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A 1D-2D coupled numerical model is presented in this work. 1D and 2D models are formulated using a conservative upwind cell-centered finite volume scheme. The discretization is based on cross sections for the 1D model rios. It is also applied to a real world configuration, where the flood wave propagation in the river bed is simulated by means of a 1D model and the inundation of the riverside is dealt with a 2D model. The computational gain is also analysed.

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