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Title: Methods for detecting and locating leaks in containment facilities using electrical potential data and electrical resistance tomographic imaging techniques

Methods are provided for detecting and locating leaks in liners used as barriers in the construction of landfills, surface impoundments, water reservoirs, tanks, and the like. Electrodes are placed in the ground around the periphery of the facility, in the leak detection zone located between two liners if present, and/or within the containment facility. Electrical resistivity data is collected using these electrodes. This data is used to map the electrical resistivity distribution beneath the containment liner between two liners in a double-lined facility. In an alternative embodiment, an electrode placed within the lined facility is driven to an electrical potential with respect to another electrode placed at a distance from the lined facility (mise-a-la-masse). Voltage differences are then measured between various combinations of additional electrodes placed in the soil on the periphery of the facility, the leak detection zone, or within the facility. A leak of liquid though the liner material will result in an electrical potential distribution that can be measured at the electrodes. The leak position is located by determining the coordinates of an electrical current source pole that best fits the measured potentials with the constraints of the known or assumed resistivity distribution.
Inventors:
 [1];  [2];  [3]
  1. (Livermore, CA)
  2. (San Antonio, TX)
  3. (Alamo, CA)
Issue Date:
OSTI Identifier:
871121
Assignee:
Leak Location Services, Inc. (San Antonio, TX) LLNL
Patent Number(s):
US 5661406
Contract Number:
W-7405-ENG-48
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Country of Publication:
United States
Language:
English
Subject:
methods; detecting; locating; leaks; containment; facilities; electrical; potential; data; resistance; tomographic; imaging; techniques; provided; liners; barriers; construction; landfills; surface; impoundments; water; reservoirs; tanks; electrodes; placed; ground; periphery; facility; leak; detection; zone; located; resistivity; collected; map; distribution; beneath; liner; double-lined; alternative; embodiment; electrode; lined; driven; respect; distance; mise-a-la-masse; voltage; differences; measured; various; combinations; additional; soil; liquid; material; result; position; determining; coordinates; current; source; pole; fits; potentials; constraints; assumed; potential distribution; leak detection; electrical potential; electrical resistance; electrical current; electrical resistivity; current source; alternative embodiment; resistivity distribution; various combinations; voltage difference; zone located; voltage differences; tomographic imaging; liner material; electrode placed; imaging techniques; additional electrode; additional electrodes; locating leaks; /324/340/