基于FVCOM的台湾海峡三维潮汐与潮流数值模拟研究

发布时间：2019-04-28 08:15

【摘要】：基于FVCOM海洋数值模式,采用非结构三角形网格较好地刻画了台湾海峡复杂的岸线边界及海底地形,建立了台湾海峡的三维潮汐潮流数值模型.模拟结果同长期观测资料符合良好,较好地反映出台湾海峡内潮汐、潮流运动的变化状况和分布特征,利用T_tide工具包进行水位潮流调和分析给出了M2、S2、K1、O1四个主要分潮的同潮图、表层潮流椭圆分布.分析表明,M2分潮由台湾岛南北两端传入台湾海峡,两支潮波在澎湖—台湾浅滩南缘相遇,呈NE—SW向倾斜,振幅最大值为2.45m,出现在福建省湄洲湾、兴化湾一带.K1分潮潮波由东北向西南传入,并向南海传播,传播方向上右侧振幅较左侧大0.05m.台湾海峡存在一条分潮潮流椭圆率为0的分隔线,该分隔线大致呈NE—SW走向,分隔线上半部分潮流椭圆旋转方向为逆时针方向,下半部分为顺时针方向.四个主要分潮潮流椭圆长轴基本呈NE—SW走向,但在台湾浅滩表层潮流椭圆长轴方向为NW—SE向,澎湖水道呈N—S向.台湾浅滩处四个分潮的潮流椭圆均较大,对应的潮流也强,可能受当地水深较浅的影响.
[Abstract]:Based on the FVCOM ocean numerical model, the complex shoreline boundary and seabed topography of the Taiwan Strait are well described by using unstructured triangular meshes, and the three-dimensional tidal current numerical model of the Taiwan Strait is established. The simulation results are in good agreement with the long-term observation data. The variation and distribution characteristics of tidal and tidal movements in the Taiwan Strait are well reflected. The harmonic analysis of water level and tidal current in the Taiwan Strait is carried out by using T_tide toolkit, and the results of M _ 2, S _ 2, K _ 1 are given. O1 the cotidal diagram of the four main tidal components and the ellipse distribution of the surface tidal current. The analysis shows that the M2 component flows into the Taiwan Strait from the north and south ends of Taiwan Island, and the two tidal waves meet at the southern margin of the Penghu-Taiwan Shoal, with a NE-SW tilt and a maximum amplitude of 2.45m, which appears in Meizhou Bay, Fujian Province. In Xinghua Bay, the tidal wave K _ 1 was transmitted from northeast to southwest and spread to the South China Sea. The amplitude on the right side was 0.05m higher than that on the left. There is a separation line with a tidal current ellipse ratio of 0 in the Taiwan Strait. The separation line is approximately NE-SW-trending. The upper half of the separation line rotates counterclockwise and the lower part of the separation line is clockwise. The long axis of the ellipse of the four main tidal currents basically shows the trend of NE-SW, but the direction of the ellipse of the surface tidal current of the Taiwan Shoal is NW-SE, and the direction of the Penghu waterway is N S. The tidal current ellipse of the four sub-tides in the Taiwan shallow beach is large, and the corresponding tidal current is also strong, which may be affected by the shallow water depth.
【作者单位】：厦门蓝海天信息技术有限公司;
【基金】：厦门市科技计划资助项目(3502Z20151224)
【分类号】：P731.23

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