A numerical model for preferential solute movement in structured soils

Steenhuis, Tammo S.; Parlance, J.-Y.; Andreini, M.

doi:10.1016/0016-7061(90)90015-2

Cited by 58 publications

(23 citation statements)

References 24 publications

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“…For the treatment of lateral mass exchange between the regions, two extreme cases can be distinguished: an equal interaction between all pore classes (Steenhuis et al, 1990) and an interaction that is most intense for neighboring classes (Skopp and Gardner, 1992;Durner and Flühler, this issue)). The flow resistance for solute exchange between the regions must be specified in such models.…”

Section: Multiple Flow Regions With Lateral Mass Exchangementioning

confidence: 99%

“…The flow resistance for solute exchange between the regions must be specified in such models. Extreme cases are equal interaction between all pore classes (Steenhuis et al, 1990) or an interaction which defines for each pore class one or two neighborhood classes (Skopp and Gardner, 1992;Roth et al, 1990;Durner and Flühler, this issue). A flexible way to model this is to introduce an additional structural non-cartesian coordinate, which can represent pore sizes, velocities, or a measure of spatial distance between pore regions.…”

Section: Multiple Flow Regions With Lateral Mass Exchangementioning

confidence: 99%

“…1) can be generated by adjusting the lateral diffusion coefficient D and the relative proportions of the flow regions of different longitudinal v i and D z . Steenhuis et al (1990) developed a mixing cell model where the soil is subdivided into multiple flow regions that represent different pore-size classes. The sizes of the pore-classes and the water flow velocities within them depend on the unsaturated conductivity function.…”

Section: Multiple Flow Regions With Lateral Mass Exchangementioning

confidence: 99%

“…At each time step and for each cell, a certain fraction i of the soil solution of pore class i is moved into a common pool, where it is mixed and replaced. The solute content s i is changed to s 0 i (Steenhuis et al, 1990) …”

Section: Multiple Flow Regions With Lateral Mass Exchangementioning

confidence: 99%

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Lateral solute mixing processes — A key for understanding field-scale transport of water and solutes

Flühler¹,

1996

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Flühler, H., Durner, W. and Flury, M. 1995. Lateral Solute Mixing Processes-A Key for Understanding and Modeling Field-Scale Transport of Water and Solutes. Geoderma, 00: 000-000.Lateral mass exchange mechanisms affect the spreading of solutes in the main direction of flow. Modeling vertical solute spreading requires therefore an understanding of the lateral transport across regions of varying velocities. Experimental observations show that the variable extent and rates of lateral mixing cause dramatically different transport regimes, which can neither be predicted nor explained mechanistically in terms of known state variables. In this paper we show that the various solute flow regimes are sensitive to the relative magnitudes of the vertical and lateral solute particle velocities. We discuss the concepts of describing lateral mass exchange as used in conceptually different transport models, and we postulate that physically meaningful parameters describing the lateral mixing would be a clue for deciding a priori which solute transport regime is appropriate in a particular soil or soil horizon.

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Section: Multiple Flow Regions With Lateral Mass Exchangementioning

confidence: 99%

Section: Multiple Flow Regions With Lateral Mass Exchangementioning

confidence: 99%

Section: Multiple Flow Regions With Lateral Mass Exchangementioning

confidence: 99%

Section: Multiple Flow Regions With Lateral Mass Exchangementioning

confidence: 99%

See 2 more Smart Citations

Lateral solute mixing processes — A key for understanding field-scale transport of water and solutes

Flühler¹,

1996

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“…The rigidity assumption has been used not only for analyzing uniform flow in relatively homogeneous soil [e.g., Belmans et al, 1983] but also for modeling preferential flow in structured and macroporous soil systems [e.g., Germann and Beven, 1985;Steenhuis et al, 1990;Gerke and van Genuchten, 1993a;Wallach et al, 1998]. Exceptions from the rigidity assumption are often focusing on soil mechanical concepts in which hydraulic properties are included [e.g., Richards, 1986;Baumgartl and Köck, 2004].…”

Section: Introductionmentioning

confidence: 99%

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

Coppola

Gerke

Comegna

et al. 2012

Water Resources Research

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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.

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Solute Transport in Soil at the Core and Field Scale

Vanclooster

Javaux

Vanderborght

2005

Encyclopedia of Hydrological Sciences

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A detailed understanding of the flow and transport processes of chemicals in soils is needed to implement effective and efficient soil and water management strategies and to meet the current challenges of sustainable development. The solute transport process is a key process determining the mass flow of chemical substances once they are released in the soil solution. The transport process is a highly nonlinear and space‐time dynamic process for which models are still poorly validated at the larger scale. In this article, we review some recent advances in describing solute transport in soil at the macroscopic core scale, corresponding to the scale of most soil measurement devices, and the pedon scale, corresponding to the scale of a small field. After introducing basic concepts, major problems using the classical Convection Dispersion Equation (CDE) model for describing field‐scale solute transport is presented and alternative modeling concepts are introduced.

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A numerical model for preferential solute movement in structured soils

Cited by 58 publications

References 24 publications

Lateral solute mixing processes — A key for understanding field-scale transport of water and solutes

Lateral solute mixing processes — A key for understanding field-scale transport of water and solutes

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

Solute Transport in Soil at the Core and Field Scale

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