Assimilation de données Méthode des volumes finis Modèle hydraulique 2D Filtre de Kalman PollutionIn this paper, the 2D mathematical water pollution model describing the transportdiffusion processes of some contaminant substances in Thanh Nhan Lake in Hanoï is considered. The finite-volume method is used to solve the model equations. The Singular Evolutive Interpolated Kalman filter is applied to evaluate the pollution level at arbitrary mesh point based only on a small number of measurement points.