Comparison of 2D and 3D Models for Computing Shallow Water Tides in a Friction-Dominated Tidal Embayment

by R. R. Grenier, North Carolina State Univ, Raleigh, United States,
R. A. Luettich, Jr., North Carolina State Univ, Raleigh, United States,
J. J. Westerink, North Carolina State Univ, Raleigh, United States,



Document Type: Proceeding Paper

Part of: Estuarine and Coastal Modeling

Abstract:

The friction related overtide generating mechanisms in 2D and 3D models are compared by investigating shallow water tides in the Bight of Abaco. The 2D and 3D forms of the circulation model ADCIRC are used in the model runs. The results indicate that both the 2D and 3D models give generally similar predictions of the M₆ overtide. Systematic variations in the M₆ tide appear to occur depending on the form of the eddy viscosity and the bottom boundary condition that is used. However, in all cases the modeled M₆ elevation amplitude was at least twice the observed value. Due to the large bed-related bottom roughness and depth limited wave height and period, it appears that wave-current interaction is probably not important in influencing the overall circulation in the bight.

Subject Headings: Three-dimensional models | Two-dimensional models | Tides | Water circulation | Shallow water | Friction | Viscosity

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