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| Titel |
Turbulence producing processes in a tidal channel |
| VerfasserIn |
Anne-Christin Schulz, Thomas H. Badewien, Oliver Zielinski |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250081924
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| Zusammenfassung |
| Turbulence is important for mixing processes in the ocean. Especially in shallow water
regions with high current velocities, e.g. in a tidal channel, vertical mixing is strong. The
origin and continuity of turbulence depends strongly from Reynolds Stress Ï and velocity
shear S.
In the work presented, the Reynolds Stress Ï and the velocity shear S were estimated using
current measurements from a bottom-mounted high-frequency Acoustic Doppler Current
Profiler (ADCP). The measurement was conducted at a Time Series Station in an East Frisian
tidal channel in the southern North Sea. Data were collected during one tidal period in
November 2010.
The comparison between the Reynolds Stress Ï and the velocity shear S reveals a period,
which is related to the quarter-diurnal pattern M4. The maximum values are located near the
seabed. Therefore, turbulence is generated by sheared currents at the bottom of the sea. Thus,
shear acts to increase turbulent mixing. Due to the shallow water depth mixing occurs across
the entire water column. |
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