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November 29, 2017 to December 1, 2017
LRI
Europe/Zurich timezone

Quantifying and reducing shape and topological uncertainties in front-tracking problems

Dec 1, 2017, 10:00 AM
30m
Auditorium Shannon (LRI)

Auditorium Shannon

LRI

Batiment 660

Speaker

Dr Mélanie Rochoux (CECI, Université de Toulouse, CNRS, CERFACS)

Description

In this talk, we will present a front shape similarity measure adapted to the framework of data assimilation, where uncertainties in the quantities of interest are not only of amplitude-type but also associated with shape and topological uncertainties. The front shape similarity measure derives from image processing and is based on the Chan-Vese contour fitting functional. It can be successfully applied to quantify uncertainties in the quantities of interest, to analyze input-output sensitivities through the use of a Polynomial Chaos surrogate, and to reduce uncertainties through the use of data assimilation, in particular via a joint state-parameter estimation algorithm.
The front shape similarity measure will be illustrated through the example of wildfire [REF], where a front paradigm is used to represent the evolution of the burning area delimitation that moves, undergoes shape and topological changes under heterogeneous orography, biomass fuel and micrometeorology. In this context, the measure is promising to directly assimilate mid-infrared images and design data-driven wildfire modeling strategies.

[REF] M.C. Rochoux, A. Collin, C. Zhang, A. Trouvé, D. Lucor & P. Moireau: Front shape similarity measure for front position sensitivity analysis and data assimilation, ESAIM: Proceedings and Surveys, under review.

Primary authors

Dr Mélanie Rochoux (CECI, Université de Toulouse, CNRS, CERFACS) Dr Annabelle Collin (Inria, Université de Bordeaux, Bordeaux INP) Dr Didier Lucor (LIMSI, CNRS) Dr Philippe Moireau (Inria - LMS, Ecole Polytechnique, CNRS - Université Paris Saclay)

Presentation materials