Electrical resistance tomography experiments at the Oregon Graduate Institute

Daily, William; Ramirez, Abelardo; LaBrecque, Doug; Barber, William C.

doi:10.1016/0926-9851(95)90043-8

Cited by 57 publications

(14 citation statements)

References 9 publications

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“…An air injection well was located just 41 cm from this plane and there is probably some entrained air remaining in the formation near this well. We saw similar long term behavior after an earlier sparging event (Daily et al, 1995).…”

Section: Hz Datasupporting

confidence: 59%

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Electrical impedance tomography of the 1995 OGI gasoline release

Daily¹,

Ramirez²

1996

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Section: Hz Datasupporting

confidence: 59%

“…We believe these anomalies are an indirect indicator of the LNAPL (Daily et al, 1995) moving into a soil of heterogeneous permeability. We point out that the LNAPL anomaly in plane L2-L3 is influenced by the small aspect ratio (height./width) of that image plane.…”

Section: Hz Datamentioning

confidence: 99%

Electrical impedance tomography of the 1995 OGI gasoline release

Daily¹,

Ramirez²

1996

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“…Street et al [12] used the CBP method to detect seepage from a leaking PVC lined tailings pond. Daily et al [16] evaluated the use of electrical resistance tomography (ERT) to detect a controlled gasoline spill and hydrocarbon leaks from above ground storage tanks. Osiensky [15] simulated CBP measurements to define plume length and center of mass for several hypothetical contaminant plumes.…”

Section: Introductionmentioning

confidence: 99%

Charged Body Potential Monitoring of an Electrolyte Plume Emanating from a Dripping Source

Nimmer

Osiensky

2003

Journal of Environmental Science and Health, Part A

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Hole-surface charged body potential (CBP) measurements were taken over a 173-day period during a drip-injection, tracer experiment in partially saturated, fractured basalt. A continuous, enhanced conductivity, potassium chloride (KCl) solution was dripped into the fractured basalt and energized directly through a current electrode placed in the conductive solution. The constant concentration, KCl solution was introduced above a perched water table at an average rate of 10.07 L/day under a constant hydraulic head for 76 days. The KCl drip period was followed by a 34-day tap water drip period and a 62-day drainage period. Hole-surface CBP measurements were taken over time to delineate the evolution of the asymmetrical, vadose zone, plume. A 15 by 15 grid of land surface based, porous pot electrodes (copper sulfate), located symmetrically about the centrally located injection borehole, was used for the hole-surface CBP experiment. Ratios of electrical potentials measured at the land surface over time were contoured and profiled to delineate the evolution of the electrolyte plume.

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“…Although this may seem high, expected values can be estimated using the differentiated form of Archic's Law given in Daily et al,, 1995. Initial in situ values of saturation were estimated from the neutron moisture logs that have been calibrated for Hanford soils, Values averaged about 5 % by volume, For an initial resistivity of 2600 ohm-m and a 2 % increase in saturation, the resulting resistivity vnriation is 1040 nhm-m. For the finer sands with an initial resistivity of 200 ohm-m, the estimated resistivity change is 80 ohm-m.…”

Section: Figure2mentioning

confidence: 99%

“…Field testing under various subsurface conditions of the ERT technology has been ongoing by the LLNL developers (Daily et al, 1992 Daily andRamirez, 1993;Daily et al, 1995;Daily and Ramirez, 1995). These tests include monitoring steam flcods and air stripping injection experiments plus conducting water leak tests.…”

Section: Introductionmentioning

confidence: 99%

Electrical Resistivity Tomography at the DOE Hanford Site

Narbutovskih¹,

Daily²,

Ramirez³

et al. 1996

Symposium on the Application of Geophysics to Engineering and Environmental Problems 1996

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Electrical resistivity tomography is a cross-borehole, imaging technique for mapping subsurface resistivhy variations.Elec&xles are placed at predetermined depths in an array of boreholes. Elechical current is introduced into one electrcde pair located in one borehole while the resulting voltage change is detected between electrode pairs in other boreholes similar to a surface dipole-dipole amay. These data we topographically invexted to image temporal resistivhy contrasts associated with an infiltration event. Thus a dynamic plume is spatially mapped as a function of time.As a long-tam vadose zone monitoring method, different field conditions and performance requirements exist than those for short term tank leak detection. To test ERT under these condkions, two vertical electiode amays were constructed to a depth of 160 feet with a linear surface array between boreholes. The fielding was used to facilitate the technology transfer tiom LLNL to the Hanford RCRA progmm. Installation methcds, commercial equipment and acquisition mode were evaluated to determine economic and t.dmical feasibilhy to assist desigp of long-tam monitoring networks. Prelimimuy results of the training test are presented.Until recently, vadose zone monitoring techniques could provide only Iccal point or linear coverage for leak detection and thus, are used primwily under liquid collection systems at land disposal units. As developed by LLNL, ERT can provide areal coverage under waste treatment and storage facilities given the right conditions. Advantages of ERT tõ oundwater protection programs are explored along with suggestions for future uses where ERT can be employed today.

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Electrical resistance tomography experiments at the Oregon Graduate Institute

Cited by 57 publications

References 9 publications

Electrical impedance tomography of the 1995 OGI gasoline release

Electrical impedance tomography of the 1995 OGI gasoline release

Charged Body Potential Monitoring of an Electrolyte Plume Emanating from a Dripping Source

Electrical Resistivity Tomography at the DOE Hanford Site

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