苏北灌河口海域三维水动力数值模拟

Three-dimensional Hydrodynamic Modeling of Guanhe Estuary Based on Unstructured Mesh

基于无结构网格海洋模型(FVCOM),建立了灌河口海域三维潮流数学模型。模型水平方向采用三角形网格,使得能够更好地拟合灌河口不规则岸线边界,垂向采用σ坐标。模型计算结果与实测结果吻合良好,较好地模拟了灌河口潮流场时空分布。水平潮流以旋转流为主,流速由北到南逐渐增大,近岸余流方向都是由北向南的沿岸流。灌河口和海州湾的水动力交换主要受潮流驱动,余流漩涡形成的主要机理可能是潮波和地形及岸线的相互作用。

A three-dimensional tidal flow model of Guanhe Estuary is set up based on unstructured grid ocean model（FVCOM）. In order to make it fit the complex irregular coastline boundary better,triangle mesh is adopted in the horizontal direction and the σ？coordinate is used in the vertical direction. The results reveal that the simulated values agree well with the observations. The model is better for simulating the spatial and temporal distribution of the tidal flow in Guanhe Estuary. The horizontal current is dominated by rotational flow,and the velocity increases from north to south. The Euler residual current near shore are coast current from north to south. The hydrodynamic exchange of Guanhe Estuary and Haizhou Bay is mainly driven by currents. The main mechanism of residual eddies may be the interaction of tidal waves with topography and shoreline.