High resolution seafloor images in the Gulf of Cadiz, Iberian margin |
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| Authors: | V Hanquiez T Mulder E Gonthier M Voisset |
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| Institution: | a Université Bordeaux 1, CNRS, UMR 5805-EPOC, avenue des facultés Talence, F-33405 France
b IFREMER, Département Géosciences Marines, BP 70, Plouzané, F-29280 France |
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| Abstract: | In the Gulf of Cadiz, the hydrodynamic process acting on particle transport and deposition is a strong density-driven bottom current caused by the outflow of the saline deep Mediterranean water at the Strait of Gibraltar: the Mediterranean Outflow Water (MOW). New high resolution acoustic data including EM300 multibeam echo-sounder, deep-towed acoustic system SAR and very high resolution seismic, completed by piston cores collected during the CADISAR cruise allow to improve the understanding of the hydrodynamics of the MOW in the eastern part of the Gulf of Cadiz. Interpretation of data corrects the previous model established in this area and allows, for the first time, the accurate characterization of various bedforms and erosive structures along the MOW pathway and the precise identification of numerous gravity instabilities. The interaction between the MOW, the seafloor morphology and the Coriolis force is presently the driving force of the sedimentary distribution pattern observed on the Gulf of Cadiz continental slope. |
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| Keywords: | Gulf of Cadiz Mediterranean Outflow Water (MOW) Contourites deep-towed SAR acoustic facies sedimentary processes instabilities |
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