A Ground-Penetrating Radar Study of Active Layer Thicknesses in Areas of Moist Sedge and Wet Sedge Tundra near Bethel, Alaska, U.S.A.

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Abstract
Ground-penetrating radar (GPR) techniques were used near Bethel, Alaska, to compare the thickness of the active layer between areas of most sedge and wet sedge tundra. Once set up in the field, the GPR provided a rapid, accurate, and effective means for determining the depth to frozen soil and the thickness of the active layer. In areas of silty soil, the average thickness of the active layer under wet sedge tundra (64 cm) was considerably deeper than under moist sedge tundra (38 cm). In areas of moist sedge tundra underlain by silty soils, depths to frozen soil layers were relatively shallow with active layer thicknesses ranging from 17 to 63 cm.

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