FVCOM在龙口海域潮汐潮流模拟中的应用研究

Application of FVCOM in tidal modeling of the seas adjacent to Longkou City

利用不规则三角网格和有限体积方法的FVCOM(finite-volume coastal ocean model)模式,建立了高分辨率的龙口海域三维潮汐潮流数值模型,模式结果与实测结果吻合良好。根据计算水位和流速得到了精细的龙口海域M2,S2,K1,O1分潮的同潮图、潮汐潮流类型分布图和潮流椭圆分布图等。结果显示,龙口海域潮汐类型主要为不规则半日潮;屺姆岛以北海域多为往复流而龙口湾内同时存在旋转方向不同的旋转流;最大可能流速分布与岸线和等深线几乎平行,最大值出现在桑岛南侧的狭窄水道;该海域的潮汐余流极大值出现在屺姆岛的西侧,余流流速可达25 cm/s。该结论对于了解龙口海域的动力过程具有重要意义。

With the application of FVCOM（finite volume coast and ocean model）, a high resolution of three-dimensional tidal model of the seas adjacent to Longkou City was built, and the model results were conformable to the field observations. Based on the calculated tidal level and current, the distributions of co-tidal lines, distributions of tidal characteristic, and distributions of the tidal current ellipses of M2, S2, K1 and O1 were obtained. The results showed that, the main tidal characteristics in the study area were mixed semidiurnal tide; On the north of the Qimu Peninsula the rectilinear current dominated, while in the Longkou Bay the rotary current dominated with both clockwise and anticlockwise directions; the distribution of the maximum possible current velocities was basically the same as that of isobaths, and the maximum possible current velocity was especially higher on the south of Sang Island; the tidal maximum residual current appeared on the west of the Qimu Peninsula, and the residual current velocity there could reach 25 cm/s. These results are very useful for the understanding of the mechanical processes in the seas adjacent to Longkou City.