中文摘要：

模型采用二维三角形网格、三维四面体网格的非结构网格形式,利用有限体积法离散控制体积内积分后的控制方程。通过求解沿水深积分方程作为外模式计算水位,垂向采用σ坐标系简化表面和底部边界条件,求解三维浅水运动控制方程,计算流速垂向分布。将模型用于崖门水道三维潮流场的计算,利用实测资料对计算结果进行了验证,并对该潮汐河口水动力流场分布及控制因素进行了分析探讨。

英文摘要：

Two-dimensional triangular grids and three-dimensional tetrahedral grids were applied in the model. The finite volume method was used to discrete the integral form of the governing equations. Since these integral equations can be solved numerically by flux calculation over an arbitrarily-sized triangular mesh, the finite-volume approach is better suited to guarantee mass conservation in both the individual control element and the entire computational domain. The model computes the tide level as the external mode through solving the integral equations, predigests surface- and bottom-conditions using vertical O＂-coordinate, and computes the vertical velocity profile through solving the three-dimensional equations. The three-dimensional tide current of the tidal channel is calculated, and then the results were validated with the measured data.The flow field distribution and controlling factors of tidal current were analyzed and discussed.