Electrical Ground Impedance Measurements in Alaskan Permafrost Regions.

The objective of the work described in the report is to establish the techniques leading to construction of an electrical conductivity map of Alaska in the V/L/MF frequency band for use in planning of navigational aids. Several difficulties were encountered in using ground conductivity data of high...

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Bibliographic Details
Main Author: Hoekstra,Pieter
Other Authors: COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H
Format: Text
Language:English
Published: 1975
Subjects:
Snow
Ice and Permafrost
Radiofrequency Wave Propagation
*ELECTROMAGNETIC WAVE PROPAGATION
*GROUND WAVES(ELECTROMAGNETIC)
*PERMAFROST
GROUND LEVEL
MEASUREMENT
CONDUCTIVITY
ALASKA
ELECTRICAL CONDUCTIVITY
ATTENUATION
LOW FREQUENCY
ARCTIC REGIONS
VERY LOW FREQUENCY
MEDIUM FREQUENCY
DOT/4GZ/GB
Frozen soils
Arctic
Ice
permafrost
Alaska
Online Access:http://www.dtic.mil/docs/citations/ADA011458
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA011458
Description
Summary:The objective of the work described in the report is to establish the techniques leading to construction of an electrical conductivity map of Alaska in the V/L/MF frequency band for use in planning of navigational aids. Several difficulties were encountered in using ground conductivity data of high quality to construct a conductivity map of Alaska. They are: (a) The results showed that the ground conductivity in permafrost areas of North America is very heterogeneous, so that it is not directly apparent how to assign an effective conductivity value to a path of practical length (about 100 km); and, (b) The geological and permafrost conditions very much in Alaska, so that measurements at a location are representative of a small area only, leaving large areas of Alaska open to question. Theoretical evaluations of the seasonal changes in ground conductivity and their effect on radiowave propagation and electrical grounding are also discussed.

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