Identifiability and identification of a pollution source in a river by using a semi-discretized model

Nathalie Verdière (1) , Ghislaine Joly-Blanchard (2) , Lilianne Denis-Vidal (3)

1 LMAH - Laboratoire de Mathématiques Appliquées du Havre
2 UTC - Université de Technologie de Compiègne
3 LMAC - Laboratoire de Mathématiques Appliquées de Compiègne

This paper is devoted to the identification of a pollution source in a river. A simple mathematical model of such a problem is given by a one-dimensional linear advection–dispersion–reaction equation with a right hand side spatially supported in a point (the source) and a time varying intensity, both unknown. There exist some identifiability results about this distributed system. But the numerical estimation of the unknown quantities require the introduction of an approximated model, whose identifiability properties are not analyzed usually. This paper has a double purpose: – to do the identifiability analysis of the differential system considered for estimating the parameters, – to propose a new numerical global search of these parameters, based on the previous analysis. Another consequence of this approach is to give the unknown pollution intensity directly as the solution of a differential equation. Lastly, the numerical algorithm is described in detail, completed with some applications.

Mots clés: Semi-discretized model; Identifiability; Parameter Identification; Application to pollution

Domaines: Equations aux dérivées partielles [math.AP]

Nathalie Verdière, Ghislaine Joly-Blanchard, Lilianne Denis-Vidal. Identifiability and identification of a pollution source in a river by using a semi-discretized model. Applied Mathematics and Computation, 2013, 221, pp.1-9. ⟨10.1016/j.amc.2013.06.022⟩. ⟨hal-01993267⟩