Author(s): M. D. Bui; M. Eizel-Din; P. Rutschmann
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Keywords: No Keywords
Abstract: The depth-averaged model FAST2D using a finite-volume method with boundary-fitted grids has been applied to simulate morphological processes due to flooding on the Inn River. The numerical model consists of three basic modules: a hydrodynamic module describing the depth-averaged flow and the water surface elevation, a sediment transport module, and a sediment balance module providing the sedimentation and erosion rate and the bed level deformation. The secondary flow transport effects are taken into account by adjusting the dimensionless diffusivity coefficient in the depth-averaged version of the k-ε turbulence model. The numerical model has been developed, tested and validated previously by computing various flow situations in laboratory channels and natural rivers. This paper presents the results of an application of the model to the 100-year flood of August 2005 in the Inn River stretch near Innsbruck. The hydraulic predictions are compared with field data measurements, for which the water elevation results show generally good agreement. Some problems of model calibration for sediment transport are discussed. Calculations have been carried out to study morphological characteristics under this extreme flood condition in the river stretch.
Year: 2009