The effect of non-uniform microscale distribution of sorption sites on solute diffusion in soil

Simple item page
dc.contributor.authorMasum, Shakil
dc.contributor.authorKirk, Guy J. D.
dc.contributor.authorDaly, K. R.
dc.contributor.authorRoose, T.
dc.date.accessioned2016-08-24T13:53:33Z
dc.date.available2016-08-24T13:53:33Z
dc.date.issued2016-06-23
dc.description.abstractConventional models of solute transport in soil consider only soil volumes large enough to average over microscale heterogeneities, and it is assumed that microscale variations are unimportant at the macroscale. In this research we test this assumption for cases in which the microscale distribution of solute-sorbing sites is patchy. We obtain a set of equations at the macroscale that allow for the effect of the microscale distribution with the mathematical technique of homogenization. We combine these equations with an image-based model that describes the true microscale pore geometry in a real, structured soil measured with X-ray computed tomography. The resulting models are used to test the microscale averaging assumptions inherent in conventional models. We show that, in general, macroscale diffusion is little affected by microscale variation in the distribution of sorption sites. Therefore, for most purposes the assumption of microscale averaging used in conventional models is justified. The effects of microscale heterogeneity are noticeable only when (i) the rate of sorption is slow compared with diffusion, but still fast enough to affect macroscale transport and (ii) the defined macroscale volume approaches the microscale. We discuss the effects when these conditions are meten_UK
dc.identifier.citationMasum, S. et al. (2016) The effect of non-uniform microscale distribution of sorption sites on solute diffusion in soil, European Journal of Soil Science, Vol. 67, Iss. 4, pp. 514 - 522en_UK
dc.identifier.issn1351-0754
dc.identifier.urihttp://dx.doi.org/10.1111/ejss.12353
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/10423
dc.language.isoenen_UK
dc.publisherWileyen_UK
dc.rightsAttribution 4.0 Internationalen_UK
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.titleThe effect of non-uniform microscale distribution of sorption sites on solute diffusion in soilen_UK
dc.typeArticleen_UK

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
The_effect_of_non-uniform_microscale_distribution_of_sorption_sites_on_solute_diffusion_in_soil_2016.pdf
Size:
515.24 KB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.79 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

Staff publications (SWEE)