A two-phase model for sediment transport and bed evolution in unsteady river flow

The commonly used approach for modelling unsteady river morphological processes considers Saint Venant-Exner equations, with local equilibrium condition for the solid discharge evaluation. Despite its widespread application, some physical behaviors related to sediment dynamics are not presented by the above model. Recently, some different morphological models have been proposed, in order to overcome these limitations. In this paper a two-phase morphological model is presented. The model eigenstructure is analysed and its hyperolic nature is shown. Simulations of laboratory documented test-cases are finally carried out, enlightenin the potentialities of the proposed model.