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Cet ouvrage livre les premiers résultats des recherches sur les occupations amérindiennes du bassin du Sinnamary (1660-220 BP), menées à l’occasion de la construction par Électricité de France du barrage de Petit Saut (Guyane française). À une approche méthodologique sur le milieu tropical sylvestre et fluvial, succèdent l’étude des sites de plein air et un point sur le phénomène de terra preta et des paléoincendies. Pour la première fois sont proposés un cadre typologique et un vocabulaire appliqués aux séries lithiques et aux sites à polisson, ainsi qu’une analyse de la céramique selon deux approches complémentaires : détermination des lieux de fabrication à partir de la composition chimique des pâtes, codification des formes et des décors des quelque 22 000 artefacts enregistrés. Après la publication consacrée à la période coloniale de cette région (dAf 60), ce volume constitue une solide contribution au renouvellement de l’historiographie du plateau des Guyanes. This work introduces the initial results of research at sites occupied by Native Americans in the Sinnamary basin (1660-220 BP), carried ont at the time of the construction of the Petit Saut dam by Electricité de France in French Guyana. A methodological approach pertaining to the tropical sylvan and riparian milieu is followed by a study of the open-air sites, and a commentary focusing on the phenomenon of terra preta and palaeolithic fires. For the first time a typological tramework and a vocabulary are proposed for reference to lithic senes and polishing-tool sites. This work also includes a study of ceramics using two complementary approaches: determination of place of manufacture based on the Chemical make-up of the pestes employed, and codification of the forms and motifs of the 22,000 objects registered. Following up on the publication devoted to the colonial period in this region (dAf 60), this volume makes a signifiant contribution to the renewal of histonographical work on the Guyana plateau.

This paper describes the development of the thunderstorm weather information management system “CB WIMS” within the European Integrated Project FLYSAFE and presents results from applications in case studies over the terminal manoeuvring area of airport Paris Charles de Gaulle.

International audience; The potential value of operational Doppler radar networks for high resolution wind forecast verification is investigated through comparing wind outputs of the cloud resolving model AROME against newly available operational multiple-Doppler winds in northern France. Quantitative comparisons of radar and model winds for a 16-h frontal precipitation event show good agreement, with differences in wind speed (resp. direction) generally comprised between ±2.5 m.s−1 (resp. ±15°). Power spectra deduced from the scale decomposition of radar and model outputs also show good agreement through all scales. The method is also applied to validate the divergence structures as analyzed by AROME's 3Dvar assimilation system that considers, among a comprehensive set of observation types, the same radial velocities than those considered in the wind retrieval.