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Significance of Low-Velocity Zones on Solute Retention in Rough Fractures
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering. AMPHOS21 Consulting SL, Barcelona, Spain..ORCID iD: 0000-0001-6822-8544
AMPHOS21 Consulting SL, Barcelona, Spain..ORCID iD: 0000-0003-1351-2788
Oak Ridge Natl Lab, Environm Sci Div, Oak Ridge, TN USA..
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Resources, Energy and Infrastructure.ORCID iD: 0000-0002-5665-747x
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2024 (English)In: Water resources research, ISSN 0043-1397, E-ISSN 1944-7973, Vol. 60, no 4, article id e2023WR036221Article in journal (Refereed) Published
Abstract [en]

Natural fractures are characterized by high internal heterogeneity. This internal variability is the cause of flow channeling, which in turn leads to contaminant transport taking place primarily along the high-velocity channels. Mass exchange between the high-velocity channels and the low-velocity zones has the potential to enhance contaminant retention, due to solute diffusion into the low-velocity zones and subsequent exposure to additional surface area for diffusion into the bordering rock matrix. Here, we derive a random walk particle tracking method for heterogeneous fractures, which includes an additional term to account for the aperture gradient. The method takes into account advection, diffusion in the fracture and matrix diffusion. The developed numerical framework is applied to assess the effect of low-velocity zones in rough self-affine fractures. The results show that diffusion into low-velocity zones has a visible but modest impact on contaminant retention. The magnitude of this impact does not change considerably, regardless of whether diffusion into the rock matrix is considered in the model, and increases for a decreasing average Peclet number of the fracture. Natural fractures are highly heterogeneous, comprising flowing channels and lower-velocity zones We study the effects that diffusion into low-velocity zones has in contaminant transport through rough fractures Accounting for diffusion in low-velocity zones has a relatively modest impact on contaminant retention

Place, publisher, year, edition, pages
American Geophysical Union (AGU) , 2024. Vol. 60, no 4, article id e2023WR036221
Keywords [en]
fractured media, rough fractures, molecular diffusion, diffusion into a rock matrix
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:kth:diva-345563DOI: 10.1029/2023WR036221ISI: 001195803300001Scopus ID: 2-s2.0-85189625720OAI: oai:DiVA.org:kth-345563DiVA, id: diva2:1851174
Note

QC 20240412

Available from: 2024-04-12 Created: 2024-04-12 Last updated: 2024-04-18Bibliographically approved

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Sanglas, JordiCvetkovic, VladimirSelroos, Jan-OlofZou, Liangchao

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Sanglas, JordiTrinchero, PaoloCvetkovic, VladimirSelroos, Jan-OlofZou, Liangchao
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