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A Coupled Regional Tide Model
NAVAL OCEANOGRAPHIC AND ATMOSPHERIC RESEARCH LAB STENNIS SPACE CENTER MS
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Two dimensional numerical models were used to further study appropriate conditions at the open boundaries for regional models forced by parameters from a global tidal model. The open boundary condition of Reid and Bodine 1968 was applied to regional models of the western Florida shelf, north-central Gulf of Mexico, and the Kenya Coast. In addition, two semienclosed basins were modeled, the Persian Gulf, and the entire Gulf of Mexico. A number of tests were conducted to determine how well forcing, using the tidal constants from the 1 deg by 1 deg Schwiderski global model 1981, 1983 could reproduce regional tides as determined from observations. As seen in our previous work, the Reid and Bodine formulation was quite effective in driving the regional models while still allowing wave energy to propagate through the open boundaries and out of the model. The western Florida shelf is known to resonate with the M sub 2 tide. Under such circumstances, the bottom friction becomes quite important in obtaining correct predictions of the observed tidal amplitudes. Several bottom friction schemes with varying drag coefficients were tested for both the north-central gulf and Florida shelf models. The results are discussed in light of the fact that we seek one scheme that would be applicable for both resonant and nonresonant situations.
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