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The linear mixing length profile lm = κz classically used, does not allow to obtain the logarithmic profile of the velocity observed in experiments, and its validity is limited to the fields of low roughness (boundary conditions of the type ’ smooth bed ’). In the present paper, we propose three types of mixing length profiles lm(z) as well the associated mixing velocities. The obtained results are tested on academic cases and compared with experimental results of filling of an extraction pit resulting from the tests presented in the European project Sandpit.

Simulations numériques de l’évolution des fonds et effet du mélange turbulent sur le transport sédimentaire : Application au remplissage d’une fosse d’extraction