Gas diffusivity‐based characterization of aggregated soils linking to methane migration in shallow subsurface

Abstract Methane transport in soil is primarily affected by soil physical conditions such as soil texture and soil structure, soil moisture, soil‐gas diffusivity, permeability, and soil temperature. Aggregated soils have distinct soil structure with two pore regions characteristics (i.e., interaggre...

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Autores principales:	M. Shanujah, Chamindu Deepagoda T.K.K., Kathleen M. Smits, V. Shreedharan, T. G. Paramrswaran, G. L. S. Babu
Formato:	article
Lenguaje:	EN
Publicado:	Wiley 2021
Materias:	Environmental sciences GE1-350 Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/9e2334e82cac40efbecf3bb1e3b1167b
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spelling	oai:doaj.org-article:9e2334e82cac40efbecf3bb1e3b1167b2021-11-25T13:30:33ZGas diffusivity‐based characterization of aggregated soils linking to methane migration in shallow subsurface1539-166310.1002/vzj2.20135https://doaj.org/article/9e2334e82cac40efbecf3bb1e3b1167b2021-11-01T00:00:00Zhttps://doi.org/10.1002/vzj2.20135https://doaj.org/toc/1539-1663Abstract Methane transport in soil is primarily affected by soil physical conditions such as soil texture and soil structure, soil moisture, soil‐gas diffusivity, permeability, and soil temperature. Aggregated soils have distinct soil structure with two pore regions characteristics (i.e., interaggregate and intraaggregate regions) and therefore show bimodal behavior with respect to soil physical properties controlling gas migration. This study characterized an aggregated soil retrieved near a natural gas (NG) extraction site at Denver–Julesburg (D‐J) basin in northeast Colorado (USA) with respect to soil‐water characteristic (SWC), pore‐size distribution, gas diffusivity and thermal conductivity. The investigated soil exhibited distinctive two‐region characteristics, which were adequately parameterized with extended, existing, and newly developed bimodal functions. We carried out an analysis with integrated model parameters to obtain a graphical insight on the correlation of properties. In addition, CH4 concentration profiles originated from a point source representing a buried pipeline leakage at three different flow rates (6, 12, and 24 L min–1) were simulated with a numerical tool that can simulate the multiphase flow of gas mixture under dry and different saturation conditions of the soil. Simulated results highlighted pronounced effects of soil moisture and, to a lesser degree, of gas leakage rate on subsurface CH4 concentrations profiles, suggesting diffusion‐dominated movement of CH4 in subsurface.M. ShanujahChamindu Deepagoda T.K.K.Kathleen M. SmitsV. ShreedharanT. G. ParamrswaranG. L. S. BabuWileyarticleEnvironmental sciencesGE1-350GeologyQE1-996.5ENVadose Zone Journal, Vol 20, Iss 6, Pp n/a-n/a (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Environmental sciences GE1-350 Geology QE1-996.5
spellingShingle	Environmental sciences GE1-350 Geology QE1-996.5 M. Shanujah Chamindu Deepagoda T.K.K. Kathleen M. Smits V. Shreedharan T. G. Paramrswaran G. L. S. Babu Gas diffusivity‐based characterization of aggregated soils linking to methane migration in shallow subsurface
description	Abstract Methane transport in soil is primarily affected by soil physical conditions such as soil texture and soil structure, soil moisture, soil‐gas diffusivity, permeability, and soil temperature. Aggregated soils have distinct soil structure with two pore regions characteristics (i.e., interaggregate and intraaggregate regions) and therefore show bimodal behavior with respect to soil physical properties controlling gas migration. This study characterized an aggregated soil retrieved near a natural gas (NG) extraction site at Denver–Julesburg (D‐J) basin in northeast Colorado (USA) with respect to soil‐water characteristic (SWC), pore‐size distribution, gas diffusivity and thermal conductivity. The investigated soil exhibited distinctive two‐region characteristics, which were adequately parameterized with extended, existing, and newly developed bimodal functions. We carried out an analysis with integrated model parameters to obtain a graphical insight on the correlation of properties. In addition, CH4 concentration profiles originated from a point source representing a buried pipeline leakage at three different flow rates (6, 12, and 24 L min–1) were simulated with a numerical tool that can simulate the multiphase flow of gas mixture under dry and different saturation conditions of the soil. Simulated results highlighted pronounced effects of soil moisture and, to a lesser degree, of gas leakage rate on subsurface CH4 concentrations profiles, suggesting diffusion‐dominated movement of CH4 in subsurface.
format	article
author	M. Shanujah Chamindu Deepagoda T.K.K. Kathleen M. Smits V. Shreedharan T. G. Paramrswaran G. L. S. Babu
author_facet	M. Shanujah Chamindu Deepagoda T.K.K. Kathleen M. Smits V. Shreedharan T. G. Paramrswaran G. L. S. Babu
author_sort	M. Shanujah
title	Gas diffusivity‐based characterization of aggregated soils linking to methane migration in shallow subsurface
title_short	Gas diffusivity‐based characterization of aggregated soils linking to methane migration in shallow subsurface
title_full	Gas diffusivity‐based characterization of aggregated soils linking to methane migration in shallow subsurface
title_fullStr	Gas diffusivity‐based characterization of aggregated soils linking to methane migration in shallow subsurface
title_full_unstemmed	Gas diffusivity‐based characterization of aggregated soils linking to methane migration in shallow subsurface
title_sort	gas diffusivity‐based characterization of aggregated soils linking to methane migration in shallow subsurface
publisher	Wiley
publishDate	2021
url	https://doaj.org/article/9e2334e82cac40efbecf3bb1e3b1167b
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Gas diffusivity‐based characterization of aggregated soils linking to methane migration in shallow subsurface

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