3D numerical modelling of morphological bed changes in the Danube River

摘要

This paper describes numerical modelling of morphological bed changes in the Danube River. The reach modelled in this study has a length of 4 km and is located between Vienna and the Austrian-Slovakian border. The Danube River in this reach is characterised by a great width-to-depth ratio leading to an alternate bar configuration. The August 2002 flood event with a peak of 10,000 m~3/s was modelled. The numerical code is based on a finite volume approach solving the Navier-Stokes equations to obtain the water velocity and the bed shear stress, and the sediment transport is computed by an empirical formula. In the present study, the model was modified by introducing a new sediment transport formula by Wu et al. (2000). Results show a fairly good agreement between measured and calculated bed changes.