First results of the OROMA experiment in the Lister Tief of the German Bight in the North Sea, EARSeL Proceedings

Hennings, Ingo, Herbers, Dagmar, Prinz, K. and Ziemer, F. (2004) First results of the OROMA experiment in the Lister Tief of the German Bight in the North Sea, EARSeL Proceedings EARSeL eProceedings, 3 . pp. 86-104.

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The objective of the project entitled “Operational Radar and Optical Mapping in monitoring hydrodynamic,
morphodynamic and environmental parameters for coastal management (OROMA)”
within the Fifth Framework Programme of the European Commission (EC) is to improve the effectiveness
of monitoring technologies in coastal waters. The Research Vessel (R.V.) Ludwig Prandtl
of the GKSS research centre was equipped with special sensors and instruments to measure the
position of the ship, the water depth, the salinity, the water temperature, the current speed and direction,
the modulation characteristics of short-wave energies, and relevant air-sea interaction parameters
due to the presence of submarine sand waves. The first experiment of the OROMA project
on 5-16 August 2002 took place in the Lister Tief, a tidal inlet of the German Bight in the North
Sea. The seabed morphology of the Lister Tief reveals a complex configuration of different bedforms
which is four-dimensional in space and time. A significant upward orientated component uvert
of the three-dimensional current velocity field was observed. Marked vertically so-called waterspouts
of uvert above the crests of sand waves have been measured by the Acoustic Doppler Current
Profiler (ADCP) as straight lines. They cause water upwelling with turbulence patterns at the
water surface affecting the Normalized Radar Cross Section (NRCS) modulation. A first impression
of expected NRCS modulation signatures of sea bottom topography detected by the GKSS
shipborne X-band radar are presented as an uncalibrated composite of five single sea clutter images
acquired in the Lister Tief on 22 November 1990.

Document Type: Article
Keywords: Geophysics; North Sea; marine sand waves; Acoustic Doppler Current Profiler (ADCP); Normalized Radar Cross Section (NRCS) modulation
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Refereed: No
ISSN: 1729-3782
Date Deposited: 07 Jul 2009 10:53
Last Modified: 06 Jul 2012 14:55

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