Poster De Conférence Année : 2025

Modeling pesticides fate in a river network using the aquatic biogeochemistry model pyNuts-Riverstrahler

Résumé

Understanding the processes controlling the transfer of pesticides in natural environments is a crucial issue for the management of water resources, and more particularly for drinking water. Since their application in agricultural environments, the life cycle of these molecules includes the processes of infiltration into the upper part of the soil, where they interact with organic matter and microorganisms, the formation of metabolites due to chemical or bio-degradation, their transfer from the unsaturated zone to the saturated zone and finally their transport along the river network. Most of the models developed to simulate pesticide transfer and transformation processes are restricted to the top soil, in interaction with vegetation, and generally implemented at the plot level (PRZM (Carsel et al., 1985), PEARL (Leistra et al., 2001)) or on small catchments (PESHMELBA (Rouzies et al., 2019)). Only a few models provide spatially explicit routing of pesticides to groundwater and surface water (Centanni et al., 2023). The challenge is therefore to couple distributed hydrological and hydrogeological models to provide an integrated multi-scale approach to the life cycle of pesticides, from the agricultural plot to the macro-regional territory. Our research relies upon an existing combination of different models that includes an agronomic model (Stics, Queyrel et al. (2016)), a distributed physics-based hydrogeological model (CaWaQS, Flipo (2005)), and a river biogeochemical model (Pynuts-Riverstrahler), and intends to integrate to it the reactive transfer of pesticides while this coupling was initially dedicated to nutrients life-cycle (Renaud et al., 2024). In this poster, we present the developments made to the aquatic biogeochemistry model pyNuts-Riverstrahler to simulate the life cycle of pesticides. The model can now be used to monitor any active substance and its metabolites at any scale of river networks. The main processes implemented are sorption on suspended particles linked to the sedimentation/re-suspension dynamics, and biodegradation processes in the water column and the benthic layer. The model was validated by simulating the transfer of Atrazine and its main byproduct Desethylatrazine at the scale of the Seine River catchment, and comparing the results with the observation data available in the French national surface water quality database Naïade.

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hal-05316259 , version 1 (15-10-2025)

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  • HAL Id : hal-05316259 , version 1

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Adrien Renaud, Vincent Thieu, Helene Blanchoud, Marie Silvestre. Modeling pesticides fate in a river network using the aquatic biogeochemistry model pyNuts-Riverstrahler. 3rd OZCAR-TERENO Conference, Sep 2025, Paris, France. ⟨hal-05316259⟩
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