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Modélisation numérique bidimensionnelle du transport solide et de la dynamique fluviale. Validation sur deux sites en Loire et sur l'Arc.

Abstract : Numerical modelling of morphological evolutions in rivers at a fine spatial scale can be undertaken with models solving the two-dimensional shallow water equations and computing bed load transport and the resulting bed evolution on a mesh representing the topography of the site.
These tools are not widely used in engineering applications yet because there remain large uncertainties on the physical processes to take into account and the corresponding formulations (bed load/suspension, bed forms, graded sediment, bed slope effects ...).
The goal of this work is to assess the possibilities of this kind of tools and to define a methodology for their use. The tool we will use is a commercial modelling package (TELEMAC system) that has most of the necessary functionalities (dry bed, coupling between hydrodynamic and sediment computations, rigid bed, graded sediment...) already implemented.
We will apply this tool on two sites where detailed data are available. One of them is on the Loire river near Fresne-sur-Loire and Ingrandes, the other on the river Arc in Savoie near La Chambre. In both cases, bed load is the main transport process. The periods simulated are floods for which computed bed evolutions are compared to measurements. Longer term simulations (a few years) are also presented in the case of the Loire river. The measured evolutions are well reproduced by the model. The formulations used are coherent between the two cases, but the physical features and processes taken into account are different: dunes in the case of the Loire which is a sand-bed river, graded sediment and bed slope effects in the case of the Arc which is a gravel bed river.
The pertinence of the numerical tool tested is demonstrated, and many advises are presented about the way it should be used. They concern in particular the choice of formulations to represent physical processes depending on the site studied, and the way these formulations should be calibrated with the available data.
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Contributor : Matthieu de Linares <>
Submitted on : Friday, November 30, 2007 - 3:50:07 PM
Last modification on : Thursday, November 19, 2020 - 3:54:29 PM
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Matthieu de Linares. Modélisation numérique bidimensionnelle du transport solide et de la dynamique fluviale. Validation sur deux sites en Loire et sur l'Arc.. Hydrologie. Université Joseph-Fourier - Grenoble I, 2007. Français. ⟨tel-00193119⟩

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