Abstract
A glaciological field programme was carried out from 24 July to 21 August 1988 on the Greenland ice-sheet margin at Pakitsoq, north-east of Ilulissat/Jakobshavn, West Greenland. Glaciological investigations for planning hydropower at Pakitsoq have been made by GGU since 1982. The investigations include six years of mass-balance measurements, repeated photogrammetric and satellite mapping, ice-thickness mapping by radio-echo sounding, stable-isotope studies, hot-water-jet drillings and measurements of ice velocity and englacial temperatures (Thomsen, 1986, 1988; Thorning & Hansen, 1987; Olesen & Clausen, 1988). Simulations of runoff, glacier dynamics and glacier hydraulics are also carried out (Reeh, 1983; Thomsen et al., 1988). The aim of the 1988 field programme was to extend and confirm assumptions in the previous work.
Highlights
A glaciological field programme was carried out from 24 July to 21 August 1988 on the Greenland ice-sheet margin at Pakitsoq, north-east of Ilulissat/Jakobshavn, West Greenland
The field programme consisted of a number of separate out integrated projects by the individual teams which were coordinated by GGU
All external groups were self-financing except the team from the University of Bern who worked for GGU under contract
Summary
Sudden drops ot \Vater level were observed in the dril holes during driIling, indicating the existence of voids or englacial conduits. At one drill site the \Vater level was standing at the ice surfaee when the dril! In order to prevent treezi ng of [he holes and lO record piezometric water pressure over an extended period of time, the holes were drilled close to small surfaee streams which were led artiricially to the holes. Attempts to enlarge the holes \Vith different reamers were difficult and improvements are needed. The few readings in the holes indicate a high water pressure in agreement with the modelling by Thomsen et al (1988) but it should be stressed that difficulties exist in interpreting the recordings, and further work is needed for conclusive statements
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