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| Titel |
The beneficial role of rubble mound coastal structures on seawater oxygenation |
| VerfasserIn |
E. I. Daniil, V. K. Tsoukala, C. I. Moutzouris |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 18, no. 10 ; Nr. 18, no. 10, S.1360-1371 |
| Datensatznummer |
250014085
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| Publikation (Nr.) |
 copernicus.org/angeo-18-1360-2000.pdf |
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| Zusammenfassung |
The beneficial role of rubble mound coastal
structures on oxygenation under the effect of waves is discussed, based on
analytical considerations and experimental data from laboratory experiments with
permeable and impermeable structures. Significant oxygenation of the
wave-protected area was observed as a result of horizontal transport through the
permeable structure. A two-cell model describing the transport of dissolved
oxygen (DO) near a rubble mound breakwater structure was developed and used for
the determination of the oxygen transfer coefficients from the experimental
data. Oxygen transfer through the air–water interface is considered a source
term in the transport equation and the oxygen flux through the structure is
taken into account. The mass transport equations for both sides of the structure
are solved analytically in terms of time evolution of DO concentration. The
behaviour of the solution is illustrated for three different characteristic
cases of initial conditions. The oxygen transfer through the air-water interface
in the wave-influenced area increases the DO content in the area; the resulting
oxygen flux through the structure is discussed. The analytical results depend on
the initial conditions, the oxygen transfer coefficient and the exchange flow
rate through the structure. Experiments with impermeable structures show that
air water oxygen transfer in the harbour area is negligible in the absence of
waves. In addition the ratio of the horizontal DO flux to the vertical flux into
the seaward side tends towards a constant value, independent of the initial
conditions.
Key words: Oceanography: physical (air-sea
interactions; surface waves and tides) |
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