Development of a hydro-morphodynamic Model for Sediment Management in the Rosenheim Reservoir

In this study, a hydromorphological model of the Rosenheim reservoir, one of the impoundments formed by a chain of run-of-river power plants along the Inn River (Germany), was developed by coupling TELEMAC-2D and SISYPHE. Available bathymetry surveys, conducted after the high magnitude flood events in 2005 and 2013, were used for calibration and validation respectively. The implementation of the subroutines modified by the Chair of Hydraulic and Water Resources Engineering of the Technical University of Munich together with the selection of a low angle of friction of the sediment for the secondary currents correction produced a good match between the measured and simulated cross-section profiles. The model's ability to predict the bed variation after the event was evaluated using the Brier Skill Score (BSS) and considering the initial bathymetry as the baseline prediction. Applying this technique, the three following parameters were considered: (i) phase error to assess the accuracy of the location of erosion and deposition processes, (ii) amplitude error to evaluate the bed evolution magnitude and (iii) mean map error to estimate the bias of the simulation against the measurements. The model was successfully calibrated and validated with BSS values being in the category of excellent and good together with a high number of cross-sections featuring low phase, amplitude and mean map errors. The calibrated model is presently applied to other flood events in the reservoir.     «

In this study, a hydromorphological model of the Rosenheim reservoir, one of the impoundments formed by a chain of run-of-river power plants along the Inn River (Germany), was developed by coupling TELEMAC-2D and SISYPHE. Available bathymetry surveys, conducted after the high magnitude flood events in 2005 and 2013, were used for calibration and validation respectively. The implementation of the subroutines modified by the Chair of Hydraulic and Water Resources Engineering of the Technical Unive...     »