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| Titel |
Fingerprinting of bed sediment in the Tay Estuary, Scotland: an environmental magnetism approach |
| VerfasserIn |
P. A. Jenkins, R. W. Duck, J. S. Rowan, J. Walden |
| 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 ; 6, no. 6 ; Nr. 6, no. 6, S.1007-1016 |
| Datensatznummer |
250003858
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| Publikation (Nr.) |
 copernicus.org/hess-6-1007-2002.pdf |
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| Zusammenfassung |
| Sediment fingerprinting is
commonly used for sediment provenance studies in lakes, rivers and reservoirs
and on hillslopes and floodplains. This investigation
explores the mixing of terrestrial and marine-derived sediment in the Tay
Estuary, Scotland, using mineral magnetic attributes for
fingerprinting. Samples representative of the estuary sediments and of four
sources (end-members) were subjected to a suite of magnetic
susceptibility and remanence measurements. Sediment samples from the beds of the
Rivers Tay and Earn represented fluvial inputs while
samples from the Angus and Fife coasts represented marine input. Multivariate
discriminant and factor analysis showed that the sources
could be separated on the basis of six magnetic parameters in a simple
multivariate unmixing model to identify source contributions to
estuarine bed sediments. Multi-domain magnetite signatures, characteristic of
unweathered bedrock, dominate the magnetic measurements. Overall
contributions of 3% from the River Earn, 17% from the River Tay, 29% from the
Angus coast and 51% from the Fife coast source end-members,
demonstrated the present-day regime of marine sediment derivation in the Tay
Estuary. However, this conceals considerable spatial
variability both along-estuary and in terms of sub-environments, with
small-scale variations in sediment provenance reflecting local morphology,
particularly areas of channel convergence.
Keywords: bed sediment, environmental magnetism,
fingerprinting, Tay Estuary, Scotland |
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