Evolution of secondary cellular circulation flow above submarine bedforms imaged by remote sensing techniques.

Hennings, Ingo and Herbers, Dagmar (2013) Evolution of secondary cellular circulation flow above submarine bedforms imaged by remote sensing techniques. In: MARID 2013, Fourth International Conference on Marine and River Dune Dynamics, Bruges, Belgium, 15-17 April 2013. , ed. by Van Lancker, V. and Garlan, T.. VLIZ Special Publication, 65 . Flanders Marine Institute (VLIZ), Oostende, Belgium, pp. 131-138. ISBN 978-2-11-128352-7

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Abstract

Normalized radar cross section (NRCS) modulation and acoustic Doppler current profiler (ADCP) measurements above submarine sand ribbons and sand waves are presented. The two study areas are located in the Southern Bight of the North Sea at the Birkenfels wreck and in the sand wave field of the Lister Tief in the German Bight of the North Sea. These measurements reveal the developments of secondary cellular circulations in tidally induced coastal sea areas. Secondary circulation cells can develop perpendicular as well as parallel to the direction of the dominant tidal current flow. Circulation cells developed perpendicular to the direction of the dominant tidal current flow are associated with marine sand ribbons manifested near an underwater wreck. Secondary circulation cells within the water column observed parallel to the direction of the dominant tidal current flow have been initiated during flood and ebb tidal current phases associated with submarine sand waves. These two types of cellular circulations must obey the Hamiltonian principle of classical mechanics. The current–short surface wave interaction is described by the action balance or radiation balance-equation based on weak hydrodynamic interaction theory. The calculated current gradient or strain rate of the applied imaging theory has the same order of magnitude for both bedforms such as marine sand ribbons and sand waves, respectively.

Document Type: Book chapter
Keywords: radiation balance equation, secondary cellular circulation flow, up- and down welling, sand ribbon, sand wave
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Date Deposited: 27 Jun 2013 09:53
Last Modified: 27 Jun 2013 09:53
URI: http://oceanrep.geomar.de/id/eprint/21478

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