First real-time monitoring system of fresh-water phytoplanctonic microorganisms: the PROLIPHYC system - Application to Grangent reservoir on the Loire river (France) - Le premier système de surveillance en temps réel des micro-organismes phytoplanctoniques en eaux douces : le système PROLIPHYC - Application à la retenue de Grangent sur la Loire (France)

Catherine Freissinet (1) , Agnès Cabal (1) , Aurélien Perrin (1) , Stéphane Duflo (1) , Jean-François Humbert (2) , Bruno Tassin (3) , Brigitte Vinçon-Leite (3) , Bruno J. Lemaire (3) , Briac Le Vu (3) , Catherine Quiblier (4) , Marie-José Salençon (5)

1 SOGREAH - SOGREAH Consultants, Water and Territorial Service Group
2 Bioemco - Biogéochimie et écologie des milieux continentaux
3 LEESU - Laboratoire Eau, Environnement et Systèmes Urbains
4 Ecosystèmes et Interactions Toxiques
5 EDF R&D - EDF R&D

In the current context of the quality degradation of continental aquatic ecosystems, the PROLIPHYC system, as presented here, had the aim of developing, validating and industrializing a real time monitoring and warning system for the management of the risks linked to the proliferation of phytoplankton, including cyanobacteria, in water bodies and slow-flowing rivers. The development of the PROLIPHYC buoy was a big technological challenge. The buoys carried a basket fitted with sensors for measuring physical, chemical and biological parameters at various depths. Data can be received and processed in real time. Moreover, buoys are equipped with a unique anti-fouling system. Initially, a " Small Lake " (SM) buoy, resulting from a prototype, was developed. It is well adapted to shallow environment, like Lake Enghien-les-Bains where it has been tested. In a second time, a " Large Lake " (LL) buoy was developed, specially designed for aquatic system presented important waves. After the presentation of the buoy development, the paper gives the example of the work made with the LL one on the Grangent reservoir. This large lake formed by a dam on the river Loire is characterized by the summer proliferation of the cyanobacteria Microcystis aeruginosa. In particular, raw and modelized data for biomass and temperature are presented, and their possible use in predictive modeling for the feeding of the warning system. Finally, the work presented here, shows that the PROLIPHYC system, that combines buoys, sensors, an informatic system for acquisition, processing, validation, and warning can represent a decision-aid system for managers of water bodies who are faced to the problem of phytoplanktonic proliferations.

Domaines: Sciences de l'environnement

Catherine Freissinet, Agnès Cabal, Aurélien Perrin, Stéphane Duflo, Jean-François Humbert, et al.. First real-time monitoring system of fresh-water phytoplanctonic microorganisms: the PROLIPHYC system - Application to Grangent reservoir on the Loire river (France) - Le premier système de surveillance en temps réel des micro-organismes phytoplanctoniques en eaux douces : le système PROLIPHYC - Application à la retenue de Grangent sur la Loire (France). International Symposium on Dams for A Changing World (ICOLD 2012 Kyoto), International Commission on Large Dams, 2012, Kyoto, Japon. p 249-271, article Q. 92 - R. 18. ⟨hal-00817820⟩