Abstract
Geophysical methods are among the best tools available to delineate discontinuous permafrost and to help determine and map its physical properties. In this paper, case histories in various types of Quaternary sediments are used to illustrate applications of geophysical methods. The study sites are in the Kangiqsualujjuaq area, on the southeastern shore of Ungava Bay, northern Quebec. Mean annual air temperature is about -5.7°C and, depending on site conditions, long-term mean permafrost temperatures vary between -0.15° and -2.0°C The surface geophysical methods used are: electrical resistivity soundings with Schlumberger configuration, electrical resistivity and induced polarization profiling with dipole-dipole arrays, and electromagnetic two-configuration, multi-frequency, multi-separation soundings. The use of these techniques on a single site allowed discrimination among anomalies between taliks and texture changes. Good interpretations of active-layer and permafrost thicknesses are obtained. Downhole ...
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