Analysing the Combined Effect of Barrier Wall and Freshwater Injection Countermeasures on Controlling Saltwater Intrusion in Unconfined Coastal Aquifer Systems

Armanuos, Asaad M.; Ibrahim, Mona G.; Mahmod, Wael Elham; Takemura, Jiro; Yoshimura, Chihiro

doi:10.1007/s11269-019-2184-9

Cited by 46 publications

(28 citation statements)

References 12 publications

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“…Sandbox laboratory setups have been extensively utilized to study the fundamental mechanisms of saltwater intrusion in coastal aquifers (Abdoulhalik et al, 2017; Armanuos et al, 2019; Goswami & Clement, 2007; Konz et al, 2008; Kuan et al, 2012; Liu et al, 2017; Robinson et al, 2016; Stoeckl & Houben, 2012; Takahashi et al, 2018; Zhang et al, 2002). The majority of laboratory studies have recreated SWI in homogeneous synthetic aquifers (Abdelgawad et al, 2018; Abdoulhalik & Ahmed, 2018a, 2018b; Q. Chang et al, 2019; Guo et al, 2019; Kuan et al, 2019; Lee et al, 2019; Levanon et al, 2019; Memari et al, 2020; Na et al, 2019; Noorabadi et al, 2017; Shen et al, 2020; Stoeckl et al, 2019; Yu et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

The impact of aquifer stratification on saltwater intrusion characteristics. Comprehensive laboratory and numerical study

Etsias

Hamill

Águila

et al. 2021

Hydrological Processes

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Laboratory experiments and numerical simulations were utilized in this study to assess the impact of aquifer stratification on saltwater intrusion. Three homogeneous and six layered aquifers were investigated. Image processing algorithms facilitated the precise calculation of saltwater wedge toe length, width of the mixing zone, and angle of intrusion. It was concluded that the length of intrusion in stratified aquifers is predominantly a function of permeability contrast, total aquifer transmissivity and the number of heterogeneous layers, being positively correlated to all three. When a lower permeability layer overlays or underlays more permeable zones its mixing zone widens, while it becomes thinner for the higher permeability strata. The change in the width of the mixing zone (WMZ) is positively correlated to permeability contrast, while it applies to all strata irrespectively of their relative vertical position in the aquifer. Variations in the applied hydraulic head causes the transient widening of WMZ.These peak WMZ values are larger during saltwater retreat and are negatively correlated to the layer's permeability and distance from the aquifer's bottom. Moreover, steeper angles of intrusion are observed in cases where low permeability layers overlay more permeable strata, and milder ones in the inverse aquifer setups. The presence of a low permeability upper layer results in the confinement of the saltwater wedge in the lower part of the stratified aquifer. This occurs until a critical hydraulic head difference is applied to the system. This hydraulic gradient value was found to be a function of layer width and permeability contrast alike.

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Section: Introductionmentioning

confidence: 99%

The impact of aquifer stratification on saltwater intrusion characteristics. Comprehensive laboratory and numerical study

Etsias

Hamill

Águila

et al. 2021

Hydrological Processes

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“…The SEAWAT code has been extensively implemented for the simulation of SWI (e.g., [11,14,16,33,35]). The finite difference SEAWAT code was used by Guo and Langevin (2002) to simulate the impact of using a recharge well to prevent and control the SWI in sloping unconfined coastal aquifers [36].…”

Section: Methodsmentioning

confidence: 99%

“…Different strategies were suggested by [6][7][8] to control or prevent SWI in the coastal aquifers. These approaches may be summarized into: (1) minimization of abstraction from groundwater [9,10], (2) artificial recharge wells and artificial recharge through spreading basins [11], (3) regional injecting of freshwater in the coastal zone to maintain the volume of freshwater storage [12][13][14], (4) saltwater abstraction along the coastal zone [15], (5) artificial barriers construction [16][17][18], (6) optimum abstraction [19][20][21][22], (7) combination techniques [14,23,24], and (8) land reclamation. The following define different techniques to mitigate and prevent SWI in the coastal aquifers.…”

Section: Introductionmentioning

confidence: 99%

“…The results of the simulation confirmed that using freshwater injecting wells or an underground flow barrier would both introduce an effective approach to control and prevent SWI in the Damsarkho aquifer. Armanuos et al (2019) investigated the effectiveness of two combination techniques to control and retreat the saltwater intrusion through experimental and numerical study [14]. A sandbox model was implemented to study the effect of freshwater injection through a well after embedment of a barrier wall, in addition to the embedment of the barrier wall after injection of freshwater through a well, as well as two-combination methods.…”

