On the influence of groundwater table fluctuations on oil thickness in a well related to an LNAPL contaminated aquifer

Atteia, Olivier; Palmier, C.; Schäfer, Gerhard

doi:10.1016/j.jconhyd.2019.03.008

Cited by 16 publications

(11 citation statements)

References 14 publications

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“…When the LNAPL contamination state of an area reaches relevant levels, it is common to find a thickness of free-phase supernatant product between groundwater and air. In this case, the physical behavior of the LNAPL layer is also controlled by groundwater table fluctuation over time, which affects the subsurface distribution of the different LNAPL phases (Gatsios et al 2018;Atteia et al 2019). This represents a key aspect to consider when dealing with a site-specific environmental characterization or remediation.…”

Section: Introductionmentioning

confidence: 99%

Evolution of LNAPL contamination plume in fractured aquifers

Mineo

Dell’Aera²,

Rizzotto³

2022

Bull Eng Geol Environ

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The LNAPL contamination affecting an industrial area of southeastern Sicily (Italy) is reported herein as a case study to analyze some peculiarities on its spatial evolution. The free-phase product of light hydrocarbons, leaked from a tank, deserved investigations due to its anomalous migration trend, which was not consistent with the static groundwater flow direction of the area. The collection of geological and hydrogeological data and their organization into a GIS database allowed reconstructing the evolutionary stage of the plume within the 2014–2020 time interval, providing some explanation to the scientific problem. The supernatant thickness was compared with the groundwater oscillation, leading to consideration on the aquifer typology. The causes of the peculiar migration trend were found in three main factors, among which the geological and geostructural ones gain a key relevance. Achieved results show that the rock mass fracturing and the presence of underground structures, probably of tectonic origin, are responsible in driving the contamination plume through a preferential path under the dynamic condition induced by anthropic activities. This supports the need of underground geological and geostructural knowledge when dealing with similar issues and when designing specific remediation measures; the case study presented herein demonstrates that the correct location of remedial measures is crucial for reclamation purposes. Furthermore, data were statistically analyzed looking for a relation between real and apparent supernatant thickness. Prediction equations, for a quick estimation of the contamination entity in such type of aquifers, are presented providing hints for future studies on other settings worldwide.

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Section: Introductionmentioning

confidence: 99%

Evolution of LNAPL contamination plume in fractured aquifers

Mineo

Dell’Aera²,

Rizzotto³

2022

Bull Eng Geol Environ

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“…This makes it possible to determine the influence of the water table fluctuations by monitoring the evolution of LNAPL thickness relative to the water table fluctuations. In relatively recent efforts, researchers have used linear and nonlinear optimization models coupled with numerical models to develop effective remediation strategies consistent with complex objective functions (Qin et al 2009; Dokou and Karatzas 2013; Matos de Souza et al 2016; Atteia et al 2019; Sookhak Lari et al 2019). For such numerical models, multiple variables including LNAPL and subsurface properties, as well as initial and boundary conditions, need to be known (e.g., the rate and volume of LNAPL released into the subsurface, the timing and magnitude of potential fluid saturation path changes from precipitation and water table fluctuations, etc.…”

Section: Introductionmentioning

confidence: 99%

“…In reality, however, the relationship between the apparent LNAPL thickness in the observation well and the actual LNAPL thickness in the soil is complex (Farr et al 1990;Lenhard and Parker 1990;Ballestero et al 1994;EPA 1996;Deska and Ociepa 2013;Gatsios et al 2018). Due to the potential delay between the LNAPL movement in the soil and that in the observation well, the thickness of the apparent LNAPL in the observation well can vary significantly-and may even disappear from the observation well during the entire period of elevated water table levels-underpinning a complex relationship between the actual LNAPL thickness in a soil and the apparent LNAPL thickness in an observation well (Steffy et al 1998;Aral and Liao 2002;Atteia et al 2019). Some methods have been proposed for evaluating the actual LNAPL thickness in soil based on the Bail-Down test, which consists of rapid removal of as much of the LNAPL in an observation well as is practical, followed by monitoring of the elevations of the LNAPL/air and LNAPL/water interfaces in the observation well (Yaniga and Demko 1983;Gruszcenski 1987;Hughes et al 1988;Wagner et al 1989).…”

Section: Introductionmentioning

confidence: 99%

Predicting Vertical LNAPL Distribution in the Subsurface under the Fluctuating Water Table Effect

Boumaiza

Chesnaux

Walter

et al. 2022

Groundwater Monitoring Rem

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This column reviews the general features of PHT3D Version 2, a reactive multicomponent transport model that couples the geochemical modeling software PHREEQC-2 (Parkhurst and Appelo 1999) with three-dimensional groundwater flow and transport simulators MODFLOW-2000 and MT3DMS (Zheng and Wang 1999). The original version of PHT3D was developed by Henning Prommer and Version 2 by Henning Prommer and Vincent Post (Prommer and Post 2010). More detailed information about PHT3D is available at the website http://www.pht3d.org.The review was conducted separately by two reviewers. This column is presented in two parts.

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“…Groundwater table fluctuations can change the subsurface distribution of the different LNAPL phases [7][8][9]. As the water table rises or falls, free LNAPL may become entrapped or entrapped LNAPL may become free LNAPL, respectfully [10].…”

Section: Introductionmentioning

confidence: 99%

“…To provide insights concerning subsurface LNAPL behavior and test predictive models, investigators conducted small-and intermediate-scale laboratory experiments and field investigations [7,8,10,[31][32][33][34][35][36][37][38][39][40]. The works involved entrapment of LNAPL, the effect of water table fluctuations, assessing LNAPL recoverability, transient effects, and other aspects.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of LNAPL Behavior in Water Table Inter-Fluctuate Zone under Groundwater Drawdown Condition

Azimi

Vaezihir

Lenhard

et al. 2020

Water

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We investigate the movement of LNAPL (light non-aqueous phase liquid) into and out of monitoring wells in an immediate-scale experimental cell. Aquifer material grain size and LNAPL viscosity are two factors that are varied in three experiments involving lowering and rising water levels. There are six monitoring wells at varying distances from a LNAPL injection point and a water pumping well. We established steady water flow through the aquifer materials prior to LNAPL injection. Water pumping lowered the water levels in the aquifer materials. Terminating water pumping raised the water levels in the aquifer materials. Our focus was to record the LNAPL thickness in the monitoring wells under transient conditions. Throughout the experiments, we measured the elevations of the air-LNAPL and LNAPL-water interfaces in the monitoring wells to obtain the LNAPL thicknesses in the wells. We analyze the results and give plausible explanations. The data presented can be employed to test multiphase flow numerical models.

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On the influence of groundwater table fluctuations on oil thickness in a well related to an LNAPL contaminated aquifer

Cited by 16 publications

References 14 publications

Evolution of LNAPL contamination plume in fractured aquifers

Evolution of LNAPL contamination plume in fractured aquifers

Predicting Vertical LNAPL Distribution in the Subsurface under the Fluctuating Water Table Effect

Evaluation of LNAPL Behavior in Water Table Inter-Fluctuate Zone under Groundwater Drawdown Condition

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