Loïc Ducros

Université de Nîmes

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Frédérique Eyrolle

Institut de Radioprotection et de Sûreté Nucléaire

Hugo Lepage

Institut de Radioprotection et de Sûreté Nucléaire

Catherine Cossonnet

Institut de Radioprotection et de Sûreté Nucléaire

Yoann Copard

Université de Rouen Normandie

David Mourier

Institut de Radioprotection et de Sûreté Nucléaire

Christiane Dufresne

Université Laval

Vincent Rey

Institut Méditerranéen d’Océanologie

Franck Giner

Institut de Radioprotection et de Sûreté Nucléaire

Amandine Morereau

Institut de Radioprotection et de Sûreté Nucléaire

Frank Giner

Institut de Radioprotection et de Sûreté Nucléaire

Cooperative Institutions

Institut de Radioprotection et de Sûreté Nucléaire

Milieux environnementaux, transferts et interactions dans les hydrosystèmes et les sols

Centre National de la Recherche Scientifique

CEA Cadarache

Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement

Institut de Recherche pour le Développement

Ifremer

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

Université de Toulon

Aix-Marseille Université

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The unravelling of radiocarbon composition of organic carbon in river sediments to document past anthropogenic impacts on river systems

The Science of The Total Environment (2021)

Yoann Copard Frédérique Eyrolle Cécile Grosbois Hugo Lepage Loïc Ducros

10.1016/j.scitotenv.2021.150890

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Citations (14)

Datasets of solid and liquid discharges of an urban Mediterranean river and its karst springs (Las River, SE France)

Data in Brief (2020)

Christiane Dufresne Bruno Arfib Loïc Ducros C. Duffa Frank Giner

This data paper presents: (1) the liquid and solid discharge characteristics of the Las River, an urban Mediterranean stream flowing to the Bay of Toulon (south of France), and (2) the water height of the main karst springs supplying the Las River. We assessed the river's discharge with hydrological observations and we explored floods characteristics influencing its solid discharge [1]. The location of the monitoring station near the river's mouth was selected accordingly to accessibility and technical constraints, as far downstream as possible. The vast majority of tributaries (such as possible underground springs, stormwater outlets, urban runoff) were taken into account. A multi-parameter probe (temperature, pressure, turbidity and electric conductivity) and a sediment trap were deployed continuously for 17 months, from October 2012 to March 2014. At the river's sources, probes (temperature, water height) were deployed to characterized karst springs. Times series were averaged at a daily time step, and water height converted in discharge when the rating curve was available. Sediment samples were analyzed for grain-size distribution. Datasets may help to estimate karsts' contributions to the Mediterranean Sea and to assess their influence on rivers discharge and solid yield. Stakeholders may also use the maximum water height to evaluate the flooding risk. Our data also contribute to linking the catchment freshwater to the coastal sea, a connection yet to be fully explored.

Turbidity

Discharge

Main river

10.1016/j.dib.2020.106022

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Tritium in river waters from French Mediterranean catchments: Background levels and variability

The Science of The Total Environment (2017)

Loïc Ducros Frédérique Eyrolle Claire Della Vedova Sabine Charmasson Marc Leblanc

Tritiated water

10.1016/j.scitotenv.2017.08.026

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Citations (26)

Karst and urban flood-induced solid discharges in Mediterranean coastal rivers: The case study of Las River (SE France)

Journal of Hydrology (2020)

Christiane Dufresne Bruno Arfib Loïc Ducros C. Duffa Frank Giner

Discharge

10.1016/j.jhydrol.2020.125194

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Evidence for tritium persistence as organically bound forms in river sediments since the past nuclear weapon tests

Scientific Reports (2019)

Frédérique Eyrolle Yoann Copard Hugo Lepage Loïc Ducros Amandine Morereau

Abstract Tritium of artificial origin was initially introduced to the environment from the global atmospheric fallout after nuclear weapons tests. Its level was increased in rainwaters by a factor 1000 during peak emissions in 1963 within the whole northern hemisphere. Here we demonstrate that tritium from global atmospheric fallout stored in sedimentary reservoir for decades as organically bound forms in recalcitrant organic matter while tritium released by nuclear industries in rivers escape from such storages. Additionally, we highlight that organically bound tritium concentrations in riverine sediments culminate several years after peaking emission in the atmosphere due to the transit time of organic matter from soils to river systems. These results were acquired by measuring both free and bound forms of tritium in a 70 year old sedimentary archive cored in the Loire river basin (France). Such tritium storages, assumed to be formed at the global scale, as well as the decadal time lag of tritium contamination levels between atmosphere and river systems have never been demonstrated until now. Our results bring new lights on tritium persistence and dynamics within the environment and demonstrate that sedimentary reservoir constitute both tritium sinks and potential delayed sources of mobile and bioavailable tritium for freshwaters and living organisms decades after atmospheric contamination.

10.1038/s41598-019-47821-1

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A brief history of origins and contents of Organically Bound Tritium (OBT) and 14C in the sediments of the Rhône watershed

The Science of The Total Environment (2018)

Frédérique Eyrolle Hugo Lepage Yoann Copard Loïc Ducros David Claval

10.1016/j.scitotenv.2018.06.074

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Citations (19)

Origine et devenir du tritium au sein des hydrosystèmes continentaux méditerranéens français

Loïc Ducros

Initialement emis lors des essais nucleaires atmospheriques, le tritium (3H) est l’un des principaux radionucleides rejetes par les installations nucleaires. Il est present dans toutes les composantes environnementales sous differentes formes, libres (HT, HTO, CH3T) ou liee a la matiere organique (TOL). Le tritium suit les memes dynamiques d’incorporation et de degradation dans les organismes que l’hydrogene et se met rapidement a l’equilibre avec le milieu ambiant. Des etudes ont montre un desequilibre TOL/HTO dans differents compartiments et matrices environnementales. Ce travail vise a expliquer la variabilite des concentrations en 3H et l’origine des desequilibres observes en se basant sur l’hypothese de la remanence. Une approche multi-echelles axee sur le role du transfert differe de la matiere organique entre les compartiments environnementaux a ete menee. Les resultats acquis ont permis d’etablir des gammes de concentrations en HTO dans des cours d’eau non influences par des rejets trities et d’identifier les principaux parametres lies a la variabilite observee. Les resultats ont aussi permis de comprendre l’origine du TOL a partir d’analyses statistiques, qui tendent a confirmer que des zones de remanence en TOL issus des essais nucleaires, peuvent conduire a des desequilibres significatifs entre formes libre et liee. De plus, l’etude d’une archive sedimentaire a montre l’existence d’un pic de concentrations en TOL en profondeur, provenant vraisemblablement des retombees de ces essais. Enfin, l’instrumentation d’un site atelier, a proximite d’installations nucleaires, a permis de confirmer l’existence d’un marquage de la matiere organique et la remanence du TOL.

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Citations (1)