Section: Introductionmentioning

confidence: 99%

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Assessing the Effectiveness of Using Recharge Wells for Controlling the Saltwater Intrusion in Unconfined Coastal Aquifers with Sloping Beds: Numerical Study

Armanuos

Al‐Ansari

Yaseen‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬

2020

Sustainability

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Groundwater systems are considered major freshwater sources for many coastal aquifers worldwide. Seawater intrusion (SWI) inland into freshwater coastal aquifers is a common environmental problem that causes deterioration of the groundwater quality. This research investigates the effectiveness of using an injection through a well to mitigate the SWI in sloping beds of unconfined coastal aquifers. The interface was simulated using SEAWAT code. The repulsion ratios due to the length of the SWI wedge (RL) and the area of the saltwater wedge (RA) were computed. A sensitivity analysis was conducted to recognize the change in the confining layer bed slope (horizontal, positive, and negative) and hydraulic parameters of the value of the SWI repulsion ratio. Injection at the toe itself achieved higher repulsion ratios. RL and RA declined if the injection point was located remotely and higher than the toe of the seawater wedge. Installation at the toe achieved a higher RL in positive sloping followed by horizontal and negative slopes. Moreover, the highest value of RA could be reached by injecting at the toe itself with a horizontal bed aquifer, followed by negative and positive slopes. The recharge well is confirmed as one of the most effective applications for the mitigation of SWI in sloping bed aquifers. The Akrotiri case study shows that the proposed recharging water method has a significant impact on controlling SWI and declines in both SWI wedge length and area.

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“…Several laboratory studies used the sandbox device to validate and verify their numerical models (Armanyous et al., 2016; Basha et al., 2009), to estimate pollutant transport parameters for a tropical sand (Ojuri & Ola, 2010), to study the flow net, to estimate values of uplift pressure underneath a hydraulic structure, and to determine the best inclination angle of the cutoff (45°) in order to reduce both the uplift pressure and the quantity of seepage (Alghazali & Alnealy, 2015). A combination of flow barrier and freshwater injection in unconfined coastal aquifer systems, when simulated using the sandbox, proved valid to force the saltwater to retreat with a greater repulsion ratio than either of them separately (Armanuos, Ibrahim, Mahmood, Takakura, & Yoshimura, 2019).…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental analyses of the use of double vertical barrier walls for groundwater protection

Mostafa

Gado

Masoud

et al. 2020

Water Environment Research

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The groundwater contamination and its impacts on the hydrologic systems and society are critical environmental concerns in the world. This research presents insights from the numerical (SEEP/W and CTRAN/W) and the experimental (sandbox model) analyses of the use of double vertical barrier walls for groundwater protection. The main objective was to evaluate contaminant transport under the effect of several variables. The arrival time increases with increasing the distance between the pollutant source and the first wall, first wall depth of penetration, the distance between the two walls and also increases at smaller hydraulic head differences, and lower conductivities. Furthermore, using double barrier walls would significantly reduce contaminant concentration at the downstream area. This control is most significant when the depth of first wall penetration is larger than that of the second wall. Results proved consistent with several similar studies and advantageous over many of them by the integrated use of both techniques with more variable parameters evaluated. © 2020 Water Environment Federation • Practitioner points • The research will introduce insights from the effect of using double barrier walls on the hydraulic control of contaminant transport. • The effect of several variables on the contaminant arrival time and concentration is investigated. • Using double barrier walls has a significant impact on contamination transport through the soil. • This control is most significant when the penetration depth of the first wall is larger than that of the second.

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Analysing the Combined Effect of Barrier Wall and Freshwater Injection Countermeasures on Controlling Saltwater Intrusion in Unconfined Coastal Aquifer Systems

Cited by 46 publications

References 12 publications

The impact of aquifer stratification on saltwater intrusion characteristics. Comprehensive laboratory and numerical study

The impact of aquifer stratification on saltwater intrusion characteristics. Comprehensive laboratory and numerical study

Assessing the Effectiveness of Using Recharge Wells for Controlling the Saltwater Intrusion in Unconfined Coastal Aquifers with Sloping Beds: Numerical Study

Numerical and experimental analyses of the use of double vertical barrier walls for groundwater protection

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