Long term evolution of a dam reservoir subjected to regular flushing events
- 1Irstea, UR HHLY, centre de Lyon-Villeurbanne, 5 rue de la Doua, CS 70077, 69626 Villeurbanne cedex, France
- 2Compagnie Nationale du Rhône, 2 rue André Bonin, 69316 Lyon Cedex 04, France
Abstract. An analysis of the long term morphological evolution of the Génissiat reservoir (France) is provided. First, a methodology for bathymetric data processing and reservoir sediment volume budget calculation is described. An estimation of global uncertainties in volume calculation is proposed. The reservoir bathymetric budget for several dam flushing events and interflush periods is presented, showing the global decrease of deposited sediment volume with time. The spatial dynamics of the reservoir subreaches is highlighted and typical patterns in flush and interflush periods are identified.