A particle-based model of size or anion exclusion with application to microbial transport in Porous Media
This paper presents a novel approach to the quantification of pore-scale exclusion processes, based on the truncation of the distribution of local dispersive displacements in a random-walk particle model. This approach increases the mean velocity of colloidal-sized particles relative to inert solute tracers, and decreases the apparent dispersion. An equivalent continuum (concentration-based) model, with modified velocity and dispersion parameters, is derived. The model was applied to the results of laboratory experiments on bacterial transport in intact cores from a research site near Oyster, Virginia. The significant observed decrease in bacterial arrival times relative to a bromide tracer was closely reproduced by the particle-based model with modest degrees of truncation (8% maximum). The approach provides a conceptually consistent means of incorporating the exclusion process into groundwater transport models.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 15010157
- Report Number(s):
- PNNL-SA-33089; KP1301010
- Journal Information:
- Water Resources Research, 39(NO. 4):1080, Journal Name: Water Resources Research, 39(NO. 4):1080
- Country of Publication:
- United States
- Language:
- English
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