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Etude de l’impact orographique sur la structure microphysique horizontale et verticale des précipitations

Thèse de Jimmy ZWIEBEL soutenue le 10 décembre 2015

par Brice Boudevillain - 20 décembre 2016 ( maj : 22 décembre 2016 )

Encadrants : J. Van Baelen (LaMP), S. Anquetin

The study and understanding of precipitating systems is of major concern in areas facing a high hydrometeorological risk such as southeastern France (Gard 2002, Var 2010). Mountainous areas, like the Cévennes region, will have a significant impact on both the resulting natural hazard and the structure of precipitations (orographic enhancement, systems and convection organization).

The study will focus on the vertical and horizontal structure of precipitation in complexe orography at different scales and will develop along the following steps :

- Meso-scale monitoring of the precipitating systems (synoptic ingredients, organization) and fine scale analysis of the vertical and horizontal variability of precipitations using a network of high resolution radars, MRR (micro rain radar) and disdrometers deployed during the HYMEX campaign.
- Extraction the system physical parameters from the radar network observations (Isotherm 0°C, Vertical Profil of Reflectivity, cloup top altitude ..) and identification of main microphysical process.
- Detailed microhpysics modeling and finer parameterization in numerical meso-scale models.

This work will be closey conducted between the LaMP (UBP, Clermont-Ferrand) and the LTHE (University de Grenoble) in the framework of HYMEX (HYdrological cycle in Mediterranean EXperiment)

Voir en ligne : Résumé et manuscrit de thèse





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