Three-dimensional quantification of soil hydraulic properties using X-ray computed tomography and image-based modeling

Tracy, Saoirse R. and Daly, Keith R. and Sturrock, Craig J. and Crout, Neil M.J. and Mooney, Sacha J. and Roose, Tiina (2015) Three-dimensional quantification of soil hydraulic properties using X-ray computed tomography and image-based modeling. Water Resources Research, 51 (2). pp. 1006-1022. ISSN 1944-7973

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Abstract

We demonstrate the application of a high-resolution X-ray Computed Tomography (CT) method to quantify water distribution in soil pores under successive reductive drying. We focus on the wet end of the water release characteristic (WRC) (0 to −75 kPa) to investigate changes in soil water distribution in contrasting soil textures (sand and clay) and structures (sieved and field structured) and to determine the impact of soil structure on hydraulic behavior. The 3-D structure of each soil was obtained from the CT images (at a 10 μm resolution). Stokes equations for flow were solved computationally for each measured structure to estimate hydraulic conductivity. The simulated values obtained compared extremely well with the measured saturated hydraulic conductivity values. By considering different sample sizes we were able to identify the smallest possible representative sample size which is required to determine a globally valid hydraulic conductivity.

Item Type: Article
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Biosciences
Identification Number: 10.1002/2014WR016020
Depositing User: Eprints, Support
Date Deposited: 09 Mar 2017 14:03
Last Modified: 13 Oct 2017 01:31
URI: http://eprints.nottingham.ac.uk/id/eprint/41200

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