Abstract
The first successful application of electromagnetic ref1ection (EMR) techniques for determination of ice thickness in the outermost margin of the Inland Ice adjacent to the Pâkitsoq basin took place in luly 1985 (Thorning et al., 1986). Although the survey was planned as a series of experiments to examine why previous attempts had not worked, the EMR data acquired were of very good quality and could be compiled into a preliminary map of ice thickness and a map of the subglacial topography over part of the region. Thus, by early 1986 it Rapp. Grønlands geol. Unders. 135, 87-95 (1987) was known that the method worked and could be compiled through to the final product. With the increasing interest in this region, which is the planned location of the first hydroelectric power plant in Greenland, it was necessary to return in 1986 to survey the area in greater detail and to extend the coverage to the east. This note describes the field work carried out in April 1986 and the subsequent compilation and analysis of the combined EMR data sets from 1985 and 1986.
Highlights
Grønlands Tekniske Organisation (GTO) paid the cost of the participation of Bo Madsen (GTO) who took care of the deployment of four remote stations and calculated the preliminary positions in the field and later the final UTM coordinates from navigational data recorded on tape during flights
The data were gridded using the same method and same grid dimensions as for the ice thickness data. Using another GGU program (GRIDOP) the two data sets were combined on a grid level to produce a grid of the subglacial relief
A mono-pulse radar is under construction by GGU following Hodge (1978) and will be completed in the spring of 1987. This will be used for follow-up work on the Inland Ice and the glaciers where no signals could be obtained with airborne equipment
Summary
The first successful application of electromagnetic ref1ection (EMR) techniques for determination of ice thickness in the outermost margin of the Inland Ice adjacent to the Påkitsoq basin took place in luly 1985 (Thorning et al, 1986). GTO paid the cost of the participation of Bo Madsen (GTO) who took care of the deployment of four remote stations and calculated the preliminary positions in the field and later the final UTM coordinates from navigational data recorded on tape during flights This made it possibie to operate further away from the margin of the Inland Ice. The system could not give ihflight information to the pilot, and signals from the remote stations were not always received because of the very low flight altitude of 10 m over the ice surface, but accurate positions were subsequently calculated for more than 80% of the data, and the positions of the remaining data could be interpolated with a fairly high degree of accuracy.
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