Some evidences of northward fine sediment transport in the northern portuguese continental shelf |
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| Institution: | 1. Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. Department of Earth Sciences, Faculty of Geosciences, Utrecht University, Heidelberglaan 2, 3584 CS Utrecht, The Netherlands;2. Institute of Earth Sciences, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 234, 69120 Heidelberg, Germany;3. Royal Netherlands Institute for Sea Research (NIOZ), P.O. Box 59, AB Den Burg, 1790 Texel, The Netherlands;1. ISMAR (Institute of Marine Sciences), CNR, Bologna, Italy;2. Istanbul Technical University, Department of Geological Engineering, Istanbul, Turkey;3. Dipartimento di Scienze Biologiche, Geologiche e Ambientali, University of Bologna, Italy;4. Dipartimento di Fisica e Scienze della Terra “Macedonio Melloni”, University of Parma, Italy |
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| Abstract: | On the basis of sedimentological and oceanographical data, a transport scheme for fine-grained material is proposed in order to explain the location of a muddy deposit present in the northern Portuguese continental shelf, north-west off the Douro River mouth. This mid-shelf deposit is recent, active and its main source is apparently the Douro River. The sediment supply can be related with the oceanographic conditions in winter regime, characterised by a poleward along-shelf current with a bottom westward component, as a consequence of a south-west wind. The resulting fine sediment transport, essentially made in the bottom nepheloid layer, is believed to have a north-west direction. |
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