Granular front for flow down a rough incline: about the value of the shape factor in depths averaged modelsPierre-Yves Lagrée, Guillaume Saingier, Stéphanie Deboeuf, Lydie Staron and Stéphane PopinetEPJ Web Conf., 140 (2017) 03046DOI: https://doi.org/10.1051/epjconf/201714003046