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Assessment of the quantities of herbicides and nutrients brought down by the river Charente to the coast and modelling of the dispersion of atrazine in the Marennes-Oléron bay

Abstract : Our study aims at making progress the estimate of herbicide and nutrient inputs to the Marennes-Oleron bay which could influence summer oysters mortalities, and to bring a better understanding of the impact on coastal ecosystems by modelling the dynamics of these compounds in the shellfish-farming area. The development of a strategy adapted to the river Charente and its estuary reveals that agricultural activity on the watershed area is omnipresent, as well on the level of the nitrogen as on the one of herbicides contributions. It is thus necessary to specify Charente fluxes, which is the main tributary of the Marennes-Oleron bay, in order to better characterize its impact on shellfish-farming activity. Hydrodynamic modelling will constitute an invaluable help in the risk assessment with respect to pesticides, by specifying the periods of the high and low concentrations of these molecules and the biotope exposure durations.
Mots-clés : MARENNES OLERON BASSIN
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https://hal.inrae.fr/hal-02589838
Contributor : Migration Irstea Publications <>
Submitted on : Friday, May 15, 2020 - 1:48:22 PM
Last modification on : Thursday, July 1, 2021 - 5:32:32 PM

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  • HAL Id : hal-02589838, version 1
  • IRSTEA : PUB00022983

Citation

Dominique Munaron, Jean-François Dubernet, François Delmas, Jean-Yves Stanisière, Pierre Scribe. Assessment of the quantities of herbicides and nutrients brought down by the river Charente to the coast and modelling of the dispersion of atrazine in the Marennes-Oléron bay. Cahier de biologie marine, 2006, 47, pp.85-92. ⟨hal-02589838⟩

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