Laboratory Measurements of Soil Electric Properties between 0.1 and 5 GHz

• Main Authors: Delaney,Allan J, Arcone,Steven A
• Other Authors: COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
• Format: Text
• Language: English
• Published: 1982
• Subjects: Soil Mechanics; Electricity and Magnetism; *Soils; Alaska; Permafrost; Silt; Sand; Dielectric properties; Measurement; Electromagnetic wave reflections; Very high frequency; Ultrahigh frequency; Superhigh frequency; Time domain; Temperature; Moisture content; Dielectric permittivity; Time domain reflectometry; PE61102A; AST24; Ice; permafrost
• Online Access: http://www.dtic.mil/docs/citations/ADA115126; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA115126

Dielectric measurements have been performed on silt and sand samples from permafrost areas using Time Domain Reflectometry. The sample temperatures were varied from +25 C to -25 C, and volumetric water content was varied between oven-dry and 0.55 gH2O/cc. The data were processed for frequencies between 0.1 and 5.0 GHz. The results show a constant K' and a low K' for frequencies up to 1 GHz. A frequency dependence seen on the data above 2 GHz is probably the result of unfrozen, adsorbed water. At moisture levels near saturation at all temperatures, these soils have excellent propagation characteristics for ground-probing radar operating below 0.3 GHz. Massive ice should be easily detectable in permafrost within a few degrees of 0 C. (Author)