L'Homme attiré par la ville consomme de la ressource en terre agricole non renouvelable pour agrandir les villes et les doter d'espaces végétalisés de qualité. De plus l'homme urbain est un très grand producteur de déchets non recyclables. L'objectif de ce travail a été d'évaluer la capacité des végétaux à se développer dans des sols construits à p...
Dans la vallée du fleuve Sénégal et le delta intérieur du fleuve Niger, la crue annuelle inonde un vaste lit majeur par des chemins d'écoulement complexes. Pour représenter la propagation d'écoulement entre lits mineur et majeur sur ces zones très plates, on utilise un modèle sans données topographiques initialement développé pour les lits mineurs ...
Urban floods cause high damages and thus mapping of flood risk is essential for protection and evacuation planning. To obtain such mapping, hydrodynamic modelling is central because it provides water depths and velocities everywhere and along the whole flood period. The case of the 1988 flood in Nîmes is presented as an example of the method to get...
Description du sujet. Ce travail présente et analyse l'évolution de la conductivité hydraulique des surfaces cultivées et en jachère des formations pédologiques sablo-limoneuses couvrant les altérites du socle cristallin de l'Ouest du Niger. Le travail est mené en des emplacements choisis pour leur représentativité dans la zone sahélienne cultivée....
Published in La Houille Blanche
Because stakes are concentrated in urban environment, flood modelling should be carried out there with high accuracy. However, uncertainties remain important because of: - the estimate of the inputs, these inputs being either rainfalls, or flows coming from the upstream basin or from the exchanges with the sewage network; - the complexity of the pr...
Since the 1980s intensive anthropogenic disturbances have affected the channel of the St. George branch, the southern distributary of the Danube River. The meander cutoff programme since 1984–1988 induced different hydrosedimentary impacts on the local distribution of river flow velocities, discharge, and sediment fluxes between the former meanders...
A water mass analysis of the Coral Sea thermocline waters provides a description of their distribution, pathways and mixture based on recent oceanographic cruises in this region of strong western boundary currents. The Optimum Multiparameter method is used to determine the relative contribution of core water masses based on their measured temperatu...
The Canary Upwelling System (CUS), a major eastern boundary upwelling system, sustains large crossborder fisheries of small pelagic fish, which poses the question of stock connectivity. Studies suggest that ichthyoplankton transport from the northwest African coast to the Canary Islands (CI) is facilitated by coastal- upwelling associated filaments...
In this study, we document and interpret the characteristics of the Intra-seasonal Kelvin wave (ISKw) in the Pacific over the 1989–2011 period, based on observations, a linear model, and the outputs of an Ocean General Circulation Model (OGCM). We focus on the wave activity during the Central Pacific (CP) El Niño events contrasting with the extraor...
