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Theses

Gestion des développements d'algues benthiques en canaux : modèles pour des stratégies de régulation hydraulique

Abstract : Algae developments in open-channel networks induce strong constraints for the network management. The physical and chemical nuisances linked to these developments require alternative management strategies. The thesis proposes an original method for these algae management based on the hydraulic control of the system using ushing-ows. These ushes consist in detaching a part of the xed algae by increasing the hydraulic shear stress exerted on the algae xed on the substratum. The re-suspension of algae in the water column induces a turbidity peak which also has to be controlled. The proposed approach aims at characterizing and modelling the processes of algae development, detachment and transport during the ushes. Experimental monitoring of the growth phase is conducted in experimental umes. The biomass samples are used to calibrate a model of the algal growth which integrates the hydrodynamic ect and the algae sensitivity to hydrodynamic perturbations. Flushing strategies are experimented on two real canals located in the Mediterranean region. A model of the xed and drift algae dynamics in response to a ush is then developed and calibrated on the observed turbidity plumes. Finally, a control framework based on a linear model is proposed for the turbidity control during a ush. An open-loop control is rst developed, then an adaptative feedback controller is tested to estimate unknown parameters such as initial biomass.
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  • HAL Id : tel-02594648, version 1
  • IRSTEA : PUB00031261

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Ophélie Fovet. Gestion des développements d'algues benthiques en canaux : modèles pour des stratégies de régulation hydraulique. Sciences de l'environnement. Doctorat Systèmes intégrés en Biologie, Agronomie, Géosciences, Hydrosciences et Environnement, Eaux Continentales et Société, Montpellier SupAgro, 2010. Français. ⟨tel-02594648⟩

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