基于FVCOM的辽东湾潮汐潮流数值模拟

NUMERICAL SIMULATION OF TIDES AND TIDAL CURRENTS IN LIAODONG BAY BASED ON FVCOM

本文基于有限体积海洋数值模式FVCOM,对辽东湾潮汐潮流进行数值模拟,得到了辽东湾的最大可能流速分布以及M2、S2、K1、O1分潮的潮流椭圆分布和潮致余流分布等,计算结果与实测资料符合较好。结果显示,辽东湾潮汐类型为不规则半日潮,潮流类型为规则半日潮流;最大可能流速的分布受水深和岸线等因素的影响,辽河口东侧最大可能流速达140cm/s;辽东湾顶部余流速度较大,在盖州滩以东水道M2分潮潮致余流最大流速达9cm/s,在盖州滩东南侧存在1个逆时针的余流涡,是控制辽河口径流携沙分布的重要动力要素。

Based on the finite-volume ocean numerical model FVCOM, the tide and current in Liaodong Bay are simulated numerically. The distributions of maximum probable current ve- locities, distributions of the tidal current ellipses and distributions of residual currents of M2, S2, O1, and K1 were obtained. The numerical simulation results are in good agreement with the observation data. The simulation results show that the tide of Liaodong Bay is mainly irregular semidiurnal and the tidal current is mainly regular semidiurnal. The distri- butions of maximum probable current velocities were influenced by the water depth and shoreline, and the maximum probable current velocity was 140 cm/s on the north of Liaohe Estuary. The residual current velocity was larger at the end of the Bay, and it could reach 9cm/s on the north of Gaizhou Beach. There is a counterclockwise residual current vortex on the southeast of Gaizhou Beach, and it is the important dynamic factor for the distributions of sands in Liaohe Estuary.