Experimental and numerical investigation of saltwater intrusion dynamics on sloping sandy beach under static seaside boundary condition

Dalai, Chitaranjan; Munusamy, Selva Balaji; Dhar, Anirban

doi:10.1016/j.flowmeasinst.2020.101794

Cited by 8 publications

(2 citation statements)

References 54 publications

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“…Regarding layered coastal aquifers in particular, the impact of stratified heterogeneity has been studied in correlation with a series of different phenomena. Liu et al (2014) and Guo et al (2019) studied SWI in tidally affected stratified aquifers, similarly Dalai et al (2020) quantified the impact of shore slope, while Vithanage et al (2012) investigated aquifer salinization due to a tsunami‐like event. Similarly, Mehdizadeh et al (2014), studied saltwater ‐ freshwater interface on confined aquifers with impermeable strata, Abdoulhalik and Ahmed (2017a, 2017b) evaluated the suitability of various coastal protection techniques in layered hydrological systems, while Abdoulhalik et al (2020), investigated the impact of freshwater abstraction in heterogeneous coastal aquifers.…”

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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“…It was established that structured variations of hydraulic conductivity led to a stepped saltwater-freshwater interface, with the size of the various heterogeneous structures identified as the defining factor. A similar sloping sandy beach profile was recently utilised by Dalai et al [32] to study SWI in stratified coastal aquifers. Abdoulhalik et al [33] quantified the impact of aquifer stratification on the pumping-induced saltwater up-coining mechanism, while Etsias et al [22] conducted the first laboratory study of SWI in fractured coastal aquifers, demonstrating the impact that the presence of extremely permeable structures, such as fractures, have on saltwater dynamics.…”

Section: Introductionmentioning

confidence: 99%

Seawater Intrusion in Extremely Heterogeneous Laboratory-Scale Aquifer: Steady-State Results

Ahmed

Robinson

Hamill

et al. 2022

Water

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This work used experimental and numerical methods to investigate seawater intrusion (SWI) in a complex heterogeneous laboratory-scale aquifer. We started the analysis with a homogeneous isotropic aquifer as a reference case, then moved to heterogeneous layered aquifers. The study also investigated block-wise synthetic aquifers with different configurations. The seawater wedge toe length generally decreased under heterogeneous conditions, while the freshwater–saltwater dispersion/mixing zone generally increased when compared to the homogenous case. The saltwater–freshwater interface shows a distinct gradient change across boundaries at differing hydraulic conductivities. This was attributed to streamline refraction, which caused a reduction to the angle of intrusion when transitioning from high to low permeability zones and vice versa. The refraction also affected the mixing zone, where additional spreading was also observed when transitioning from high to low permeability zones and vice versa. When low permeability zones predominated the shoreline at the saline water boundary, this produced a shorter saline wedge in the horizontal direction, but it was more expanded vertically. This study provides insight into the general processes of SWI in heterogeneous aquifers and could be used as a basis for defining conceptual models of real-world systems. It highlights the capabilities of the image analysis to capture small perturbations.

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Impact of beach face slope variation on saltwater intrusion dynamics in unconfined aquifer under tidal boundary condition

Dalai

Dhar

2023

Flow Measurement and Instrumentation

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Experimental and numerical investigation of saltwater intrusion dynamics on sloping sandy beach under static seaside boundary condition

Cited by 8 publications

References 54 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

Seawater Intrusion in Extremely Heterogeneous Laboratory-Scale Aquifer: Steady-State Results

Impact of beach face slope variation on saltwater intrusion dynamics in unconfined aquifer under tidal boundary condition

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