Environmental Science and Climate Research(ESCR)

Cerema, Direction Technique Risques, Eaux et Mer, 138 rue de Beauvais, CS60039, 60280 Margny-les- Compiegne, France

Publications

• Research Article   
  Reducing the Dimension of Infered Time-Varying Boundary conditions to Improve Water Levels Prediction in the Gironde Estuary using Telemac2D and an Ensemble Kalman Filter
  Author(s): Vanessya Laborie*, Sophie Ricci and Nicole Goutal
  
  In order to better predict high water levels and floods in the Gironde estuary, a Telemac 2D numerical model is combined with a stochastic Ensemble Kalman Filter (EnKF). The hydrodynamic model calculates water depths and velocity fields at each node of an unstructured mesh. The EnKF corrects the inputs of the model, i.e both scalar parameters and timevarying forcings, as it assimilates in situ water levels observations. Upstream, the model fluvial boundaries are respectively located at La R ́eole and Pessac on the Garonne and Dordogne rivers. The maritime boundary is 32 km off the mouth of the Gironde estuary, located at Le Verdon. It is assumed that the uncertainty in time-varying boundary conditions is well approximated by a Gaussian Process (GP) characterized by its autocorrelation function and associated correlation time scale. The coefficients of the truncated Karhunen- Lo`eve d.. Read More»
  

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