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Three-dimensional quantification of soil hydraulic properties using X-ray Computed Tomography and image-based modeling

Tracy, Saoirse R.; Daly, Keith R.; Sturrock, Craig J.; Mooney, Sacha J.; Crout, Neil M.J.; Roose, Tiina

Authors

Saoirse R. Tracy

Keith R. Daly

SACHA MOONEY sacha.mooney@nottingham.ac.uk
Professor of Soil Physics

NEIL CROUT neil.crout@nottingham.ac.uk
Professor of Environmental Modelling

Tiina Roose



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.

Citation

Tracy, S. R., Daly, K. R., Sturrock, C. J., Mooney, S. J., Crout, N. M., & Roose, T. (2015). Three-dimensional quantification of soil hydraulic properties using X-ray Computed Tomography and image-based modeling. Water Resources Research, 51(2), 1006-1022. https://doi.org/10.1002/2014WR016020

Journal Article Type Article
Acceptance Date Jan 6, 2015
Online Publication Date Feb 19, 2015
Publication Date 2015-02
Deposit Date Mar 9, 2017
Publicly Available Date Mar 9, 2017
Journal Water Resources Research
Print ISSN 0043-1397
Electronic ISSN 1944-7973
Publisher American Geophysical Union
Peer Reviewed Peer Reviewed
Volume 51
Issue 2
Pages 1006-1022
DOI https://doi.org/10.1002/2014WR016020
Public URL http://eprints.nottingham.ac.uk/id/eprint/41200
Publisher URL http://onlinelibrary.wiley.com/doi/10.1002/2014WR016020/abstract
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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