Electrical resistivity tomography of vadose water movement

William Daily; Abelardo Ramirez; Douglas LaBrecque; John Nitao

doi:10.1029/91wr03087

journal article May 01, 1992

Electrical resistivity tomography of vadose water movement

William Daily Abelardo Ramirez Douglas LaBrecque John Nitao

Water Resources Research Vol. 28 No. 5 pp. 1429-1442 · American Geophysical Union (AGU)

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Abstract

Cross borehole electrical resistivity tomography (ERT) was used to image the resistivity distribution before and during two infiltration experiments. In both cases water was introduced into the vadose zone, and the change in resistivity associated with the plume of wetted soil was imaged as a function of time. The primary purpose of this work was to study the capabilities and limitations of ERT to image underground structure and ground water movement in the vadose zone. A secondary goal was to learn specifics of unsaturated flow in a complex geologic setting. Tomographs of electrical resistivity taken before infiltration image coarser, well‐drained soils (sands and gravels) as more resistive zones, whereas finer grained soils (silts and clays), which hold more water by capillarity, are imaged as more conductive. Images of changes in resistivity during infiltration show growth of the water infiltration plume with time that is consistent with known geology. In the ERT images we see the effects of capillary barriers and infer differences between capillary‐driven flow through fine sediments and gravity‐driven flow through very permeable sediments. Images are consistent with numerical flow simulations using hydrological parameter values consistent with soil types inferred from well logs. ERT can be a useful tool to monitor movement of circuitous moisture fronts in a heterogeneous field setting that would go undetected by borehole measurements.

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References

Details

Published: May 01, 1992
Vol/Issue: 28(5)
Pages: 1429-1442
License: View

Authors

Cite This Article

William Daily, Abelardo Ramirez, Douglas LaBrecque, et al. (1992). Electrical resistivity tomography of vadose water movement. Water Resources Research, 28(5), 1429-1442. https://doi.org/10.1029/91wr03087

Electrical resistivity tomography of vadose water movement

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