A finite volume model of flow and sediment transport in the lagoon of Grado-Marano

摘要

The Grado-Marano Lagoon in the Northeast of Italy has many problems related to the silting of its navigable channels and hence a study of sediment transport inside the basin is becoming necessary. A finite volume numerical model for simulating solid transport in lagoons is proposed. Of all the different techniques to evaluate the numerical fluxes in the integration scheme, one technique was adopted, that solves a local Riemann problem at each intercell. To choose the most appropriate solver for this kind of problem, a test was developed to simulate the tidal run-up and run-down on a beach. Some results are shown in the paper. The sediment transport was evaluated through the Van Rijn total load formula. Finally the model was used to simulate the oscillations of consecutive tides in the Grado-Marano lagoon and the results are discussed.