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| Titel |
Dye tracing to determine flow properties of hydrocarbon-polluted Rabots glaciär, Kebnekaise, Sweden |
| VerfasserIn |
C. C. Clason, C. Coch, J. Jarsjö, K. Brugger, P. Jansson, G. Rosqvist |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 19, no. 6 ; Nr. 19, no. 6 (2015-06-15), S.2701-2715 |
| Datensatznummer |
250120737
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| Publikation (Nr.) |
 copernicus.org/hess-19-2701-2015.pdf |
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| Zusammenfassung |
| Over 11 000 L of kerosene was deposited on the surface of Rabots
glaciär on the Kebnekaise Massif, northern Sweden, following the crash of
a Royal Norwegian Air Force aircraft in March 2012. An environmental
monitoring programme was subsequently commissioned, including a series of dye
tracing experiments during the 2013 melt season, conducted to investigate the
transport of pollutants through the glacier hydrological system. This
experimental set-up provided a basis from which we could gain new insight
into the internal hydrological system of Rabots glaciär. Results of dye
tracing experiments reveal a degree of homogeneity in the topology of the
drainage system throughout July and August, with an increase in efficiency as
the season progresses, as reflected by decreasing temporary storage and
dispersivity. Early onset of melting likely led to formation of an efficient,
discrete drainage system early in the melt season, subject to decreasing
sinuosity and braiding as the season progressed. Four distinct meltwater flow
regimes are identified to summarize the temporal and spatial evolution of the
system. Analysis of turbidity-discharge hysteresis further supports the
formation of discrete, efficient drainage, with clockwise diurnal hysteresis
suggesting easy mobilization of readily available sediments in channels. Dye
injection immediately downstream of the pollution source zone reveals
prolonged storage of dye followed by fast, efficient release. Twinned with a
low dye recovery, and supported by sporadic detection of hydrocarbons in the
proglacial river, we suggest that meltwater, and thus pollutants in solution,
may be released periodically through an efficient, and likely pressurized,
hydrological system within the upper reaches of the glacier. |
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