Influence de l'hydrodynamique sur le fonctionnement écologique des lacs dans les régions métropolitaines à travers le suivi et la modélisation numérique 3D. Application au Lac de Champs-sur-Marne, en France et au Brésil Lac Pampulha

par Denis Furstenau Plec

Projet de thèse en Sciences et Techniques de l'Environnement

Sous la direction de Brigitte VinÇon leite et de Nilo de Oliveira Nascimento.

Thèses en préparation à Paris Est en cotutelle avec l'UFMG - Federal University of Minas Gerais , dans le cadre de SIE - Sciences, Ingénierie et Environnement , en partenariat avec LEESU - Laboratoire Eau Environnement et Systèmes Urbain (laboratoire) depuis le 01-09-2015 .


  • Résumé

    Influence de l'hydrodynamique sur le comportement écologique des lacs dans les régions métropolitaines à travers le suivi et la modélisation numérique 3D. Application au Lac Créteil, en France et au Brésil Lac Pampulha

  • Titre traduit

    Influence of hydrodynamics on ecological behavior of lakes in metropolitan areas through monitoring and 3D numerical modelling. Application to Lake Champs-sur-Marne in France and Lake Pampulha in Brazil


  • Résumé

    The central objective of this PhD project is to evaluate the influence of hydrodynamics on lake ecological functioning, focussing on cyanobacteria behavior, through monitoring and 3D numerical modeling. This general objective will be complemented by specific objectives which will be particularly studied in the field studies in France and in Brazil, but complementary to each other. In France, the specific objectives are: (i) to implement a 3D numerical ecological model to simulate the spatial extent of cyanobacteria blooms in a water body, by coupling the water quality module Delft3D-WAQ to the hydrological module Delft3D-Flow; (ii) to assess the uncertainties of the model results through a sensibility analysis of the parameters and to perform an uncertainty analysis; (iii) to develop an assimilation method of the data collected by a new aerial sensor, designed to detect the presence of cyanobacteria in a lake. This sensor is used in fixed point (alone or networked) or carried by an UAV (drone system) for large waterbodies. In Brazil the specific objectives are: (i) to measure water current velocities over a depth range by applying a high-resolution Acoustic Doppler Current Profiler (ADCP). This type of data is still missing for most waterbodies in Brazil; (ii) to analyze physical (mainly temperature) and ecological data collected in recent years in Lake Pampulha; (iii) to apply a 3D hydrodynamic-ecological model and to investigate the impact of diffuse pollution and lake hydrodynamics in the dynamics of cyanobacteria and (iv) to simulate the impact of future climate and land-use scenarios in Lake Pampulha catchment on the water quality evolution in the lake.