NDLI: Pore-scale modeling of water-phase fragmentation in simulated soils with realistic pore geometry

Content Provider	Springer Nature Link
Author	Furrer, Jessica M. Bagtzoglou, Amvrossios C.
Copyright Year	2017
Abstract	Bacterial diversity in soil is extremely high, and evidence suggests that spatial isolation created by fragmented aquatic microhabitats in unsaturated soil plays a large part in creating this diversity. Soil texture determines the extent and connectivity of hydrated microbial microhabitats through its influence on the pore size distribution. In this study we simulate pore-scale water retention processes in soils of varying textures. We develop a novel methodology for generating realistic soil particle shapes, conforming to experimentally-determined sphericity and roundness values for sand and silt particles. We then employ the lattice Boltzmann method, using a 3-D single-component multiphase model to simulate equilibrium water configurations in a series of simulated soils, and quantify the fragmentation of the water phase by identifying isolated water pockets that could serve as bacterial microhabitats. Pocket counts at a range of liquid saturations were dominated by filling of small pores created by domains of high silt content, which was a realistic depiction of the fragmentation behavior for the finest-textured soil. Fragmentation measures in the coarser soils showed sensitivity to a thresholding parameter controlling thickness of liquid films on rough surfaces of soil grains, indicating the importance of such films in controlling fragmentation in coarse soils. This work highlights the differential mechanisms controlling hydraulic fragmentation in soils of different textures: filling of pores due to capillary forces in finer soils, and disconnected water films on grain surfaces in coarser soils. Follow-on work will include grid refinement to better resolve the spatial distribution of surface films in coarse soils.
Starting Page	1
Ending Page	11
Page Count	11
File Format	PDF
ISSN	14345021
Journal	Granular Matter
Volume Number	19
Issue Number	2
e-ISSN	14347636
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2017-02-23
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Lattice Boltzmann Bacterial diversity Pore-scale Unsaturated soil Soft and Granular Matter, Complex Fluids and Microfluidics Engineering Fluid Dynamics Materials Science Geoengineering, Foundations, Hydraulics Industrial Chemistry/Chemical Engineering Engineering Thermodynamics, Heat and Mass Transfer
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Mechanics of Materials Materials Science

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