Filters
Results 1 - 1 of 1
Results 1 - 1 of 1.
Search took: 0.019 seconds
AbstractAbstract
[en] To advance the understanding of processes associated with glaciation and their impact on the long-term performance of a deep geological repository, the Greenland Analogue Project (GAP), a four-year field and modelling study of the Greenland ice sheet and sub-surface conditions, has been initiated collaboratively by SKB, Posiva and NWMO. The study site encompasses a land terminus portion of the Greenland ice sheet east of Kangerlussuaq and is in many ways considered to be an appropriate analogue of the conditions that are expected to prevail in much of Canada and Fennoscandia during future glacial cycles. The project is planned to run from 2009 until 2012. The GAP will conduct the first in situ investigations of some of the parameters and processes needed to achieve a realistic understanding of how an ice sheet may impact a deep repository, and will provide measurements, observations and data that may significantly improve our safety assessments and risk analyses of glaciation scenarios. The project includes three sub-projects (A-C) with specific individual objectives, which collectively aim at contributing knowledge and input to the overall project aim. Three field campaigns were carried out in SPA during 2009. These campaigns focused on: (1) deployment and maintenance of AWS and GPS stations and to test the deep-look radar equipment; (2) investigating the hydrological processes and feedbacks and testing of passive seismic equipment; (3) downloading of weather station data and GPS data and winterizing the equipment. An extensive archive of real-time satellite remote sensing datasets has been obtained to be able to better constraint the surface elevation and dynamics of basal hydrological mechanisms. From this archive it has been possible to obtain Russell Glacier Cachment (RGC)-wide constraints on annual, seasonal and specific temporal snapshots of surface speed, initial lake and moulin distribution, drainage and network connections along with the temporal-development and drainage characteristics of supraglacial lakes. SPB aims at making in situ measurements of the sub glacial hydrological conditions of the Greenland Ice Sheet and to conduct numerical modelling experiments focused on ice-sheet and basal conditions. SPB has focused on preparing for the hot water ice drilling that will commence in 2010. For this purpose a field reconnaissance of the ice drilling sites was carried out in the spring of 2009, during which ice penetrating radar data was also collected. Measured ice depths range from 100 to 190 metres and the ice depth generally displayed an increase with distance from the margin. SPB aims at drilling as close as possible to the ice margin during 2010 so that the ice boreholes intersect the bed above the bedrock borehole to be drilled by SPC in 2011. From the radar campaign carried out by SPB in May, 2009, it is suggested that the ice is wet based in the area of planned ice drilling. During the reconnaissance SPB also discovered that due to the ice surface topography in the near margin area the ice drilling operations will be slow. The main aim of the SPC during 2009 was to collect a suite of information supporting the planning of the deep drilling to be carried out in 2011 including groundwater information. SPC drilled two cored boreholes with hot water drilling in 2009 with the aim of: (1) obtaining knowledge about the permafrost conditions close to the ice margin; (2) demonstrating the presence of a talik under a lake; (3) collecting core material for geological and fracture studies; and (4) providing groundwater sampling and hydraulic testing opportunities. (orig.)
Primary Subject
Secondary Subject
Source
Aug 2011; 121 p; Also available in fulltext at www.posiva.fi or as a soft back edition from Posiva; 33 refs.
Record Type
Report
Report Number
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue