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Title: Pore network modeling of the electrical signature of solute transport in dual-domain media: Dual-Domain Electrical Signature

Dual-domain models are used to explain anomalous solute transport behavior observed in diverse hydrologic settings and applications, from groundwater remediation to hyporheic exchange. To constrain such models, new methods are needed with sensitivity to both immobile and mobile domains. Recent experiments indicate that dual-domain transport of ionic tracers has an observable geoelectrical signature, appearing as a nonlinear, hysteretic relation between paired bulk and fluid electrical conductivity. Here in this paper we present a mechanistic explanation for this geoelectrical signature and evaluate assumptions underlying a previously published petrophysical model for bulk conductivity in dual-domain media. Pore network modeling of fluid flow, solute transport, and electrical conduction (1) verifies the geoelectrical signature of dual-domain transport, (2) reveals limitations of the previously used petrophysical model, and (3) demonstrates that a new petrophysical model, based on differential effective media theory, closely approximates the simulated bulk/fluid conductivity relation. These findings underscore the potential of geophysically based calibration of dual-domain models.
ORCiD logo [1] ; ORCiD logo [2] ;  [3] ; ORCiD logo [4] ; ORCiD logo [1]
  1. U.S. Geological Survey, Storrs, CT (United States). Office of Groundwater, Branch of Geophysics
  2. Univ. of Lausanne, Lausanne (Switzerland). Applied and Environmental Geophysics Group, Inst. of Earth Sciences
  3. Oregon State Univ., Corvallis, OR (United States). Research Office
  4. Colorado School of Mines, Golden, CO (United States). Hydrologic Sciences and Engineering Program, Geology and Geological Engineering Dept.
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 44; Journal Issue: 10; Journal ID: ISSN 0094-8276
American Geophysical Union
Research Org:
U.S. Geological Survey, Reston, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Country of Publication:
United States
58 GEOSCIENCES; anomalous transport; electrical resistivity; solute transport; petrophysics; hydrogeophysics; pore network modeling
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1377933