Electrical resistance tomography to monitor vadose water movement
- Lawrence Livermore National Lab., CA (United States)
- Arizona Univ., Tucson, AZ (United States)
We report results of one test in which Electrical Resistance Tomography (ERT) was used to map the changes in electrical resistivity in the vadose zone as a function of time while water infiltration occurred. The ERT images were used to infer shape and movement of the infiltration plume in the unsaturated soil. We supplied a continuous water source at a point about 10 feet below the surface (at the end of a shallow screened hole) for only a short time -- 2.5 hours. This pulsed source introduced a slug'' of water whose infiltration was followed to about 60 foot depth during a 23 hour period. The ERT images show resistivity decreases as the water content of the vadose zone increased while water was added to the soil; the resistivity of the soil later increased after the supply of water was cut-off and the induced soil moisture began to subside.
- Research Organization:
- Lawrence Livermore National Lab., CA (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6263667
- Report Number(s):
- UCRL-JC-108155; CONF-910981-44; ON: DE92003064
- Resource Relation:
- Conference: Environmental remediation '91 conference, Pasco, WA (United States), 8-11 Sep 1991
- Country of Publication:
- United States
- Language:
- English
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