Electromagnetic experiment to map in situ water in heated welded tuff: Preliminary results

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An experiment was conducted in Tunnel Complex G at the Nevada Test Site to evaluate geotomography as a possible candidate for in situ monitoring of hydrology in the near field of a heater placed in densely welded tuff. Alterant tomographs of 200 MHz electromagnetic permittivity were made for a vertical and a horizontal plane. After the 1 kilowatt heater was turned on, the tomographs indicated a rapid and strong drying adjacent to the heater. Moisture loss was not symmetric about the heater, but seemed to be strongly influenced by heterogeneity in the rock mass. The linear character of many tomographic ... continued below

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12 p.

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Ramirez, A.L. & Daily, W.D. March 16, 1987.

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Description

An experiment was conducted in Tunnel Complex G at the Nevada Test Site to evaluate geotomography as a possible candidate for in situ monitoring of hydrology in the near field of a heater placed in densely welded tuff. Alterant tomographs of 200 MHz electromagnetic permittivity were made for a vertical and a horizontal plane. After the 1 kilowatt heater was turned on, the tomographs indicated a rapid and strong drying adjacent to the heater. Moisture loss was not symmetric about the heater, but seemed to be strongly influenced by heterogeneity in the rock mass. The linear character of many tomographic features and their spatial correlation with fractures mapped in boreholes are evidence that drying was most rapid along some fractures. When the heater was turned off, an increase in moisture content occurred around the heater and along the dry fractures. However, this process is much slower and the magnitude of the moisture increase much smaller than the changes observed during heating of the rock. The interpretation of the tomographs is preliminary until they can be processed without the restrictive assumption of straight ray paths for the signals through the highly heterogeneous rock mass. 15 refs., 4 figs.

Physical Description

12 p.

Notes

NTIS, PC A02/MF A01; OSTI as DE88000241

Source

  • 28. U.S. symposium on rock mechanics, Tucson, AZ (United States), 29 Jun - 1 Jul 1987

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  • Other: DE88000241
  • Report No.: UCRL--96318
  • Report No.: CONF-870625--18
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 60131
  • Archival Resource Key: ark:/67531/metadc689640

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • March 16, 1987

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • Feb. 23, 2016, 1:33 p.m.

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Ramirez, A.L. & Daily, W.D. Electromagnetic experiment to map in situ water in heated welded tuff: Preliminary results, article, March 16, 1987; California. (digital.library.unt.edu/ark:/67531/metadc689640/: accessed September 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.