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| Titel |
Nearshore circulation revealed by wastewater discharge from a submarine outfall, Aveiro Coast, Portugal |
| VerfasserIn |
J. Figueiredo da Silva, R. W. Duck, T. S. Hopkins, J. M. Anderson |
| 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.983-988 |
| Datensatznummer |
250003855
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| Publikation (Nr.) |
 copernicus.org/hess-6-983-2002.pdf |
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| Zusammenfassung |
| The morphological and
climatic conditions of the Atlantic coast of northern Portugal result in a
prevailing upwelling circulation over the continental
shelf. A submarine outfall releases wastewater into the ocean c. 3 km directly
offshore (at ∼16 m water depth) from S. Jacinto, 5 km to
the north of the inlet to the estuarine coastal lagoon system of the Ria de
Aveiro. The buoyant plume has a distinctive reddish brown colour
and is clearly visible at the water surface. The transport and dispersion of the
plume was monitored by airborne photography and by in situ water
sampling. Results
revealed the surface currents present and water mass fronts in the nearshore
zone of the Aveiro coast. During the spring and summer,
the plume was not transported offshore in the manner expected by the upwelling
shelf circulation. Instead, it was commonly observed to be
transported alongshore with the prevailing southerly circulation or with an
onshore component. The transport to the south caused the
outfall plume to interact with the circulation associated with the tidal
currents generated in the inlet channel to the Ria de Aveiro. The
observations suggest that the trophic status of the Ria de Aveiro is unlikely to
change because of the operation of the submarine outfall. Furthermore,
this study demonstrates how simple observations of wastewater discharge from a
submarine outfall can be used to improve understanding of
nearshore circulation.
Keywords: water circulation, upwelling, ocean outfall,
remote sensing, eutrophication, Ria de Aveiro |
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