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Abstract
Ground-penetrating radar (GPR) and computer processing and graphic techniques were used to construct cross-sectional profiles and two-dimensional contour plots of two palsas near Schefferville, Quebec, Canada. Grids of varying sizes were established across a portion of Goodream palsa-fen which contained two palsas, and the areas was systematically sampled with GPR. Data from the radar profiles were computer processed and used to construct cross sections of the palsa mounds and fen. This procedure provided a quick and effective means for determining the thickness of the active layer, for characterizing the extent and depth to permafrost, and for charting the stratigraphic layers within the palsa fen. Compared with traditional methods for characterizing the internal structure and features of palsa, GPR and computer processing are many times faster, less labor intense, and less likely to overlook subsurface features or anomalies.