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Derivation of a macroscopic model for transport of strongly sorbed solutes in the soil using homogenization theory

Record type: Article

In this paper we derive a model for the diffusion of strongly sorbed solutes in soil taking into account diffusion within both the soil fluid phase and the soil particles. The model takes into account the effect of solutes being bound to soil particle surfaces by a reversible nonlinear reaction. Effective macroscale equations for the solute movement in the soil are derived using homogenization theory. In particular, we use the unfolding method to prove the convergence of nonlinear reaction terms in our system. We use the final, homogenized model to estimate the effect of solute dynamics within soil particles on plant phosphate uptake by comparing our double-porosity model to the more commonly used single-porosity model. We find that there are significant qualitative and quantitative differences in the predictions of the models. This highlights the need for careful experimental and theoretical treatment of plant-soil interaction when trying to understand solute losses from the soil.

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Citation

Ptashnyk, Mariya and Roose, Tiina (2010) Derivation of a macroscopic model for transport of strongly sorbed solutes in the soil using homogenization theory SIAM Journal on Applied Mathematics, 70, (7), pp. 2097-2118. (doi:10.1137/080729591).

More information

Published date: 14 April 2010
Keywords: homogenization, reaction-diffusion systems, reactive flows, unfolding method, double porosity, strongly sorbed solutes
Organisations: Bioengineering Sciences

Identifiers

Local EPrints ID: 145121
URI: http://eprints.soton.ac.uk/id/eprint/145121
ISSN: 0036-1399
PURE UUID: 2eb6c78d-66fb-4cd4-bd8e-0eeea7f8125a

Catalogue record

Date deposited: 23 Apr 2010 08:30
Last modified: 18 Jul 2017 23:06

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