Colloid mobilization in a fractured soil during dry–wet cycles: role of drying duration and flow path permeability
Abstract
In subsurface soils, colloids are mobilized by infiltrating rainwater, but the source of colloids and the process by which colloids are generated between rainfalls are not clear. We examined the effect of drying duration and the spatial variation of soil permeability on the mobilization of in situ colloids in intact soil cores (fractured and heavily weathered saprolite) during dry-wet cycles. Measuring water flux at multiple sampling ports at the core base, we found that water drained through flow paths of different permeability. The duration of antecedent drying cycles affected the amount of mobilized colloids, particularly in high-flux ports that received water from soil regions with a large number of macro- and mesopores. In these ports, the amount of mobilized colloids increased with increased drying duration up to 2.5 days. For drying durations greater than 2.5 days, the amount of mobilized colloids decreased. In contrast, increasing drying duration had a limited effect on colloid mobilization in low-flux ports, which presumably received water from soil regions with fewer macro- and mesopores. On the basis of these results, we attribute this dependence of colloid mobilization upon drying duration to colloid generation from dry pore walls and distribution of colloids in flow paths, which appear to be sensitive to the moisture content of soil after drying and flow path permeability. The results are useful for improving the understanding of colloid mobilization during fluctuating weather conditions.
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Natural environmental conditions such as dry-wet and freeze-thaw cycles have been shown to accelerate the release of mobile particles in the subsurface.
“In particular, natural environmental conditions such as dry-wet and freeze-thaw cycles have been shown to accelerate the release of mobile particles in the subsurface (Mohanty et al., 2014(Mohanty et al., , 2015)).”
From Perfluoroalkyl acids on suspended particles: Significant transport pathways in surface runoff, surface waters, and subsurface soils (2021) · cites this paper as Mohanty et al., 2015
The same processes that release PFAA from air-water interfaces release soil particulates.
“The same processes release soil particulates (Mohanty et al., 2014(Mohanty et al., , 2015)).”
From Perfluoroalkyl acids on suspended particles: Significant transport pathways in surface runoff, surface waters, and subsurface soils (2021) · cites this paper as Mohanty et al., 2015
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- Authors
- Mohanty, S. K., Saiers, J. E., & Ryan, J. N.
- Affiliations
- University of Colorado Boulder (US)
- Yale University (US)
- Corresponding author
- Mohanty, Sanjay K.
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 2015-07-15
- Volume
- 49
- Issue
- 15
- Pages
- 9100-9106
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W2434700571
- Cited by
- 90
- References
- 40
- Citations by year
- 2026: 10 · 2025: 8 · 2024: 6 · 2023: 6 · 2022: 12 · 2021: 10 · 2020: 11 · 2019: 7 · 2018: 3 · 2017: 9 · 2016: 7 · 2015: 1
- FWCI
- 11.03
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Environmental Science & Technology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- U.S. Department of Energy (DOE-FG02-08ER64639)
- Topics
- Physical Sciences › Engineering › Civil and Structural Engineering › Soil and Unsaturated Flow
- Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil erosion and sediment transport
- Physical Sciences › Environmental Science › Environmental Engineering › Groundwater flow and contamination studies
- Keywords
- colloid mobilization, wetting-drying cycles, drying time, saprolite, soil moisture, water flux, soil core
- MeSH terms
- Colloids, Desiccation, Particle Size, Permeability, Soil, Water, Water Movements
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