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Correction of upstream flow and hydraulic state with data assimilation in the context of flood forecasting

Ricci, Sophie and Piacentini, Andrea and Thual, Olivier and Le Pape, Etienne and Jonville, Gabriel Correction of upstream flow and hydraulic state with data assimilation in the context of flood forecasting. (2011) Hydrology and Earth System Sciences, vol. 15 . ISSN 1027-5606

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Official URL: http://dx.doi.org/10.5194/hess-15-3555-2011

Abstract

The present study describes the assimilation of river water level observations and the resulting improvement in flood forecasting. The Kalman Filter algorithm was built on top of a one-dimensional hydraulic model which describes the Saint-Venant equations. The assimilation algorithm folds in two steps: the first one was based on the assumption that the upstream flow can be adjusted using a three-parameter correction; the second one consisted of directly correcting the hydraulic state. This procedure was applied using a four- day sliding window over the flood event. The background error covariances for water level and discharge were repre- sented with anisotropic correlation functions where the cor- relation length upstream of the observation points is larger than the correlation length downstream of the observation points. This approach was motivated by the implementation of a Kalman Filter algorithm on top of a diffusive flood wave propagation model. The study was carried out on the Adour and the Marne Vallage (France) catchments. The correction of the upstream flow as well as the control of the hydraulic state during the flood event leads to a significant improve- ment in the water level and discharge in both analysis and forecast modes.

Item Type:Article
Additional Information:© Author(s) 2011. This work is distributed under the Creative Commons Attribution 3.0 License. European Geosciences Union is an Interactive Open Access journal
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > Ministère de l'Ecologie, du Développement durable et de l'Energie (FRANCE)
Laboratory name:
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Deposited By: Olivier THUAL
Deposited On:05 Nov 2012 15:33

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