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Archives sédimentaires : à la recherche de nouveaux sites de carottage pour reconstruire l'histoire de la contamination de la Seine

Abstract : In the framework of the action "Sedimentary archives: reconstructing the temporal trajectories of contaminants", we proceeded in 2020, (1) to the search of a suitable site for the conservation of sedimentary archives in upper catchment parts and, (2) in lower parts, to the identification of a new coring site in the Bouafles area (disturbed by recent ploughing, as shown in this report). On the basis of a cartographic work (historical maps to document the modifications of the morphology of the river, current maps to locate the flooding zones, photographs allowing to reconstruct modifications and floods, interviews of the local inhabitants, ...), three field campaigns allowed to explore two collection sites identified as suitable for the deposition and conservation of these archives. The first site is located upstream of the Parisian metropolis. It should make it possible to reconstruct the contribution of the upper parts of the catchment to the historical contamination of the Seine River. The second site explored in the downstream zone of the basin may provide an alternative to the Bouafles site where the land was recently ploughed. The sediment was then prepared to be analysed by gamma spectrometry (for dating with Cs-137 and excess Pb-210 activities) to check the potential to date these archives and, if so, to determine to corresponding time window. The first observations show layered sedimentation and slow sedimentary filling, potentially having recorded contamination for most of the 20th century. However, these cores should also be used to search for more recent contamination sources such as microplastics and emerging pollutants.
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https://hal-cea.archives-ouvertes.fr/cea-03029687
Contributor : Olivier Evrard <>
Submitted on : Saturday, November 28, 2020 - 7:06:12 PM
Last modification on : Tuesday, December 8, 2020 - 3:39:22 AM

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  • HAL Id : cea-03029687, version 1

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Sophie Ayrault, Olivier Evrard, Anthony Foucher, Irène Lefèvre, Elie Dhivert, et al.. Archives sédimentaires : à la recherche de nouveaux sites de carottage pour reconstruire l'histoire de la contamination de la Seine. [Rapport de recherche] Piren-Seine. 2020. ⟨cea-03029687⟩

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