Exposure-time based modeling of nonlinear reactive transport in porous media subject to physical and geochemical heterogeneity

Journal of Contaminant Hydrology
Alicia Sanz-PratOlaf A Cirpka

Abstract

Transport of reactive solutes in groundwater is affected by physical and chemical heterogeneity of the porous medium, leading to complex spatio-temporal patterns of concentrations and reaction rates. For certain cases of bioreactive transport, it could be shown that the concentrations of reactive constituents in multi-dimensional domains are approximately aligned with isochrones, that is, lines of identical travel time, provided that the chemical properties of the matrix are uniform. We extend this concept to combined physical and chemical heterogeneity by additionally considering the time that a water parcel has been exposed to reactive materials, the so-called exposure time. We simulate bioreactive transport in a one-dimensional domain as function of time and exposure time, rather than space. Subsequently, we map the concentrations to multi-dimensional heterogeneous domains by means of the mean exposure time at each location in the multi-dimensional domain. Differences in travel and exposure time at a given location are accounted for as time difference. This approximation simplifies reactive-transport simulations significantly under conditions of steady-state flow when reactions are restricted to specific locations. It is not...Continue Reading

References

Nov 27, 2001·Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA·A HaarstrickD Dinkler
Oct 29, 2002·Journal of Contaminant Hydrology·Olaf A Cirpka
Feb 24, 2006·Journal of Contaminant Hydrology·Uma Seeboonruang, T R Ginn
Sep 15, 2007·Journal of Contaminant Hydrology·Jeffrey A Cunningham, Ziad J Fadel
Jul 9, 2010·Journal of Contaminant Hydrology·Marco DentzJesus Carrera
Feb 28, 2015·Journal of Contaminant Hydrology·Alicia Sanz-PratOlaf A Cirpka
Feb 6, 2016·Journal of Contaminant Hydrology·Alicia Sanz-PratOlaf A Cirpka

Citations

Feb 20, 2020·Physical Review. E·Tomás Aquino, Marco Dentz

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