Abstarct: In this research, the level of riverbed scour, formation of a resistant laxyer, and final aggregation of surface and substrate of the bed were measured using a numerical model prepared by coding in excel software with the programming language of visual basic (VB). Equations governing the sediment transport process consist two hydrodynamic and morphodynamic models. The hydrodynamic, which encompasses continuity and conservation momentum equations, is applied to estimate the flow-dependent components. On the other hand, the morphodynamic model includes equations related to the sediment transport process. Hydraulic parameters in combination with hydrodynamic and morphodynamic equations are used in code writing. Given the application of the finite difference method in the present study, the governing equations were coded in VB programming language after discretization and determination of coefficients. Finally, the numerical results obtained were compared using two laboratory models, followed by assessing the accuracy of results. In this research, we first confirmed the accuracy of numerical flow modeling by two laboratory tests. Afterwards, the numerical modeling was carried out when the sediment entered at the beginning of the channel was more than the sediment that could be transferred by the flow. In this regard, appropriate results were shown baxsed on reality. In the next stage, the amount of the sediment entering the canal was considered lower, compared to the sediment that could be transmitted by the current, which led to the presenting suitable numerical modeling for sedimentation in the canal. In the end, the long-term sedimentation model was applied, which led to the presenting of a laxyer resistant to downstream by the model. It is suggested that this laxyer be used in the downstream of dams to prevent scour in this area and the demolition of downstream buildings.