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|Title:||Airborne resistivity mapping of permafrost near Fairbanks, Alaska|
|Authors:||United States. Army. Corps of Engineers. Alaska District.|
Hoekstra, P. (Pieter)
Sellmann, P. V. (Paul V.)
Delaney, Allan J.
|Publisher:||Cold Regions Research and Engineering Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Research report (Cold Regions Research and Engineering Laboratory (U.S.)) ; 324.|
Abstract: Airborne resistivity methods using radio waves in three frequency bands were tested in the vicinity of Fairbanks, Alaska. The test sites were selected because much ground control is available for this area. The objectives of this study were to determine the ability of these methods to map permafrost and other soils and to investigate the advantages of multifrequency mapping. Investigations in permafrost regions for such geotechnical endeavors as route selection for roads and pipelines and site investigation for building and dam construction often require that a careful assessment be made of the presence or absence of frozen ground, of the ice content of frozen ground, and of the depth of frozen ground. The airborne resistivity data obtained in this study were contoured and the contour maps were compared with surficial geological maps and other ground truth data available. The following conclusions were reached: 1) in areas where the near surface sediments are relatively uniform; VLF resistivity best delineates permafrost; and 2) in areas where surface sediments vary widely (e..g., recent flood plains), resistivity at all frequencies gives little information on permafrost conditions, but provides other important information, such as bedrock type, depth to bedrock, soil type and layering.
|Appears in Collections:||CRREL Research Report|
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