HR: 17:30h
AN: H34C-07    [Abstracts]
TI: A Combined Wind Wave-Tidal Model for the Venice Lagoon, Italy
AU: * Carniello, L
EM: carniello@idra.unipd.it
AF: Department IMAGE University of Padova, Via Loredan 20, Padova, 35131 Italy
AU: * Carniello, L
EM: carniello@idra.unipd.it
AF: Department of Geological Sciences and School of Computational Science Florida State University, Dirac Science Library, Tallahassee, FL 32306-4120 United States
AU: Defina, A
EM: defina@idra.unipd.it
AF: Department IMAGE University of Padova, Via Loredan 20, Padova, 35131 Italy
AU: Fagherazzi, S
EM: sergio@csit.fsu.edu
AF: Department of Geological Sciences and School of Computational Science Florida State University, Dirac Science Library, Tallahassee, FL 32306-4120 United States
AU: D'Alpaos, L
EM: dalpaos@idra.unipd.it
AF: Department IMAGE University of Padova, Via Loredan 20, Padova, 35131 Italy
AB: A numerical model that combines wind waves with tidal fluxes in a tidal basin is presented and validated. The model couples a hydrodynamic finite element module based on the shallow water equations with a finite volume module that accounts for the generation and propagation of wind waves. The wave module solves the wave action conservation on the same triangular mesh used in the hydrodynamic module, thus correctly reproducing the physical relationships between waves and tide propagation. The combined wind wave-tidal model is applied to the Venice lagoon, Italy. The highly irregular bathymetry of this intertidal environment, characterized by deep channels, emergent salt marshes, and extensive tidal flats, suggests the introduction of ad hoc hypotheses that simplify the governing equations with a noteworthy increase in efficiency and robustness of the algorithm. Particular attention is devoted to the dissipation of wave energy at the steep boundaries between channels, tidal flats, and salt marshes. Simulations of wave fields generated under specific wind conditions are presented and discussed. The model results are compared, with good agreement, to field data collected in two different stations inside the lagoon of Venice. Finally, evidence of the complementary effect of tidal currents and wind waves on sediment resuspension is presented using the results of different simulations.
DE: 4235 Estuarine processes
DE: 4255 Numerical modeling
DE: 4546 Nearshore processes
DE: 4560 Surface waves and tides (1255)
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting