Numerical modeling of three-dimensional contaminant migration from dissolution of multicomponent NAPL pools in saturated porous media

Lee, K. Y.; Chrysikopoulos, Constantinos V.

doi:10.1007/bf00768737

Cited by 41 publications

(20 citation statements)

References 16 publications

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“…In the subsurface, a DNAPL migrates towards the bottom of the aquifer until it reaches a low-permeability layer such as bedrock where a DNAPL pool may form and eventually dissolve into the groundwater (Chrysikopoulos 1995a;Khachikian and Harmon 2000). Numerous experimental and theoretical investigations focusing on DNAPL pool dissolution in homogeneous aquifers are presented in the literature (Anderson and others 1992;Johnson and Pankow 1992;Chrysikopoulos and others 1994;Lee and Chrysikopoulos 1995;Holman and Javendel 1996;Mason and Kueper 1996;Chrysikopoulos and Lee 1998;Seagren and others 1999;Leij and van Genchten 2000;Sciortino and others 2000;Tatalovich and others 2000;and Chrysikopoulos and others 2002, to mention a few). However, aquifer properties that may affect groundwater flow and transport are known to be highly spatially variable (Chrysikopoulos 1995b).…”

Section: Introductionmentioning

confidence: 97%

Nonaqueous liquid pool dissolution in three-dimensional heterogeneous subsurface formations

2003

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A three-dimensional numerical flow and contaminant transport model is developed to investigate the effect of variable hydraulic conductivity on average mass transfer coefficients associated with the dissolution of dense nonaqueous phase liquid (DNAPL) pools in heterogeneous, water-saturated subsurface formations. Randomly generated, threedimensional hydraulic conductivity fields are used to represent a heterogeneous confined aquifer. Model simulations indicate that the average mass transfer coefficient is inversely proportional to the variance of the log-transformed hydraulic conductivity. A power law correlation relating the Sherwood number to the variance of the log-transformed hydraulic conductivity and appropriate Peclet numbers is developed. A reasonable fit between predicted and numerically determined mass transfer coefficients is observed.

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Section: Introductionmentioning

confidence: 97%

Nonaqueous liquid pool dissolution in three-dimensional heterogeneous subsurface formations

2003

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“…DNAPL pools are often formed atop low permeability layers and in aquifers with even subtle heterogeneity (Khachikian and Harmon, 2000). The majority of existing literature on contaminant transport resulting from DNAPL pool dissolution is associated with homogeneous aquifers (Johnson and Pankow, 1992;Whelan et al, 1994;Chrysikopoulos, 1995a;Lee and Chrysikopoulos, 1995;Mason and Kueper, 1996;Kim and Chrysikopoulos, 1999;and Tatalovich et al, 2000, to mention a few). The incorporation of the spatial variability of soil and hydraulic properties in the study of¯uid¯ow and solute transport can be achieved only by means of stochastic models (Christakos, 1992).…”

Section: Introductionmentioning

confidence: 99%

Dissolution of nonaqueous phase liquid pools in anisotropic aquifers

Vogler¹,

Chrysikopoulos²

2001

Stochastic Environmental Research and Risk Assessment

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A two-dimensional numerical transport model is developed to determine the effect of aquifer anisotropy and heterogeneity on mass transfer from a dense nonaqueous phase liquid (DNAPL) pool. The appropriate steady state groundwater¯ow equation is solved implicitly whereas the equation describing the transport of a sorbing contaminant in a con®ned aquifer is solved by the alternating direction implicit method. Statistical anisotropy in the aquifer is introduced by two-dimensional, random log-normal hydraulic conductivity ®eld realizations with different directional correlation lengths. Model simulations indicate that DNAPL pool dissolution is enhanced by increasing the mean logtransformed hydraulic conductivity, groundwater¯ow velocity, and/or anisotropy ratio. The variance of the log-transformed hydraulic conductivity distribution is shown to be inversely proportional to the average mass transfer coef®cient.

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“…For a multicomponent NAPL mixture, the maximum aqueous-phase concentration at the NAPL/water interface is the equilibrium aqueous-phase concentration and is defined as (Broholm and Feenstra 1995;Lee and Chrysikopoulos 1995) …”

Section: Model Developmentmentioning

confidence: 99%

“…The dissolution behavior of a multicomponent NAPL mixture is considerably different than single-component NAPL dissolution. However, the majority of studies in the literature focus on single-component NAPL dissolution, and only a handful of studies focus on multicomponent NAPL dissolution (e.g., Pearce and others 1994;Lee and Chrysikopoulos 1995;Mukherji and others 1997;Chrysikopoulos and Lee 1998;Lee and Chrysikopoulos 1998). In this research, a semi-analytical model for three-dimensional contaminant transport resulting from the dissolution of a multicomponent, rectangular prism-shaped NAPL source in homogeneous, saturated porous media is presented.…”

Section: Introductionmentioning

confidence: 98%

“…Because NAPLs have low aqueous solubility, a small quantity of NAPL may contaminate the groundwater for decades. Moreover, aquifers are often polluted with NAPL mixtures which consist of more than one chemical compound (Lee and Chrysikopoulos 1995). The dissolution behavior of a multicomponent NAPL mixture is considerably different than single-component NAPL dissolution.…”

Section: Introductionmentioning

confidence: 99%

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Transport of dissolved contaminants originating from a rectangular prism-shaped, multicomponent nonaqueous-phase liquid source in saturated porous media

Lee

2002

Environmental Geology

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In this study, a three-dimensional semianalytical model for simulating the transport of contaminants originating from a dissolving, rectangular prism-shaped, multicomponent nonaqueousphase liquid (NAPL) source in homogeneous, saturated porous media is presented. The NAPL dissolution process for each component is envisioned to occur in a series of consecutive short intervals (pulses). The equilibrium aqueous concentration and the source dimensions are assumed to remain constant for the duration of each pulse. Individual component aqueous phase concentrations resulting from each dissolution interval are determined by an existing, single-component analytical solution. A synthetic NAPL mixture consisting of tetrachloroethylene and trichloroethylene was used for model simulation. Results show that for a dissolving multicomponent NAPL mixture, downstream aqueous-phase concentrations may not always reflect source characteristics. The model is useful for an understanding of field data in homogeneous subsurface formations and for interpretation of bench-scale laboratory experiments.

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Numerical modeling of three-dimensional contaminant migration from dissolution of multicomponent NAPL pools in saturated porous media

Cited by 41 publications

References 16 publications

Nonaqueous liquid pool dissolution in three-dimensional heterogeneous subsurface formations

Nonaqueous liquid pool dissolution in three-dimensional heterogeneous subsurface formations

Dissolution of nonaqueous phase liquid pools in anisotropic aquifers

Transport of dissolved contaminants originating from a rectangular prism-shaped, multicomponent nonaqueous-phase liquid source in saturated porous media

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