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Simulations météorologiques sur site rural à topographie non plane par emboîtement de domaines avec le modèle SUBMESO

Abstract : Estimating long-range sound propagation over a rural site with complex terrain requires taking into account variations of the micrometeorological fields in the lower part of the atmospheric boundary layer. Our purpose is to simulate wind and temperature fields over moderately complex terrain with high resolution, for characterizing the micrometeorology of sites with non-flat topography for acoustic computations.
Two numerical tools are developed in association with the main platform of the study, the Submeso code. A meteorological pre-processor MPP is integrated, to construct vertical profiles of wind and temperature over the whole boundary layer, from recent parameterisations. These profiles are utilized to drive the flow into the computational domain. The integration of the MPP into Submeso is validated with Large-Eddy Simulations of two different flows over flat terrain: a flow in convective conditions and a shear-driven flow in neutral conditions. The results are compared favourably with Moeng & Sullivan (1994). In order to both reach local high resolution and take into account regional meteorological conditions, a grid-nesting module is coupled with Submeso. A particular attention is given to choosing the choice of the optimal boundary conditions for the nested domain, based on a bibliographical study pointing at the numerical problems induced by this technique. The method is assessed through two configurations: a shear-driven flow in neutral conditions and the flow over a 2D hill in stable conditions.
The developed numerical tools are applied to simulate the flow over the real site of the small valley of the Vicoin: with a unique grid with convective and neutral academic conditions on the one hand, and with nested grids (with one-way interaction) in “realistic” convective and stable conditions selected from experimental data on the other hand. Special care is put on the analysis of the observed topographical effects, in comparison with in situ measurements.
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https://tel.archives-ouvertes.fr/tel-00003408
Contributor : Thibauld Pénelon <>
Submitted on : Tuesday, September 23, 2003 - 10:38:38 AM
Last modification on : Thursday, January 11, 2018 - 6:17:20 AM
Long-term archiving on: : Wednesday, November 23, 2016 - 3:39:51 PM

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  • HAL Id : tel-00003408, version 1

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Thibauld Pénelon. Simulations météorologiques sur site rural à topographie non plane par emboîtement de domaines avec le modèle SUBMESO. Modélisation et simulation. Ecole Centrale de Nantes (ECN); Université de Nantes, 2002. Français. ⟨tel-00003408⟩

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