Three-dimensional Trend Of The Numerical Model And Its Applications

In order to develop and utilize the ocean, its hydrodynaraic conditions have to be studied first. In estuary and coastal seas, tidal flow is a basic hydrodynamic factor, which affects other substance transport remarkably. In the coastal and near-shore engineering and the environment engineering, the tidal flow field should be studied in detail. The numerical simulation is an effective method.The main task of this dissertation is to establish a three-dimensional numerical tidal model based on the three-dimensional tidal governing equations. By comparing the case studies with analytical solution, the accuracy of the model has been verified. After simulating the tidal flow around Dalian Bay and Hiroshima Bay, the accuracy and the adaptability to complex topography has been verified further.(l)The three-dimensional equations for tidal flow are derived from the Navier-Stokes equations based on some assumptions. The model is based on the Vincenzo Casulli method, and semi-implicit finite difference scheme has been used. The model is accurate and of great efficiency.(2)A numerical experiment concerned with the 3-D unsteady flow in a rectangular channel driven by tidal forcing at the open boundary has been done. By comparing the result with the analytical solution, the accuracy of the model has been verified. (3)The tidal flow around Dalian Bay has been simulated and discussed.The accuracy of the model has been verified further. (4)The tidal flow around Hiroshima Bay has been simulated and discussed. The accuracy and adaptability to complex topography of the model has been verified.