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dual permeability

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Journal Article
Published: 01 December 2014
Vadose Zone Journal (2014) 13 (12): vzj2013.10.0181.
... been developed for preferential water flow and physical nonequilibrium solute transport. Among these models, the dual-permeability approach is an interesting tool for the conceptualization and modeling of preferential flow. However, this approach has been mainly studied from a numerical point of view...
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Journal Article
Published: 01 August 2014
Vadose Zone Journal (2014) 13 (8): vzj2013.10.0183.
...Donald M. Reeves; Rishi Parashar; Karl Pohlmann; Chuck Russell; Jenny Chapman Abstract A sophisticated dual-permeability flow model of the T-tunnel complex, Rainier Mesa, Nevada National Security Site, was developed and calibrated to facilitate predictions of radionuclide transport from underground...
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Journal Article
Published: 01 May 2013
Vadose Zone Journal (2013) 12 (2): vzj2012.0091.
...) dual-permeability concept. The Br leaching was simulated for data of a Br tracer irrigation experiment on a drained field (5000 m 2 area) at Bokhorst (Germany), where soils developed from glacial till sediments. Flow and transport in 2D vertical cross-sections was described using a numerical 2D dual...
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Journal Article
Published: 01 May 2010
Vadose Zone Journal (2010) 9 (2): 213–225.
... using the dual-permeability model. This study focused on estimating the parameters of the radially symmetric dual-permeability model from cumulative infiltration measured in the surface horizon of a Haplic Luvisol. While parameters obtained from the numerical inversion of the tension disk infiltration...
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Journal Article
Published: 01 May 2010
Vadose Zone Journal (2010) 9 (2): 226–237.
... of current models needs to be examined by predictive simulations. The objective of this study was to benchmark the predictive capacity of two dual-permeability models to correctly simulate flow and transport in structured soil developed under different LULCs. Two models were benchmarked: (i...
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Journal Article
Published: 01 November 2008
Vadose Zone Journal (2008) 7 (4): 1287–1301.
... models are limited by constraints in specifying separate boundary conditions (BCs) for each pore domain. The appropriate boundary conditions for dual-permeability models have not been systematically studied or addressed in experiments. The objective of this study was to numerically evaluate the effects...
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Journal Article
Published: 01 November 2007
Vadose Zone Journal (2007) 6 (4): 735–745.
... of S1D DUAL was given by Vogel et al. (2000) and Ray et al. (2004) . Only a brief description of the models and their conceptual differences is given here. Either of the two models can be run as a single-permeability (no macropore) model or as a dual-permeability model. The two pore regions...
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Journal Article
Published: 01 August 2007
Vadose Zone Journal (2007) 6 (3): 651–667.
...-dimensional single-porosity models (1D-SPM) failed and that one-dimensional dual-permeability models (1D-DPERM) were limited in explaining both Br leaching and residual Br distribution, although tile water outflow peaks could somehow be reproduced. The objective of this paper was to analyze the tile outflow...
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Journal Article
Published: 01 January 2006
Vadose Zone Journal (2006) 5 (1): 59–76.
...J. Maximilian Köhne; Binayak P. Mohanty; Jirka Šimůnek Abstract The question of whether or not soil hydraulic parameters of dual-permeability models (DPM) can be properly identified by inverse analysis of preferential water flow data has not been resolved to date. We applied a DPM based on two...
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Journal Article
Published: 01 May 2005
Vadose Zone Journal (2005) 4 (2): 398–406.
...Mats Larsbo; Stephanie Roulier; Fredrik Stenemo; Roy Kasteel; Nicholas Jarvis Abstract We introduce an improved, one-dimensional, non-steady-state dual-permeability model (MACRO 5.1). The model simulates water flow and solute transport in the vadose zone of structured soils by coupling a high...
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Journal Article
Published: 01 August 2003
Vadose Zone Journal (2003) 2 (3): 349–357.
... macropore flow, transport, and transformation processes in the dual-permeability model MACRO. MACRO was linked to the inverse modeling package SUFI, and we used numerically generated data representing transient leaching experiments for tracers and reactive solutes in microlysimeters (21-cm height...
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Journal Article
Journal: Geophysics
Published: 15 May 2023
Geophysics (2023) 88 (3): M173–M184.
... prediction is used. (3) Inversion data are used in seismic permeability prediction. To avoid error amplification, impedance data are used instead of velocity data. In view of the preceding problems, we propose a seismic permeability prediction method based on dual factors and a genetic algorithm-optimized...
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Journal Article
Journal: Lithosphere
Publisher: GSW
Published: 17 August 2022
Lithosphere (2022) 2022 (Special 12): 8427896.
... to produce other metabolites. Therefore, in order to reduce the cost of nutrients and improve the effect of microbial oil recovery, dual-metabolite bacteria have been constructed for low-permeability reservoir. In this paper, four rhamnolipid expression plasmids are extracted from E. coli -produced...
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Journal Article
Journal: Geophysics
Published: 09 November 2016
Geophysics (2017) 82 (1): MR65–MR74.
...Ammar El Husseiny; Tiziana Vanorio ABSTRACT We have investigated the effect of micrite content and macroporosity on the porosity-permeability relationship of dual-porosity carbonates using analog samples created in the laboratory. Specifically, we control the micrite-to-coarse-grains ratio...
