基于FVCOM的强潮海湾三维潮流数值模拟

3D numerical simulation for tidal flow in macro-tidal bay based on FVCOM

采用三维非结构网格、有限体积的河口、陆架和海洋模型FVCOM模拟强潮海湾三门湾的三维水动力特征.模拟研究表明:FVCOM模型能很好地用于类似三门湾这样的具有复杂岸线、地形、多汊道的强潮海湾;由于垂向混合较强,三门湾表、底层的流场及余流场结构基本一致;受大柴门、田湾山诸岛复杂岸线、地形影响,大柴门、田湾山诸岛连线以西诸水域,余流总体上指向东南向外海;大柴门、田湾山诸岛连线以东至花岙岛的满山水道水域,余流呈顺时针环流结构,最终沿石浦水道净泄入海;FVCOM模型的干湿判别功能基本能较好地反映涨落潮过程中强潮海湾的滩地出露特征.

Based on the unstructured-grid and finite-volume coastal ocean model（FVCOM）,a 3D tidal flow model of macro-tide bay,Sanmen Bay,is built.The model research results indicate： the unstructured triangular grids can fit the irregular coastal boundary and complicated bottom topography very well;the finite volume model can be suitably applied to model the 3D flow of macro-tide bay;because of the strong vertical mixing of 3D tidal flow,there is little difference between surface and bottom water body′s current structure and residual current structure;under the influences of the irregular boundary and complicated bottom topography of Dachaimen and Tianwanshan island,the residual current in the western area of Dachaimen and Tianwanshan island flows to the southeast,whereas the residual current in the eastern area of Manshan channel flows to Shipu channel clockwise and then flows to the outer sea;the wet/dry treatment technique of FVCOM can simulate the tide′s flooding onto and draining out of the inter-tidal zone.