Effectiveness of equilibrium and physical non-equilibrium approaches for interpreting solute transport through undisturbed soil columns

Comegna, V.; Coppola, Antonio; Sommella, A.

doi:10.1016/s0169-7722(01)00100-0

Cited by 62 publications

(42 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Response surface analysis was used to analyze the problems in inverse parameter identification (Schwartz et al, 2000). Comegna et al (2001) conducted seventeen leaching experiments with three intact soil columns under both saturated and unsaturated conditions. A CDE, MIM, and CLT (convective lognormal transfer function) models all gave indistinguishable results when applied to fit the effluent BTCs, even those with an asymmetrical shape.…”

Section: Parameter Identifiability In Two-region Modelsmentioning

confidence: 99%

“…A CDE, MIM, and CLT (convective lognormal transfer function) models all gave indistinguishable results when applied to fit the effluent BTCs, even those with an asymmetrical shape. However, fitted values of the retardation factor R b 1 in the CDE might suggest the presence of PNE, in particular since the MIM could be used with R = 1 without decrease in goodness-of-fit (Comegna et al, 2001). …”

Section: Parameter Identifiability In Two-region Modelsmentioning

confidence: 99%

“…Different other approaches, such as temporal moments, DFM, CLT (see above, Comegna et al, 2001), and three-region approaches were compared with MIM to assess their individual weaknesses and strengths. Stagnitti et al (2000) found the statistical temporal moments method to be as suitable as MIM for describing tracer BTCs, while in another study, the moment method failed to capture preferential peak concentrations of BTCs (Kamra et al, 2001).…”

Section: Alternative Model Approachesmentioning

confidence: 99%

See 2 more Smart Citations

A review of model applications for structured soils: a) Water flow and tracer transport

Köhne

Šimůnek

2009

Journal of Contaminant Hydrology

291

224

View full text Add to dashboard Cite

Section: Parameter Identifiability In Two-region Modelsmentioning

confidence: 99%

Section: Parameter Identifiability In Two-region Modelsmentioning

confidence: 99%

Section: Alternative Model Approachesmentioning

confidence: 99%

See 1 more Smart Citation

A review of model applications for structured soils: a) Water flow and tracer transport

Köhne

Šimůnek

2009

Journal of Contaminant Hydrology

291

224

View full text Add to dashboard Cite

“…[45] The hydraulic properties of fractured soils may normally be estimated by measurements of the bulk soil properties, q b (h) and K b (h) from experiments carried out on large blocks of soils [Comegna et al, 2001;Greco, 2002;Castiglione et al, 2003;Coppola et al, 2004]. In aggregated soils with fractures, the q b (h) and K b (h) functions generally result in curve shapes with double/triple inflection points [Mohanty et al, 1997;Köhne et al, 2002;Coppola et al, 2009bCoppola et al, , 2009c, indicative of the multiple pore domains.…”

Section: Relating Aggregate Shrinkage To Hydraulic Properties Of Fracmentioning

confidence: 99%

Dual‐permeability model for flow in shrinking soil with dominant horizontal deformation

Coppola

Gerke

Comegna

et al. 2012

Water Resources Research

View full text Add to dashboard Cite

In this study, a dual‐permeability approach is discussed for modeling preferential flow in shrinking soils by accounting for shrinking effects on macropore and matrix domain hydraulic properties. Conceptually, the soil is treated as a dual‐permeability bulk porous medium consisting of two dynamic interacting pore domains: (1) the fracture (from shrinkage) pore domain and (2) the aggregate (interparticles plus structural) or matrix pore domain. The model assumes that the swell‐shrink dynamics is represented by the inversely proportional volume changes of the fracture and matrix domains, while the overall porosity of the total soil, and hence the layer thickness, remains constant. This assumption can be justified for soils with dominant horizontal soil deformation in the swelling‐shrinkage process (shrinkage geometry factor,rs> 3). The swell‐shrink dynamics was included in a one‐dimensional dual‐permeability model in which water flow in both domains was described with the Richards' equation. Swell‐shrink dynamics was incorporated in the model partly by changing the coupled domain‐specific hydraulic properties according to the shrinkage characteristics of the matrix and partly by allowing the fractional contribution of the two domains to change with the pressure head. As a first step, the hysteresis in the swell‐shrink dynamics was not included. We also assumed that the aggregate behavior and its hydraulic properties depend only on the average aggregate water content and not on its internal real distribution. The model proved, describing successfully effects of shrinkage on the spatial and temporal evolution of water contents measured in a silty loam soil in the field.

show abstract

“…The CDE can account for hydrodynamic dispersion, advection and retardation of the solutes. The widespread use of CDE models in interpreting chemical transport phenomena in natural porous media is well documented elsewhere [7].…”

Section: mentioning

confidence: 99%

Solute Transportin Sand Columns as Affected by Effluent Surface Tension

Erşahin¹

2015

JAST-A

View full text Add to dashboard Cite

Transport of nonreactive solutes in soils is principally controlled by soil properties, such as particle-size distribution and pore geometry. Surface tension of soil water yields capillary forces that bind the water in the soil pores. Changes in soil water surface tension by contaminants may affect flow of soil water due to decreased capillary forces, caused by lowered soil water surface tension. This study aimed at assessing solute transport in sand columns as affected by effluent surface tension. Miscible displacement (MD) tests were conducted on sand columns repacked with sands sieved from 2.0, 1.0, 0.5 and 0.25 mm screens. The MD tests were conducted with 0.05 M bromide solutions prepared using water with surface tension adjusted to 72.8, 64, 53.5 and 42 dyne/cm 2 .Obtained breakthrough curves were modeled with the convection-dispersion equation (CDE) model. Coefficient of hydrodynamic dispersion and pore-water velocity responded inconsistently across decreased particle-sizes and water surface tensions and this was attributed to non-uniform effect of lowered effluent surface tension on solute transport in different pore-size distribution.

show abstract

Effectiveness of equilibrium and physical non-equilibrium approaches for interpreting solute transport through undisturbed soil columns

Cited by 62 publications

References 29 publications

A review of model applications for structured soils: a) Water flow and tracer transport

A review of model applications for structured soils: a) Water flow and tracer transport

Dual‐permeability model for flow in shrinking soil with dominant horizontal deformation

Solute Transportin Sand Columns as Affected by Effluent Surface Tension

Contact Info

Product

Resources

About