Comparison of Solute Transport in Three Composite Liners

Foose, Gary J.; Benson, Craig H.; Edil, Tuncer B.

doi:10.1061/(asce)1090-0241(2002)128:5(391)

Cited by 103 publications

(69 citation statements)

References 25 publications

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“…Molecular diffusion takes place over the entire area of the geomembrane, hence the contribution of defects is considered negligible, as shown by Foose et al (2002). Katsumi et al (2001) proposed the following additional simplifications, which are supported by comparisons between analytical and numerical results obtained by Foose et al (1999): (1) due to the geomembrane's small thickness, diffusion through the geomembrane is ignored as insignificant, in comparison to diffusion through clay and (2) advection through the clay can also be ignored.…”

Section: Geomembrane With Defects: Transport Of Organic Contaminantsmentioning

confidence: 99%

“…20) makes an appreciable difference in the calculated mass, close to two orders of magnitude, for the GM-GCL liner, but not for the composite liner with the compacted clay. Foose et al (2002) first observed that when performance is evaluated in terms of contaminant mass (instead of contaminant concentration), the long-term protection offered by the GM-GCL liner is more comparable to the GM-CCL liner, due to the lower flow rate through the GM-GCL liner involved in the calculation of mass flux. Herein it is shown that this conclusion is only valid for the nonconservative boundary condition of c(x = ?, t C 0) = 0 corresponding to Eq.…”

Section: Transport Modellingmentioning

confidence: 99%

“…Numerical solutions have the advantages of offering various options for specifying boundary conditions at the liner faces and accounting explicitly for layers of varying properties. Foose et al (2002) used a numerical model to address equivalency issues by comparing GM-CCL and GM-GCL combinations. In addition, they studied the effect of boundary conditions assumed.…”

Section: Introductionmentioning

confidence: 99%

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Landfill Base Liners: Assessment of Material Equivalency and Impact to Groundwater

Kandris

Pantazidou

2011

Geotech Geol Eng

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This paper gathered available flow and transport solutions and used them for two composite liners, consisting of geomembrane (GM) overlying either a compacted clay liner (CCL) or a geosynthetic clay liner (GCL). Its aim is to provide a guiding framework for the possible choices of (a) approaches to bottom liner design, (b) respective analytical solutions to flow and transport equations, as well as (c) parameters required for each type of solution. On the basis of the obtained results, the following recommendations are made. When the goal of analysis is to determine material equivalency, leachate flow rate is an adequate key parameter for GM-CCL composite liners. For GM-GCL composite liners, it is necessary to compute contaminant concentration or mass flux, considering (a) transport through defects for inorganic contaminants and (b) diffusion and the contribution of any available attenuation layer for organic contaminants. When the goal of analysis is to assess impact to groundwater, it is advised to calculate both discharge rate and contaminant mass flux regardless of liner type. The critical parameter for the transport calculations is the retardation factor of the contaminant, for the case of CCLs, while the results for GCLs are much less sensitive to this parameter.

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Section: Geomembrane With Defects: Transport Of Organic Contaminantsmentioning

confidence: 99%

Section: Transport Modellingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Landfill Base Liners: Assessment of Material Equivalency and Impact to Groundwater

Kandris

Pantazidou

2011

Geotech Geol Eng

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“…The model parameters employed in the following analyses are based on a recent study of solute transport in composite liners by Foose et al [21]. However, since consolidation data for landfill Table I.…”

Section: Model Parametersmentioning

confidence: 99%

Theoretical investigation of the effects of consolidation on contaminant transport through clay barriers

Lewis

Pivonka

Smith

2008

Num Anal Meth Geomechanics

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SUMMARYConsolidation of clayey contaminant barriers such as landfill liners has been postulated as a cause of early breakthrough of contaminants. In this paper we theoretically investigate this proposition. For this purpose a sophisticated one-dimensional, large-deformation model of coupled mechanical consolidation and solute transport is employed. This new model is a generalization of existing coupled consolidation and solute transport models described in the literature. It takes into account both non-linearities in geometry as well as constitutive relations. The latter relate the compressibility, hydraulic conductivity and coefficient of effective diffusivity to the deformation of the soil. The model is applied to a case study of a clay liner and geomembrane system. Results obtained from numerical solution of the model equations are compared with those from various simplified models, including a 'diffusion only' (i.e. a rigid soil) model traditionally used in contaminant barrier design. For barriers incorporating low compressibility soils (as for many well compacted clays), there is little difference between contaminant transit (i.e. breakthrough) times predicted by the two models. However, for contaminant barriers incorporating more compressible soils, consolidation is shown to significantly accelerate transport. These results indicate the potential importance of accounting for the effects of soil consolidation and highlight the limitations of existing models when modelling solute transport through composite barriers utilizing soft soils. Based on these limited results, we suggest a possible way of taking into account soil consolidation using simplified models.

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“…Recent landfills contribute to pollution when leaks from the storage compartment occur. The regular defects are fracture system, jointing and inhomogeneity due to porosity as well as the permeability of the subsurface geology [4]. These subsurface fracture inhomogeneities favour input of leachate into the subsoil, weathered and fractured soil membranes, and unconfined aquifers after percolation.…”

Section: Introductionmentioning

confidence: 99%

Geo-electrical assessment of coefficient of permeability and porosity of leachate plume at Asin dumpsite, Iwaro-oka, southwestern Nigeria

Ikeoha

Oladunjoye

Ajayi

2016

Materials and Geoenvironment

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An integrated geophysical (involving two-dimensional [2D] electrical resistivity) and petrophysical study was conducted in the Precambrian Crystalline Basement area of Iwaro-oka Akoko, southwestern Nigeria. Five 2D resistivity profiles, both around the perimeters and inside the dump, were investigated with maximum lengths of 100 m. Results of the resistivity imaging delineated the leachate plumes as low-resistivity zones, with values ranging from 3 Ω m to 55 Ω m. The coefficient of permeability ranged from 4.33 × 10 -6 to 7. 82 × 10 -3 , and the average porosity ranged from 32 Ω m to 169 Ω m, thus indicating migration of leachate plume to the groundwater due to the high coefficient of permeability and the porosity.Key words: geophysical, geochemical, coefficient of permeability, porosity, leachate IzvlečekNa območju deponije odpadkov, ki leži na ozemlju predkambrijske kristalinične podlage pri kraju Iwaro--oka akoko v jugozahodni Nigeriji so izvedli povezano geofizikalno (z uporabo dvodimenzionalne električne upornosti) in petrofizikalno prospekcijo. Na odvalu in v njegovi bližnji okolici so izmerili pet 2D upornostnih profilov dolžine do 100 m. Na podlagi podatkov upornostnih meritev je bilo mogoče omejiti območja širje-nja lužine iz deponije kot cone nizke upornosti v razponu 3 Ω m to 55 Ω m. Količnik prepustnosti in povprečna poroznost se gibljeta prvi v mejah od 4.33 × 10 -6 do 7.82 × 10 -3 in druga od 32 Ω m to 169 Ω m. Visoke vrednosti količnika prepustnosti in poroznosti nakazujejo poti, po katerih odteka lužina v podtalnico.

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Comparison of Solute Transport in Three Composite Liners

Cited by 103 publications

References 25 publications

Landfill Base Liners: Assessment of Material Equivalency and Impact to Groundwater

Landfill Base Liners: Assessment of Material Equivalency and Impact to Groundwater

Theoretical investigation of the effects of consolidation on contaminant transport through clay barriers

Geo-electrical assessment of coefficient of permeability and porosity of leachate plume at Asin dumpsite, Iwaro-oka, southwestern Nigeria

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