The dual‐domain porosity apparatus: Characterizing dual porosity at the sediment/water interface
Groundwater
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Abstract
The characterization of pore-space connectivity in porous media at the sediment/water interface is critical to understanding contaminant transport and reactive biogeochemical processes in zones of groundwater and surface-water exchange. Previous in situ studies of dual-domain (i.e.,
mobile/less-mobile porosity) studies have been limited to solute tracer injections at scales of meters to 100s of meters and subsequent numerical model parameterization using fluid concentration histories. Pairing fine-scale (e.g., sub-meter) geoelectrical measurements with fluid tracer data over time alleviates dependence on flowpath-scale experiments, enabling spatially targeted characterization of shallow sediment/water interface media where biogeochemical reactivity is often high. The Dual-Domain Porosity Apparatus is a field-tested device capable of variable rate-controlled downward flow experiments. The Dual-Domain Porosity Apparatus facilitates meter-scale inference of dual-domain parameters, i.e., mobile/less-mobile exchange rate coefficient and the ratio of less mobile to mobile porosity. The Dual-Domain Porosity Apparatus experimental procedure uses water electrical conductivity as a conservative tracer of differential loading and flushing of pore spaces within the region of measurement. Variable injection rates permit the direct quantification of the flow-dependence of dual-domain parameters, which has been theorized for decades but remains challenging to assess using existing experimental methodologies.
Suggested Citation
Scruggs, C.R., Briggs, M.A., Day-Lewis, F.D., Werkema, D.D., Lane, J., 2019, The dual‐domain porosity apparatus: Characterizing dual porosity at the sediment/water interface: Groundwater, v. 57, no. 4, p. 640-646, https://doi.org/10.1111/gwat.12846.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | The dual‐domain porosity apparatus: Characterizing dual porosity at the sediment/water interface |
| Series title | Groundwater |
| DOI | 10.1111/gwat.12846 |
| Volume | 57 |
| Issue | 4 |
| Publication Date | December 13, 2018 |
| Year Published | 2019 |
| Language | English |
| Publisher | Wiley |
| Contributing office(s) | WMA - Earth System Processes Division |
| Description | 7 p. |
| First page | 640 |
| Last page | 646 |