Modelagem morfodinâmica do transporte de sedimento de fundo em ambientes costeiros

Abstract

The sediment transport in coastal aquatic environments depends heavily on the local hydrodynamics, which is forced by the astronomical and weather tide, waves, and the intensity and wind direction. Actions planned or unplanned in these environments can bring erosion problems affecting the buildings on the coastal shore, tourism, recreation, shipping operations in ports, among others. This work is carried out to study the morphodynamic changes induced by surface waves. The wave model is linear and of shallow water type, which considers the effect of friction with the bed. Without loss of generality, the transport of suspended sediment is not considered. For the morphodynamic changes in the bed, it is considered the conservation equation of sediment volume in the bed level. Initially, different finite difference schemes have been implemented to solve the equation for the transport of sediment (morphological variation of coastal bottom) subjected to a uni-directional flow. The obtained results showed that the Warming-Beam scheme, used to discretize the equation of sediment transport, was best represented the analytical solution. The morphodynamic model was coupled to the linear model of wave-type shallow water. In the analyzed results, there was a harmonic bank sediment increases with increasing wave period.