Les précipitations orographiques organisées en bandes dans la région Cévennes-Vivarais. Caractérisation et contribution au régime pluviométrique

Abstract : This thesis is dedicated to the study of a particular kind of shallow convection in the Cévennes area. This shallow convection is associated with orographic banded rainfall. Even if their intensity is small, they impact on hydrology since their duration. We hope to understand process linked with this rainfall and to evaluate their contribution to the rainfall regime in the area. The first step consists on the elaboration of a data base of orographic banded rainfall events. Indeed, until now, only 20h of orographic banded rainfall have been observed. This data base is built thanks to dynamical and rainfall criteria and then completed with linear and non-linear statistic methods. Next, the atmospheric conditions propice to the triggering of shallow convection are identified with radiosoundings, ERA40 reanalysis and numerical simulations (with MesoNH). Finally, the contribution of this rainfall is evaluated by comparing the accumulation of rainfall over the data base to the accumulation of rainfall over the whole period 1976-2005. Despite incertainties, this contribution is not negligible and suggests the interest to develop an observatory network to better observe the shallow orographic banded convective events.
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Contributor : Angelique Godart <>
Submitted on : Friday, November 13, 2009 - 10:10:22 AM
Last modification on : Friday, April 5, 2019 - 8:07:02 PM
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Angelique Godart. Les précipitations orographiques organisées en bandes dans la région Cévennes-Vivarais. Caractérisation et contribution au régime pluviométrique. Océan, Atmosphère. Université Joseph-Fourier - Grenoble I, 2009. Français. ⟨tel-00431254⟩

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