ABSTRACT
ABSTRACT: The Saint-Egrève dam is located downstream of the city of Grenoble, on the Isere river in France. Over time, the reservoir has silted up. Frequent flushing operations allow the maintenance of a channel in the reservoir, but siltation bank formation on either side of the channel is irreversible. Due to the urban location of the reservoir, maintaining the freeboard of the upstream dike of the reservoir during the design flood is a major issue. Nowadays, the evolution of the filling is such that the channel erosion during the flood must be taken into account to estimate a realistic freeboard. During a first part of the study, 1D morphodynamics simulations were performed. The model was calibrated and validated with measured sediment fluxes and then applied to a project design situation. A second part of the study consisted on performing 2D and 3D numerical simulations and comparing results with the 1D model.
