. "Flood mitigation at watershed scale through dispersed dry dams, analysis of the impact on discharge-frequency regimes" . "Increase in losses of lives and properties due to flooding in recent decades has driven the search for efficient flood management strategies. At the watershed scale, zones of interest are found dispersed and intensified due to development pressures. Protection against flooding for the entire watershed is thus necessary. Appropriate mitigation strategies at watershed scale through dispersed dry dams are explored presently. Dry dams are flood mitigation structures, which reduce flood peaks while respecting the normal river regime. During flooding, the dam holds back excess flood volume and depreciates them to manageable levels for downstream areas. A chain of models are employed to test potential mitigation strategies at watershed scale, on a French basin. The chain is constituted by a rainfall generator for the simulation of space-time variable rainfall fields (TBM), a distributed rainfall-run-off model to simulate surface run-off (MARINE) and a hydraulic model (MAGE) to route the surface run-off to the watershed outlet. The aim is to simulate representative instantaneous discharge-frequency regimes of the watershed, at points of interest and then introduce dry dams along the drainage network, to simulate mitigated instantaneous discharge-frequency regimes. An attenuation factor is defined to measure the domain of achievable mitigation efficiency. Using this approach, it is possible to gauge the flood frequencies which can be mitigated given the parameters of available storage volume, location and dimensions of the dry dams. Thus the efficiency and performance limit of dry dam mitigation projects is illustrated. The importance of working at watershed scale and discharge-frequency regime scale is shown in the present work." . "En raison de l'extension des zones vuln\u00E9rables ou d'une possible aggravation de l'al\u00E9a, le risque d'inondation pourrait continuer de s'accroitre dans les ann\u00E9es \u00E0 venir. Des strat\u00E9gies d'att\u00E9nuation, capables de respecter les rivi\u00E8res et prenant en compte l'ensemble des bassins versants s'av\u00E8rent indispensables. Le travail cherche \u00E0 caract\u00E9riser l'effet d'un ensemble de \u00ABbarrages secs\u00BB sur le r\u00E9gime d'une rivi\u00E8re. Les barrages disposant d'un orifice tel que la rivi\u00E8re s'y \u00E9coule en r\u00E9gime normal; \u00E0 l'occasion d'une crue l'exc\u00E8s de d\u00E9bit est retenu par le barrage et restitu\u00E9 ensuite. Sur un bassin versant r\u00E9el une cha\u00EEne de mod\u00E9lisation est mise en place de fa\u00E7on \u00E0 reconstruire par simulation un r\u00E9gime de d\u00E9bit instantan\u00E9-fr\u00E9quence observ\u00E9. La chaine comprend un mod\u00E8le g\u00E9n\u00E9rateur de pluies spatialement variables, un mod\u00E8le spatialis\u00E9 de pluie-d\u00E9bit et un mod\u00E8le d'\u00E9coulement en rivi\u00E8re. Elle permet de mod\u00E9liser les crues puis d'introduire les barrage secs dispers\u00E9s pour construire une r\u00E9gime instantan\u00E9 \u00ABnaturel\u00BB puis att\u00E9nu\u00E9 par les barrages. Un indicateur d'efficacit\u00E9 est d\u00E9fini pour mesurer l'att\u00E9nuation des crues sur l'ensemble des fr\u00E9quences. L'importance de travailler \u00E0 l'\u00E9chelle du bassin versant et \u00E0 l'\u00E9chelle du r\u00E9gime d\u00E9bit-fr\u00E9quence est d\u00E9montr\u00E9e." . "Th\u00E8ses et \u00E9crits acad\u00E9miques" . . . "Spectrom\u00E9trie de masse" . "2008" . . "Probl\u00E8me inverse de diffusion" . "R\u00E9duction des crues \u00E0 l'\u00E9chelle du bassin versant au moyen de barrages secs dispers\u00E9s, analyse de l'impact sur l'ensemble du r\u00E9gime d\u00E9bit-fr\u00E9quence" . . . . "R\u00E9duction des crues \u00E0 l'\u00E9chelle du bassin versant au moyen de barrages secs dispers\u00E9s, analyse de l'impact sur l'ensemble du r\u00E9gime d\u00E9bit-fr\u00E9quence" . . "Statistique bay\u00E9sienne" . "Text" . "Chromatographie" . . . . . . .