Enhanced ensemble-based 4DVar scheme for data assimilation

Yin Yang (1) , Cordelia Robinson (1) , Dominique Heitz (1) , Etienne Mémin (1)

1 FLUMINANCE - Fluid Flow Analysis, Description and Control from Image Sequences

Ensemble based optimal control schemes combine the components of ensemble Kalman filters and variational data assimilation (4DVar). They are trendy because they are easier to implement than 4DVar. In this paper, we evaluate a modified version of an ensemble based optimal control strategy for image data assimilation. This modified method is assessed with a Shallow Water model combined with synthetic data and original incomplete experimental depth sensor observations. This paper shows that the modified ensemble technique is better in quality and can reduce the computational cost.

Mots clés: Shallow Water model; Data assimilation; Optimal control; Depth sensor; Ensemble methods

Domaines: Mécanique des fluides [physics.class-ph]; Sciences de l'environnement; Mathématiques [math]

Yin Yang, Cordelia Robinson, Dominique Heitz, Etienne Mémin. Enhanced ensemble-based 4DVar scheme for data assimilation. Computers and Fluids, 2015, 115, 15 p. ⟨10.1016/j.compfluid.2015.03.025⟩. ⟨hal-01144923⟩