Author(s): S. Baranya; J. Jozsa
Linked Author(s): János Józsa
Keywords: No Keywords
Abstract: Three-dimensional CFD modelling approach was used to study morphological changes of an eight km long reach in River Danube in Hungary. The numerical model applies a k-ε closure for modelling turbulence effects. Model parameterization was carried out based on detailed field surveys by means of ADCP measurements and bed topography survey as well as suspended sediment and bed material sampling. Representing local features typical to the sandy downstream part of the river in the country, a non-uniform sediment distribution handled by multiplefraction approach is applied. By using the flow and sediment data collected prior to and during a moderate flood, for proper calculation of bed-changes different experimental formulas were tested including the sensitivity analysis of their parameters on e.g. the estimation of equilibrium sediment concentration close to the river bed. The assessment and comparison of numerical results and field measurement data were facilitated by maps of bed changes.
Year: 2009