基于EFDC模型的胶州湾三维潮流数值模拟

Numerical Simulation of 3D Tidal Currents Based on the EFDC Model in Jiaozhou Bay

基于环境流体动力学模型(EFDC),采用变边界处理技术,建立了胶州湾三维变边界潮流模型。模型平面采用笛卡尔直角坐标,垂向采用σ坐标变换,利用干湿网格方法模拟胶州湾潮流漫滩过程。研究海域水平流速从表层到底层逐渐衰减,最大流速出现在胶州湾湾口,值为0.98 m.s-1。垂向流速则表现出底层大、表层小的特点,最大流速为30×10-4m.s-1。模型计算结果与实测资料吻合良好,为潮流数值模拟研究提供了1种新的模型工具。

Based on the Environmental Fluid Dynamics Code（EFDC） with a moving-boundary approach, a three dimensional hydrodynamic model has been developed and applied to Jiaozhou Bay. The hydrodynamic model uses the Cartesian coordinates in the horizontal direction and the sigma coordination transformation in the vertical direction. The wetting and drying approache is used to treat the tidal flood-ebb in tidal flat areas. The value of horizontal velocity decreases with depth. The maximum horizontal velocities of around 0.98 m·s^-1 occur at the bay mouth at the middle of the flooding and ebbing periods. The vertical velocity in the surface layer is samller than that in the bottom layer, the maximal velocity being ca 30×10^-4m·s^-1. The model result match the observations reasonably well and show well the temporal and spatial distributions of M2 tidal current. The model presented in this paper can be a new useful tool for studying environmental numerical simulation.