Predicting Vertical <scp>LNAPL</scp> Distribution in the Subsurface under the Fluctuating Water Table Effect

Boumaiza, Lamine; Chesnaux, Romain; Walter, Julien; Lenhard, R. J.; Hassanizadeh, S. M.; Dokou, Zoi; Alazaiza, Motasem Y. D.

doi:10.1111/gwmr.12497

Cited by 11 publications

(3 citation statements)

References 40 publications

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“…The impact of fluctuations in the water table on solute transport has been investigated by researchers. As mentioned above, Attie et al [13] and Boumaiza et al [14] used modeling to analyze instantaneous changes in the NAPL thickness in water wells caused by water table fluctuations. Guo et al [9] found that water table fluctuations shortened or elongated the transport route of the dissolved phase in the NAPL.…”

Section: Discussionmentioning

confidence: 99%

“…With the exception of the convection-diffusion mechanism, it has been found that fluctuations in the water table also have an impact on the solute transport process. For example, Attie et al [13] and Boumaiza et al [14] used modeling to analyze instantaneous changes in the non-aqueous phase liquid (NAPL) thickness in water wells caused by water table fluctuations. Guo et al [9] found that water table fluctuations shortened or elongated the transport route of the dissolved phase in the NAPL.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of Solute Transport under Changing Gradient of Water Table

Dou,

Gao,

Zhao

et al. 2023

Water

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Solute transport in aquifers is usually controlled by dynamic changes in groundwater tables. The influence mechanism of surface hydrological processes, especially precipitation, on solute transport under different water table conditions has not been studied much. Prior to the direct application of the existing solute transport mechanisms and models to the solute transport process, the following questions need to be addressed: (1) Do surface hydrological conditions (e.g., precipitation) cause changes in the gradient of the water table within a specific region? (2) If the gradient of the water table does change, how does the change influence solute transport and distribution in the aquifer? The objective of this study is to investigate how precipitation impacts the gradient of water table and to analyze how the solute transport is influenced by the change in the gradient of water table. To achieve this, we employed an analytical solute transport model for the time-varying gradient of a water table through continuous multipoint monitoring of the groundwater table data. Further, the model was applied to indoor experiments to simulate solute transport with and without precipitation. Finally, the mechanism of solute transport in the aquifer under the changing gradient of the water table was analyzed using mathematical and physical models, and the modeling results were compared with those from a numerical model to analyze the modeling reliability. The results showed that precipitation changed the previously stable gradient of the water table, which further altered the gradient of the water table and the transport path of the tracer. The tracer transport direction was primarily controlled by the flow direction in the sandy aquifer trough without precipitation. However, the route of the tracer transport was consistent with the direction of the change in the water table gradient due to precipitation. The small discrepancy between the results from the analytical and numerical models indicates that the model employed in this study is reliable.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simulation of Solute Transport under Changing Gradient of Water Table

Dou,

Gao,

Zhao

et al. 2023

Water

View full text Add to dashboard Cite

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“…Investigation, management and remediation of LNAPL-affected sites are challenging due to their complexity (USEPA, 1993;Charbeneau et al, 1995;USEPA, 1996;Tomlinson et al, 2017;Ebrahimi et al, 2019;Boumaiza et al, 2022). Despite these challenges, there are many reports of successes in subsurface LNAPL investigation and detection.…”

Section: Introductionmentioning

confidence: 99%

Time-Lapse Ground Penetrating Radar (GPR) Imaging of Used Engine Oil Contamination.

et al. 2023

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Time-Lapse Ground Penetrating Radar (GPR) was employed to study used engine oil (UEO) contamination of sandy environment in laboratory setting. GPR is a near-surface geophysical methods that uses electromagnetic fields to provide image of the dielectric properties of earth materials to detect structures and changes in materials properties within the subsurface. This research aimed to detect, monitor and map the migration of UEO contaminant in sand. The results of this study revealed that the migration of the UEO contamination with a homogeneously laid sand is non-uniform. UEO plumes were identified as high amplitude signals with enhanced reflectivity. There was a progressive decrease in GPR signal amplitudes (reflection reduction) within the contaminated area of the tank with time. This attenuation of GPR signal amplitudes was interpreted as caused by the evaporation of some portion of the UEO in the vadose zone as a result of temperature increase in time and due to the occurrence of UEO biodegradation. The time-lapse GPR proved to be an effective technique for detecting, monitoring, and mapping UEO migration within sand tank in laboratory setting.

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