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| Titel |
Modelled transport of benthic marine microplastic pollution in the Nazaré Canyon |
| VerfasserIn |
A. Ballent, S. Pando, A. Purser, M. F. Juliano, L. Thomsen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 12 ; Nr. 10, no. 12 (2013-12-06), S.7957-7970 |
| Datensatznummer |
250085460
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| Publikation (Nr.) |
 copernicus.org/bg-10-7957-2013.pdf |
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| Zusammenfassung |
With knowledge of typical hydrodynamic behavior of waste plastic material,
models predicting the dispersal of benthic plastics from land sources within
the ocean are possible. Here we investigated the hydrodynamic behavior
(density, settling velocity and resuspension characteristics) of non-buoyant
preproduction plastic pellets in the laboratory. From these results we used
the MOHID modelling system to predict what would be the likely transport and
deposition pathways of such material in the Nazaré Canyon (Portugal)
during the spring/summer months of 2009 and the autumn/winter months of
2011.
Model outputs indicated that non-buoyant plastic pellets would likely be
transported up and down canyon as a function of tidal forces, with only a
minor net down canyon movement resulting from tidal action. The model
indicated that transport down canyon was likely greater during the
autumn/winter, primarily as a result of occasional mass transport events
related to storm activity and internal wave action. Transport rates within
the canyon were not predicted to be regular throughout the canyon system,
with stretches of the upper canyon acting more as locations of pellet
deposition than conduits of pellet transport. Topography and the depths of
internal wave action are hypothesized to contribute to this lack of
homogeneity in predicted transport. |
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