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Conceptual fluid production from a dual-porosity and dual-permeability reservoir with Ophiomorpha populated at three different bioturbation intensities (BI 1, 3, and 5). A) At BI 1, Ophiomorpha burrows are unconnected. As a result, fluid flow occurs predominantly from the sandstone matrix in both dual-porosity and dual-permeability reservoirs. Due to low bioturbation intensities, the Ophiomorpha burrows act as secondary fluid pathways and drain into the producing matrix. B) At BI 3, Ophiomorpha burrows are moderately to well connected. The matrix and burrows contribute relatively equally to fluid production in dual-porosity intervals. In intervals exhibiting extreme permeability contrasts (i.e., dual-permeability), the Ophiomorpha burrows act as the primary fluid pathways. C) At BI 5, Ophiomorpha burrows are fully connected. As a result, fluid flow occurs predominantly from the burrows in both dual-porosity and dual-permeability reservoirs.
Published: 01 January 2015
Fig. 14.mdash; Conceptual fluid production from a dual-porosity and dual-permeability reservoir with Ophiomorpha populated at three different bioturbation intensities (BI 1, 3, and 5). A) At BI 1, Ophiomorpha burrows are unconnected. As a result, fluid flow occurs predominantly from
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Predicted breakthrough curves for the dual-permeability model with colloid filtration theory when sticking efficiency α is (a) 0 and (b) 0.1 and the mass transfer coefficient between the fast and slow domains (Γ) = 0.0001, 0.001, 0.01, and 0.1 min−1. Other model parameters included microbe diameter dm = 1000 nm, Darcy velocity q = 0.1 cm min−1, velocity through the slow domain q1 = 0.02 cm min−1, velocity through the fast domain q2 = 0.08 cm min−1, volumetric water content θ = 0.36, θ1 = 0.18, and θ2 = 0.18. See Table 1 for all parameter values.
Published: 01 April 2017
Fig. 4. Predicted breakthrough curves for the dual-permeability model with colloid filtration theory when sticking efficiency α is (a) 0 and (b) 0.1 and the mass transfer coefficient between the fast and slow domains (Γ) = 0.0001, 0.001, 0.01, and 0.1 min −1 . Other model parameters included
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Vertical infiltration wetting fronts in synthetic dual-permeability soils as a function of interfacial saturated hydraulic conductivity Ks,a for a loamy matrix with pressure head hm and a fast-flow region of intermediate size pores with pressure head hf for (a) zero, (b) intermediate, and (c) large Ks,a values.
Published: 01 December 2014
Fig. 2. Vertical infiltration wetting fronts in synthetic dual-permeability soils as a function of interfacial saturated hydraulic conductivity K s,a for a loamy matrix with pressure head h m and a fast-flow region of intermediate size pores with pressure head h f for (a) zero, (b
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Inversion of the analytically generated data obtained for dual-permeability (DP) silt systems with small (rmin), intermediate (rmean), and large (rmax) pores using the single-permeability (SP) analytical model for single-tension infiltration (STI) and multi-tension infiltration (MTI) experiments: (a,b) total cumulative infiltration (I); (c,d) errors (Er) as a function of predicted values (I/Imax); (e) time-averaged errors as a function of the pore radius of the fast-flow region for STI; and (f) time-averaged errors as a function of the pore radius of the fast-flow region and applied suction at the surface (hsurf) for MTI. Optimized parameters are listed in Table 3.
Published: 01 December 2014
Fig. 6. Inversion of the analytically generated data obtained for dual-permeability (DP) silt systems with small ( r min ), intermediate ( r mean ), and large ( r max ) pores using the single-permeability (SP) analytical model for single-tension infiltration (STI) and multi-tension
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Measured and simulated (using the dual-permeability model) cumulative infiltrations for the Guelph permeameter test (Replicate 1) for an effective saturated hydraulic conductivity of the interface between the two pore domains Ksa = 5.3 × 10−5 (top left), Ksa = 5.3 × 10−6 (top right), Ksa = 5.3 × 10−7 (bottom left), and Ksa = 5.3 × 10−8 cm min−1 (bottom right). Cumulative macropore flux is the direct (from the well) cumulative infiltration into the macropore domain; cumulative matrix flux is the direct cumulative infiltration into the matrix domain; sum of cumulative fluxes is the sum of the direct cumulative fluxes; cumulative macropore/matrix exchange is the cumulative infiltration from the macropore domain into the matrix domain.
Published: 01 May 2010
Fig. 8. Measured and simulated (using the dual-permeability model) cumulative infiltrations for the Guelph permeameter test (Replicate 1) for an effective saturated hydraulic conductivity of the interface between the two pore domains K sa = 5.3 × 10 −5 (top left), K sa = 5.3 × 10 −6 (top
Image
Measured and simulated (using the dual-permeability model) cumulative infiltrations for the Guelph permeameter test (Replicate 1) for various scenarios (Table 3) and an effective saturated hydraulic conductivity of the interface between the two pore domains Ksa = 5.3 × 10−6 cm min−1. Cumulative macropore flux is the direct (from the well) cumulative infiltration into the macropore domain; cumulative matrix flux is the direct cumulative infiltration into the matrix domain; sum of cumulative fluxes is the sum of the direct cumulative fluxes; cumulative macropore/matrix exchange is the cumulative infiltration from the macropore domain into the matrix domain.
Published: 01 May 2010
Fig. 4. Measured and simulated (using the dual-permeability model) cumulative infiltrations for the Guelph permeameter test (Replicate 1) for various scenarios ( Table 3 ) and an effective saturated hydraulic conductivity of the interface between the two pore domains K sa = 5.3 × 10 −6 cm min