In this study, we investigated the ability of a physics based 2-D model (TELEMAC2D coupled with SISYPHE) to reproduce the braiding dynamics from the initiation, starting from an initially flat bed with a central incision, to the evolution of the pattern resulting from different flow, sediment forcings and sediment transport formulas. The idealized river model remained close, dimensionwise, to flume experiments. The choice of boundary conditions, taken as simple as possible, allowed to directly link the result to the constitutive relations used and an isolated analysis of the model capability to reproduce the morphology and the dynamic characteristic of braided streams. The simulation results showed that the model successfully reproduced the initiating phase of the braiding pattern.