ABSTRACT
ABSTRACT: This study focuses on the sediment transport processes during a flushing event of an Alpine reservoir. The reservoir had an initial storage volume of about 1.4 Mio. m3. However, echo-soundings performed in 2007 showed that approximately 890,000 m3 of sediments are already deposited in the reservoir. This represents an annual sedimentation rate of about 6.1 percent of the initial reservoir volume. An open source three-dimensional numerical model was used to simulate the flushing process. Echo-soundings performed before and after the flushing event were used to set up the simulation and validate the morphological bed changes calculated by the numerical model. Additionally, an extensive sensitivity analysis was carried out by testing several sediment transport formulae. It was found that the simulations using the bed load transport formulae derived by Van Rijn and Meyer-Peter Müller showed the best agreement with the measured data.
