Numerical Simulation With Finite Elements Method In The Bohai Sea, The Yellow Sea And The East China Sea

In tidal research fields, finite elements model, which can fit boundaries better and control mesh density at will, is better than finite deference model, because there are important impacts of the boundary and topography on tidal system.A finite elements modell UODDY model is introduced in this paper. Its characteristics, principles and solution methods are described in details in this paper. It is the first time to apply three-dimensional finite elements method to simulating tidal system in the Bohai Sea, the Yellow Sea and the East China Sea. Some parameters are got based on both foregone research achievements and many numerical simulation experiments. According to the comparison of the numerical results and observed data, it is proved that the finite elements model can simulate the tidal system well in the areas.Based on the numerical results, characteristics of the tidal system are analyzed in this paper, such as tidal types, tidal elevation, tidal current, vertical structure of tidal current and tidal residuals. Comparison with foregone work, the results of this paper can validate some conclusions. And there are some new discoveries in this paper. There are fifteen rotating tidal system of M1 in the areas. A new current-amphidromic point of K, constituent is discovered in the northern part of the Yellow Sea, and another is discovered at the Southeast of Cheju Island.