A unified framework for simulating various transport processes in the environment is presented. It consists a single set of partial differential equations. The main feature this model its exchange layer, which allows to treat several types transfer between soil and surface water. equations, termed shown reproduce three independently-published models developed erosion, river bedload, chemical re...

Abstract. We formulate the bedload sediment flux probability distribution from Lagrangian dynamics of individual grains. Individual particles obey Langevin equations wherein stochastic forces driving particle motions are switched on and off by entrainment deposition. The is calculated as rate many such crossing a control surface within specified observation time. Flux distributions inherit time...

In the mass balance of a riverbed, some terms are usually assumed constant for reasons of simplicity. One of the terms assumed to be constant is the change in bedload layer, which is defined as the sediment transport divided by the particle velocity. To study the effect of this assumption, a numerical morphodynamic model has to be computed. For such a morphodynamic model to work, some input par...

In this work efficient semi-implicit methods for sediment bedload transport models with gravitational effects under subcritical regimes is proposed. Several families of are presented and rewritten a general formulation that allows us to apply the method. numerical tests we focus on application generalization Ashida-Michiue model, which includes gradient both fluid surface. Analytical steady sta...