M.R. Rafiee, R. Aghamajidi
One of the most important issues related to the rivers is the river erosion in meander location, especially the river beach erosion in the outer bend, that the main reason for that is the existence of secondary streams. The existence of this issue affects the morphology of the river. In this research, using the CCHE2D numerical model, the sediment hydraulic simulation of the Maroon River has been performed and the effect of water speed in the river on the erosion of the river bend, especially the outer bend, and, the utilization of groin on the Maroon River has been investigated as a proposal. The results of this research show that, during the seasonal floodwater and increase of the discharge, the outer beach of the river bend will be eroded and destroyed that this phenomenon could be controlled by the installation of the groin. The installation of groin in the outer bend decreases the shear stress of the river bed by decreasing the flow discharge; therefore, results in the erosion prevention in the outer bend and as a result the beach fixation.