water is expensive and sometimes ineffective, and prevention is hampered by the need to provide enough substitutes of chemically suitable water. Therefore, this issue has attracted much attention over the last decades, and several countermeasures have been proposed: (1) reducing pumping (Sherif et al 2012), (2) changing extraction arrays (Cai et al 2015), (3) enhanced natural and/or artificial recharge (Sophiya and Syed 2013), (4) direct reuse of treated wastewater or via artificial recharge (Ouelhazi et al 2014), (5) water transfer from other regions, (6) building subsurface physical barriers (Sugio et al 1987), (7) installing hydraulic barriers with/without injection wells (Hendizadeh et al 2016) which are sometimes supported by desalination plants (Payal 2014;Javadi et al 2015), (8) integrated fresh-keeper (IFK) wells (Grakist et al 2002;Kooiman et al 2004;Stuyfzand and Raat 2010;Zuurbier et al 2016), or (9) stand-alone BWRO or seawater reverse osmosis (SWRO) plants; the former with better feedwater quality has several advantages over SWRO leading to lower operational costs and less environmental problems (Stein et al 2016). Nevertheless, most of these actions are hampered by specific limitations reducing their wide applicability.…”

Section: Introductionmentioning

confidence: 99%

Mitigation of saltwater intrusion by ‘integrated fresh-keeper’ wells combined with high recovery reverse osmosis

Khadra

Stuyfzand

Khadra

2017

Science of The Total Environment

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Most countermeasures to mitigate saltwater intrusion in coastal, karstic or fractured aquifers are hindered by anisotropy, high transmissivities and complex dynamics. A coupled strategy is introduced here as a localized remedy to protect shallow freshwater reserves while utilizing the deeper intercepted brackish water. It is a double sourcing application where fresh-keeper wells are installed at the bottom of a deepened borehole of selected salinized wells, and then supported by high recovery RO desalination. The RO design has <1kWh/m energy consumption, and up to 96% recovery in addition to low scaling propensity without use of any anti-scalant. A feasibility study is presented as an example for a salinizing, brackish well (TDS ~1600mg/L) in the Damour coastal aquifer in Lebanon. The concept is expected to produce ca. 1000m/d of freshwater from this well by pumping 250m/d of fresh groundwater from the top well screen and 800m/d of brackish groundwater (to be later desalinized) from the fresh-keeper well screen below. Cost analysis shows that the capital cost could be returned back in 1 to 4years depending on the choice of produced water (bottled or tap) and available market. As an alternative, water from the RO plant could be blended with lower quality water, for instance untreated brackish groundwater (if unpolluted), to supply 3 more volumes for domestic use. The usage of brackish groundwater from integrated fresh-keeper wells thus serves 3 purposes: production of high quality drinking water, financial gain and mitigation of water stress by overpumping.

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“…Some of the possible options to control seawater intrusion (SWI) and move towards sustainable management of coastal aquifers include the use of different arrangements of physical and hydraulic barriers (e.g. Javadi et al, 2015;Kallioras et al, 2013;Pool and Carrera, 2010;Sherif and Hamza, 2001;Todd, 1974;van Dam, 1999). With higher practical functionality and efficiency, the control of SWI using hydraulic barriers has gained more popularity than the design of physical barriers as engineering interventions (Oude Essink, 2001;Pool and Carrera, 2010;Werner et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…The most efficient form of mixed barrier is the simultaneous use of recharge and abstraction barriers (Abd-Elhamid and Javadi, 2011;Hussain et al, 2015a). Continuous abstraction of brackish water near the coast, desalination of the abstracted brackish water for public use and simultaneous recharge of the aquifer using treated wastewater or other sources of good quality surface water (through surface infiltration basins or injection wells) have been introduced by Hussain et al (2015a) and Javadi et al (2015) for cost-effective control of SWI in coastal aquifers. This paper presents the application of aquifer storage and recovery (ASR), as a mixed-barrier technique, to control SWI.…”

Section: Introductionmentioning

confidence: 99%

Control of saltwater intrusion by aquifer storage and recovery

Hussain¹,

Sherif²,

Naseri-Karim-Vand³

2016

Proceedings of the Institution of Civil Engineers - Engineering

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This paper presents the results obtained from the application of aquifer storage and recovery (ASR) technique to control seawater intrusion (SWI) in coastal aquifers. The study is based on the numerical modelling experiments performed using the SUTRA (Saturated-Unsaturated TRAnsport) finite-element code on the Wadi Ham aquifer in the UAE. A three-dimensional numerical model of this aquifer is developed and calibrated based on the available hydrogeological data in real scale. A significant amount of SWI has been calculated for the year 2015 due to the high rates of pumping from the available local well fields. To study the future responses of the aquifer to different control actions, the transient responses of SWI are simulated over a 10-year planning horizon. The proposed management measure (ASR) is implemented in repeated cycles of artificial recharge, storage and recovery using an additional set of wells defined in the model. The results show that ASR is a reliable method in controlling SWI in coastal aquifer systems besides its conventional role in subsurface water banking.

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Multi-objective Optimization of Different Management Scenarios to Control Seawater Intrusion in Coastal Aquifers

Abstract: 9Seawater intrusion (SWI) is a widespread environmental problem, particularly in arid and 10 semi-arid coastal areas. Therefore, appropriate management strategies should be implemented

Cited by 65 publications

References 29 publications

A Generalized Semi-Analytical Solution for the Dispersive Henry Problem: Effect of Stratification and Anisotropy on Seawater Intrusion

A Generalized Semi-Analytical Solution for the Dispersive Henry Problem: Effect of Stratification and Anisotropy on Seawater Intrusion

Mitigation of saltwater intrusion by ‘integrated fresh-keeper’ wells combined with high recovery reverse osmosis

Control of saltwater intrusion by aquifer storage and recovery

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