Inversion of borehole-response test data for estimation of subglacial hydraulic properties
Abstract Response tests are widely used in ground-water studies to assess the hydraulic properties of sub-surface water-flow systems. The simplicity of such tests also makes them attractive for investigation of subglacial hydraulic conditions. This paper describes a systematic, quantitative approach...
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Cambridge University Press (CUP)
1997
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Online Access: | http://dx.doi.org/10.1017/s0022143000002860 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000002860 |
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crcambridgeupr:10.1017/s0022143000002860 2024-03-03T08:44:41+00:00 Inversion of borehole-response test data for estimation of subglacial hydraulic properties Stone, Dan B. Clarke, Garry K. C. Еllis, Robert G. 1997 http://dx.doi.org/10.1017/s0022143000002860 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000002860 en eng Cambridge University Press (CUP) Journal of Glaciology volume 43, issue 143, page 103-113 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1997 crcambridgeupr https://doi.org/10.1017/s0022143000002860 2024-02-08T08:34:04Z Abstract Response tests are widely used in ground-water studies to assess the hydraulic properties of sub-surface water-flow systems. The simplicity of such tests also makes them attractive for investigation of subglacial hydraulic conditions. This paper describes a systematic, quantitative approach to the analysis of borehole-response test data. The approach uses the theoretical model of Stone and Clarke (1993), which describes water motion in a coupled borehole—subglacial flow system; this framework provides the basis for an inversion scheme that is focused on quantifying physical properties of the basal-flow system, as it is characterized in the theoretical model. The inversion procedure was applied to response-test data from Trapridge Glacier, Yukon Territory, Canada. Results of the inversions suggest that the subglacial drainage network can be described as a confined layer comprising coarse-sand-to fine-gravel-sized sediments, having a thickness of 0.1 – 0.3 m, and a hydraulic conductivity of about 5 × 10 −4 ms −1 . Based on the water-drainage rates from boreholes, as they connect with the subglacial water-flow system, specific storage of the sediment layer was estimated to be approximately 1 × 10 −4 m −1 . Further consideration of subglacial water-flow conditions suggests that connection drainage test results may tend to underestimate specific storage of the overall glacier substrate. Article in Journal/Newspaper glacier* Journal of Glaciology Yukon Cambridge University Press Yukon Canada Trapridge Glacier ENVELOPE(-140.337,-140.337,61.233,61.233) Journal of Glaciology 43 143 103 113 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Stone, Dan B. Clarke, Garry K. C. Еllis, Robert G. Inversion of borehole-response test data for estimation of subglacial hydraulic properties |
topic_facet |
Earth-Surface Processes |
description |
Abstract Response tests are widely used in ground-water studies to assess the hydraulic properties of sub-surface water-flow systems. The simplicity of such tests also makes them attractive for investigation of subglacial hydraulic conditions. This paper describes a systematic, quantitative approach to the analysis of borehole-response test data. The approach uses the theoretical model of Stone and Clarke (1993), which describes water motion in a coupled borehole—subglacial flow system; this framework provides the basis for an inversion scheme that is focused on quantifying physical properties of the basal-flow system, as it is characterized in the theoretical model. The inversion procedure was applied to response-test data from Trapridge Glacier, Yukon Territory, Canada. Results of the inversions suggest that the subglacial drainage network can be described as a confined layer comprising coarse-sand-to fine-gravel-sized sediments, having a thickness of 0.1 – 0.3 m, and a hydraulic conductivity of about 5 × 10 −4 ms −1 . Based on the water-drainage rates from boreholes, as they connect with the subglacial water-flow system, specific storage of the sediment layer was estimated to be approximately 1 × 10 −4 m −1 . Further consideration of subglacial water-flow conditions suggests that connection drainage test results may tend to underestimate specific storage of the overall glacier substrate. |
format |
Article in Journal/Newspaper |
author |
Stone, Dan B. Clarke, Garry K. C. Еllis, Robert G. |
author_facet |
Stone, Dan B. Clarke, Garry K. C. Еllis, Robert G. |
author_sort |
Stone, Dan B. |
title |
Inversion of borehole-response test data for estimation of subglacial hydraulic properties |
title_short |
Inversion of borehole-response test data for estimation of subglacial hydraulic properties |
title_full |
Inversion of borehole-response test data for estimation of subglacial hydraulic properties |
title_fullStr |
Inversion of borehole-response test data for estimation of subglacial hydraulic properties |
title_full_unstemmed |
Inversion of borehole-response test data for estimation of subglacial hydraulic properties |
title_sort |
inversion of borehole-response test data for estimation of subglacial hydraulic properties |
publisher |
Cambridge University Press (CUP) |
publishDate |
1997 |
url |
http://dx.doi.org/10.1017/s0022143000002860 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000002860 |
long_lat |
ENVELOPE(-140.337,-140.337,61.233,61.233) |
geographic |
Yukon Canada Trapridge Glacier |
geographic_facet |
Yukon Canada Trapridge Glacier |
genre |
glacier* Journal of Glaciology Yukon |
genre_facet |
glacier* Journal of Glaciology Yukon |
op_source |
Journal of Glaciology volume 43, issue 143, page 103-113 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000002860 |
container_title |
Journal of Glaciology |
container_volume |
43 |
container_issue |
143 |
container_start_page |
103 |
op_container_end_page |
113 |
_version_ |
1792500166739099648 |