Journal Pre-proof A model of windblown sand coupled with morphodynamic evolution: erosion, transport, deposit and

Modelling unsteady windblown sand dynamics requires not only to treat the sand present in the air as a suspended constituent of a mixture, but also to take care of erosion and sedimentation phenomena and consequently of the morphodynamic evolution of the sand-bed surface, including avalanching, especially in presence of natural or human built obstacles, artifacts, and infrastructures. With this aim in mind, we present a comprehensive multiphase model capable of accurately simulating all the physical phenomena mentioned above, producing satisfactory results, with a reasonable computational e ff ort. As case tests, two- and three-dimensional simulations of dune evolution are reported, as well as windblown sand transport over a straight vertical wall. Example of the sand transport around other obstacles are given to show the flexibility of the model and its usefulness for such engineering applications.

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