Modeling depth-variant and domain-specific sorption and biodegradation in dual-permeability media

Ray, Chittaranjan; Vogel, Tomáš; Dušek, Jaromír

doi:10.1016/j.jconhyd.2003.08.009

Cited by 55 publications

(52 citation statements)

References 46 publications

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“…A heterogeneous parameterisation of adsorption parameter between the soil matrix and the connected flow paths (e.g. as suggested by Ray et al, 2004) did not lead to a clear improvement. The retardation characteristics of the soil at the study site are probably more heterogeneous, both in the soil matrix and the soil macropores, when considering effects like macropore coating (e.g.…”

Section: Clear Deficiencies To Reproduce Observed Pesticides Leachingmentioning

confidence: 90%

A novel explicit approach to model bromide and pesticide transport in connected soil structures

Klaus

Zehe

2011

Hydrol. Earth Syst. Sci.

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Abstract. The present study tests whether an explicit treatment of worm burrows and tile drains as connected structures is feasible for simulating water flow, bromide and pesticide transport in structured heterogeneous soils at hillslope scale. The essence is to represent worm burrows as morphologically connected paths of low flow resistance in a hillslope model. A recent Monte Carlo study (Klaus and Zehe, 2010, Hydrological Processes, 24, p. 1595-1609 revealed that this approach allowed successful reproduction of tile drain event discharge recorded during an irrigation experiment at a tile drained field site. However, several "hillslope architectures" that were all consistent with the available extensive data base allowed a good reproduction of tile drain flow response. Our second objective was thus to find out whether this "equifinality" in spatial model setups may be reduced when including bromide tracer data in the model falsification process. We thus simulated transport of bromide for the 13 spatial model setups that performed best with respect to reproduce tile drain event discharge, without any further calibration. All model setups allowed a very good prediction of the temporal dynamics of cumulated bromide leaching into the tile drain, while only four of them matched the accumulated water balance and accumulated bromide loss into the tile drain. The number of behavioural model architectures could thus be reduced to four. One of those setups was used for simulating transport of Isoproturon, using different parameter combinations to characterise adsorption according to the Footprint data base. Simulations could, however, only reproduce the observed leaching behaviour, when we allowed for retardation coefficients that were very close to one.

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Section: Clear Deficiencies To Reproduce Observed Pesticides Leachingmentioning

confidence: 90%

A novel explicit approach to model bromide and pesticide transport in connected soil structures

Klaus

Zehe

2011

Hydrol. Earth Syst. Sci.

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“…For a detailed review and discussion of the problems involved see Šimůnek et al (2003) and Jarvis (2007). In this article, we used a first-order formulation which is quite similar to the one of Ray et al (2004). The parameter β(−) is the transfer coefficient for saturated conditions and λ α the mobility, which is here computed with the relative permeability of the upstream domain.…”

Section: Two-phase Flow Equationsmentioning

confidence: 99%

“…Further we developed one-dimensional finite-volume codes (C++/Python) to compare RDPM and TPDPM. A firstorder Waren-Root-Type (Warren and Root 1963) mass transfer term (see also Gerke and van Genuchten 1993b;Ray et al 2004) was chosen to compute mass transfer of water and air between matrix and macropore domain. As the exact geometry of pores and aggregates on the slope scale is not measurable and further effects like coating and mineralized layers can inhibit the exchange dramatically, the uncertainty of the larger scale and the error made by lumping different macropores into a domain is dominant, so that there are hardly advantages in using higher order transfer terms or a MINC model (Pruess 1985).…”

Section: Introductionmentioning

confidence: 99%

Modeling Macroporous Soils with a Two-Phase Dual-Permeability Model

2012

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Fast water infiltration during heavy rainfall events is an important issue for hillslope hydrology and slope stability. Most hillslopes are strongly heterogeneous and contain macropores and soil pipes, so that infiltrating water can bypass the soil matrix and reach rapidly deeper regions. Water infiltration into macroporous soils is usually simulated with dual-permeability models based on Richards equation (RDPM) which only describes water flow. In this article, we present a two-phase dual-permeability model (TPDPM) for simulating water and air flow in macroporous soils. Water and air flow are simulated in both domains and mass transfer for water and air between the domains is included with first-order transfer terms. The main objectives of this article are to discuss the differences between TPDPM and RDPM and to test the application of the TPDPM on the slope scale. First, the differences between RDPM and TPDPM were studied using a one-dimensional layered soil. For the chosen high infiltration rate, we observed significant differences in the macropore domain and small differences in the matrix depending on the transfer parameter. Second, we applied the model to simulate fast water infiltration and flow through an alpine hillslope, where the water flow mainly occurs in the macropore domain and the matrix domain is bypassed because it is low permeability. A good agreement of simulated and measured travel times of Wienhöfer et al. (Hydrol Earth Syst Sci 13(7):1145-1161, 2009) was obtained. Finally, we recommend using TPDPM for high infiltration in layered macroporous soils.

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“…However, the "dual" Richards' approach is largely adopted even in presence of fractures (noncapillary pores). Several applications of the model to flow and transport in structured soil proposed by Gerke and van Genuchten [1993a] and using Richards equation for both domains may be found in the literature [e.g., Gerke and Köhne, 2004;Ray et al, 2004;Dušek et al, 2006]. Even if such an approach may not appear strictly correct for a fractured pore system, it may be justified if one considers that changes from mostly matrix flow to mostly macropore flow are gradual and dynamic.…”

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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Modeling depth-variant and domain-specific sorption and biodegradation in dual-permeability media

Cited by 55 publications

References 46 publications

A novel explicit approach to model bromide and pesticide transport in connected soil structures

A novel explicit approach to model bromide and pesticide transport in connected soil structures

Modeling Macroporous Soils with a Two-Phase Dual-Permeability Model

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

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