基于FVCOM的福建连江海域潮汐潮流数值模拟-海洋预报

基于FVCOM的福建连江海域潮汐潮流数值模拟

单位：1. 国家海洋环境预报中心, 北京 100081;

2. 浙江海洋大学, 浙江舟山 316022;

3. 南方海洋科学与工程广东省实验室(珠海), 广东珠海 519000

分类号：P731.2

出版年·卷·期（页码）：2022·39·第六期（1-12）

摘要：

基于非结构三角形网格的海洋模式FVCOM，建立了福建连江海域三维潮汐潮流数值模型。通过与观测潮位和实测潮流数据进行对比，发现模拟结果可以较好地反映连江海域潮汐和潮流的时空分布情况，在此基础上对潮汐、潮流和潮余流的特征进行分析。结果表明：该海域潮汐类型为规则半日潮；潮波主要为逆时针旋转的驻波，在海湾表现出前进波的特点；最大可能潮差由开边界向近岸逐渐增大，在湾顶达到最大。连江海域以北的潮流类型属于规则半日潮流，以南属于不规则半日潮流；潮流在近岸和海湾表现为往复流，在兴化湾和平潭等海域表现为旋转流；潮余流整体偏小，在苔菉镇等岬角地形处形成流速较大的离岸流，离岸流左右两侧分别为逆时针和顺时针涡旋。

Based on the unstructured triangular mesh ocean model FVCOM, a three-dimensional tide and tidal current numerical model of Lianjiang sea area in Fujian Province is established. Compared with the measured tidal level and the sea current data, the simulation results can well reflect the temporal and spatial distribution of tides and tidal currents in Lianjiang sea area. On this basis, we analyze the characteristics of tides, tidal currents and tidal residual currents. The results show that the sea area belongs to regular semidiurnal tide type. The tide wave is mainly standing wave rotating counter clockwise, and shows the characteristics of forward wave in the bay. The maximum possible tidal range gradually increases from the open boundary to the nearshore, and reaches the maximum at the top of the bay. The tidal current in the north of Lianjiang sea area belongs to regular semidiurnal tidal current, while the tidal current in the south belongs to irregular semidiurnal tidal current. The tidal current is reciprocating in the nearshore and the bay, while it is rotating in sea areas of Xinghua Bay and Pingtan. The tidal residual current is small as a whole, and the offshore flow with high velocity is formed in the headland terrain such as Tailu Town with cyclonic and anticyclonic eddies on the left and right side of the offshore flow, respectively.

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