Sinuosity-driven hyporheic exchange in meandering rivers

A model for the evaluation of the intra- meander hyporheic exchange fluxes is presented. The method relies on a physically- based morphodynamic model to predict the characteristics of the flow field in a meandering river and the temporal evolution of its planimetry. The hyporheic fluxes induced at the meander scale by the river sinuosity can therefore be computed. The application of the model to a simulated case has shown the fundamental role of the river planimetry on the hyporheic exchange pattern at the meander scale, and its influence on the long- term evolution of the hyporheic exchange.