A model to predict reservoir sedimentation

Abstract

Abstract An efficient mathematical model to predict the sedimentation process in a reservoir is presented. It is based on a parabolized and laterally integrated form of the governing equations. For its numerical solution the finite element method is used. The model formulation and numerical scheme are both explained. The model is validated through comparisons with empirical curves that quantify sedimentation in a reservoir. The velocity and sediment concentration profiles in typical situations are shown. Solid discharge longitudinal evolution, as well as stratification conditions, are studied. The formation and growth of bottom structures are explained. It is shown that the reservoir bottom evolution depends strongly on the geometry of the reservoir and the sediment size. It is also shown that the system acts as a filter for the coarse and fine fractions of the solid discharge.