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Theses

La sédimentation fine sur une plate-forme interne actuelle macrotidale : la Baie de Seine sud-orientale (France)

Abstract : The fine sedimentation in the south-eastern Bay of the Seine (shoreface-to-inner shelf) is studied at different time-scales: from the Holocene clayey continental deposits (9000 years BP) to the present-day instantaneous event deposits linked to "estuarine floods". During these events, which follow prolonged weak river flows, the estuarine fine sediment stock and the SPM river-born material are mixed. Thus, veneers of fresh mud occur in this subtidal, opened sandy area. The sea-floor is commonly an erosional surface and relict clays crop out; a lithochronostratigraphical reconstruction of these holocene deposits is proposed. While at a multi-decade and -annual time-scale, silting of the sandy sediments has increased, on a seasonal time-scale, the sea-floor is affected by fine-grained sedimentation events; fresh muds are then reworked through processes which include waves and strong tidal currents.
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https://tel.archives-ouvertes.fr/tel-00003489
Contributor : Sébastien Garnaud <>
Submitted on : Monday, January 19, 2004 - 8:52:20 PM
Last modification on : Monday, April 27, 2020 - 4:26:29 PM

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  • HAL Id : tel-00003489, version 2

Citation

S. Garnaud. La sédimentation fine sur une plate-forme interne actuelle macrotidale : la Baie de Seine sud-orientale (France). Océan, Atmosphère. Université de Caen, 2003. Français. ⟨NNT : 2003CAEN2009⟩. ⟨tel-00003489v2⟩

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