Journal ArticleDOI
Numerical modelling of fluid flow through unsaturated zone using a dual-porosity approach
TLDR
In this article, an attempt has been made to model fluid flow through a geological unit consisting of sandy-clay and clayey soil with significant macro pores, and the results suggest that the depths associated with soil moisture fronts are significantly different by applying a dual continuum approach with reference to the co...Abstract:
In this study, an attempt has been made to model fluid flow through a geological unit consisting of sandy-clay and clayey soil with significant macro pores. Considering such a geological formation using a single-continuum approach may not always be justified as the porosity and permeability contrast between the soil matrix and macro pore vary by several orders of magnitude and not by a scale factor. Under such circumstances, deducing the mean values of parameters such as porosity and permeability using conventional Representative Elementary Volume from a single continuum becomes nearly impossible. For this purpose, a numerical model has been developed to investigate the consequences of applying both equilibrium model or Single-Porosity Medium (SPM) and non-equilibrium model or Dual-Porosity Medium (DPM) approaches for the same soil types. Numerical results suggest that the depths associated with soil moisture fronts are significantly different by applying a dual continuum approach with reference to the co...read more
Citations
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Numerical modelling on fate and transport of coupled adsorption and biodegradation of pesticides in an unsaturated porous medium
TL;DR: In this article, a one-dimensional numerical model is developed to simulate the transport of pesticides in an unsaturated porous medium, considering the effect of adsorption and microbial degradation with inhibition in addition to conventional advective and dispersive transport.
Journal ArticleDOI
Reply to ``Comments on An Adaptive Finite Difference Scheme for the One-Dimensional Water Flow Equation''
J. H. Dane,F. H. Mathis +1 more
TL;DR: An adaptive grid scheme for the solution of problems involving sharp fronts is best implemented by varying the number of grid points in the solution rather than by rearranging existing nodes, so that the required accuracy can be maintained for a minimum cost.
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Effective saturation-based weighting for interblock hydraulic conductivity in unsaturated zone soil water flow modelling using one-dimensional vertical finite-difference model
TL;DR: Shanmugam et al. as discussed by the authors proposed an effective saturation-based weighting approach in the soil hydraulic curve functions for estimating interblock hydraulic conductivity using a one-dimensional vertical finite-difference model.
References
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Journal ArticleDOI
A closed-form equation for predicting the hydraulic conductivity of unsaturated soils
van Genuchten,M. Th. +1 more
TL;DR: Van Genuchten et al. as mentioned in this paper proposed a closed-form analytical expression for predicting the hydraulic conductivity of unsaturated soils based on the Mualem theory, which can be used to predict the unsaturated hydraulic flow and mass transport in unsaturated zone.
Journal ArticleDOI
A General Mass-Conservative Numerical Solution for the Unsaturated Flow Equation
TL;DR: In this paper, the authors show that using the mass-conservative method does not guarantee good solutions, since the mass balance errors and erroneous estimates of infiltration depth can lead to large mass imbalance errors.
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Mass transfer studies in sorbing porous media. I. Analytical solutions
TL;DR: An analytical solution for the movement of chemicals through a sorbing porous medium with lateral or intra-aggregate diffusion is presented in this paper, where the liquid phase in the porous medium is divided into mobile and immobile regions.
Journal ArticleDOI
A dual-porosity model for simulating the preferential movement of water and solutes in structured porous media
TL;DR: In this paper, a dual-porosity model was developed for the purpose of studying variably saturated water flow and solute transport in structured soils or fractured rocks, where water in both pore systems is assumed to be mobile.