SciCADE 2013
International Conference on Scientific Computation and Differential Equations
September 16-20, 2013, Valladolid (Spain)

Invited Talk

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Multiscale image based modelling of two phase flow in soil

K. Daly and T. Roose

Abstract
Processes governing fluid flow in soil and the water uptake by plant roots are inherently multiscale. The internal pore structure of soil aggregates and the wider pore space between them contribute to the global behaviour of soils. Using homogenization we approximate the effects of soil structure on the global flow properties by considering three scales. The behaviour of the soil aggregate is determined by considering a sub sample of the aggregate structure and a representative boundary region. This allows an aggregate scale hydraulic conductivity and a set of boundary conditions to be determined. A second level of averaging allows the macroscopic behaviour of a collection of aggregates to be obtained. Application of this process to X-ray CT images of real soil allows us to answer fundamental questions regarding the interaction of roots in soil and feeds back into the resolution driven imaging of soils by providing a lower limit to the scale of features which affect flow properties.

Organized by         Universidad de Valladolid     IMUVA