Sampling-rate effects on the properties of dye breakthrough curves from glaciers
Abstract Dye-tracer techniques are widely used in infer the character of subglacial drainage systems. Quantitative analysis of dye breakthrough curves focuses on the determination of the water through flow velocity (u), the dispersion coefficient (D) and the dispersivity parameter (d = D/u) . Togeth...
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Cambridge University Press (CUP)
1996
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Online Access: | http://dx.doi.org/10.1017/s0022143000030641 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000030641 |
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crcambridgeupr:10.1017/s0022143000030641 2024-03-03T08:46:03+00:00 Sampling-rate effects on the properties of dye breakthrough curves from glaciers Nienow, Peter W. Sharp, Martin Willis, Ian С. 1996 http://dx.doi.org/10.1017/s0022143000030641 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000030641 en eng Cambridge University Press (CUP) Journal of Glaciology volume 42, issue 140, page 184-189 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1996 crcambridgeupr https://doi.org/10.1017/s0022143000030641 2024-02-08T08:41:37Z Abstract Dye-tracer techniques are widely used in infer the character of subglacial drainage systems. Quantitative analysis of dye breakthrough curves focuses on the determination of the water through flow velocity (u), the dispersion coefficient (D) and the dispersivity parameter (d = D/u) . Together, these parameters describe the rate of passage of tracer through the drainage system and the extent to which the dye cloud becomes spread out during passage. They have been used to infer the nature of flow conditions within a drainage system and temporal changes in system morphology. Estimates of all three parameters, however, are dependent upon the sampling interval at which measurements of dye concentration used to define breakthrough curves are made. For a given breakthrough curve, the dispersion coefficient increases with the sampling interval, while the through flow velocity shows no systematic variation. As a result, the dispersivity also tends to increase with the sampling interval. Investigations of the sensitivity of parameter estimates to the sampling interval reveal that reliable estimates can be obtained only if the sampling interval is less than 1/16 of the time from dye injection to peak dye concentration. As a general guide, we Suggest that, ideally, quantitative analyses of dye breakthrough curves should therefore be conducted only when this criterion can be met. Article in Journal/Newspaper Journal of Glaciology Cambridge University Press Journal of Glaciology 42 140 184 189 |
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Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Nienow, Peter W. Sharp, Martin Willis, Ian С. Sampling-rate effects on the properties of dye breakthrough curves from glaciers |
topic_facet |
Earth-Surface Processes |
description |
Abstract Dye-tracer techniques are widely used in infer the character of subglacial drainage systems. Quantitative analysis of dye breakthrough curves focuses on the determination of the water through flow velocity (u), the dispersion coefficient (D) and the dispersivity parameter (d = D/u) . Together, these parameters describe the rate of passage of tracer through the drainage system and the extent to which the dye cloud becomes spread out during passage. They have been used to infer the nature of flow conditions within a drainage system and temporal changes in system morphology. Estimates of all three parameters, however, are dependent upon the sampling interval at which measurements of dye concentration used to define breakthrough curves are made. For a given breakthrough curve, the dispersion coefficient increases with the sampling interval, while the through flow velocity shows no systematic variation. As a result, the dispersivity also tends to increase with the sampling interval. Investigations of the sensitivity of parameter estimates to the sampling interval reveal that reliable estimates can be obtained only if the sampling interval is less than 1/16 of the time from dye injection to peak dye concentration. As a general guide, we Suggest that, ideally, quantitative analyses of dye breakthrough curves should therefore be conducted only when this criterion can be met. |
format |
Article in Journal/Newspaper |
author |
Nienow, Peter W. Sharp, Martin Willis, Ian С. |
author_facet |
Nienow, Peter W. Sharp, Martin Willis, Ian С. |
author_sort |
Nienow, Peter W. |
title |
Sampling-rate effects on the properties of dye breakthrough curves from glaciers |
title_short |
Sampling-rate effects on the properties of dye breakthrough curves from glaciers |
title_full |
Sampling-rate effects on the properties of dye breakthrough curves from glaciers |
title_fullStr |
Sampling-rate effects on the properties of dye breakthrough curves from glaciers |
title_full_unstemmed |
Sampling-rate effects on the properties of dye breakthrough curves from glaciers |
title_sort |
sampling-rate effects on the properties of dye breakthrough curves from glaciers |
publisher |
Cambridge University Press (CUP) |
publishDate |
1996 |
url |
http://dx.doi.org/10.1017/s0022143000030641 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000030641 |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology volume 42, issue 140, page 184-189 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000030641 |
container_title |
Journal of Glaciology |
container_volume |
42 |
container_issue |
140 |
container_start_page |
184 |
op_container_end_page |
189 |
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1792501897651814400 |