渤、黄、东海潮汐、潮流的数值模拟与研究

NUMERICAL STUDY ON THE TIDES AND TIDAL CURRENTS IN BOHAI SEA,YELLOW SEA AND EAST CHINA SEA

基于FVCOM海洋数值模式,采用高分辨率的三角形网格,对渤、黄、东海的潮汐、潮流进行数值模拟,并通过比较120个沿岸验潮站和14个潮流观测站的实测与模拟结果进行模型验证,两者符合较好。根据模拟结果,给出了四个主要分潮的潮汐同潮图和5m层潮流最大流速及最大潮流同潮时分布。渤、黄、东海共有5个半日分潮和3个全日分潮的独立旋转潮波系统,且都呈逆时针方向旋转;半日潮流和全日潮流各有12个圆流点;在冲绳岛和奄美岛两侧的4个半日潮流圆流点分别呈对称分布,其中有3个为本文首次给出;在日本九州岛西侧还新给出2个全日潮流圆流点。有关它们的存在性需要实测资料的进一步检验。

A successful simulation for the tides and tidal currents has been done based on the Finite Volume Coastal Ocean Model （FVCOM） with unstructured triangle grids in high resolutions in Bohai Sea, Yellow Sea, and East China Sea. The numerical model agreed with the observation well by comparing the observed data with the simulation results from 120 gauge stations and 14 tidal currents stations. The distributions of the co-tidal charts, maximum velocity and co-range charts when maximum velocity occurs of the tidal currents in 5 meter layer are shown in this paper according to the model results, respectively. Model results indicate that five semidiurnal and three diurnal constituents independent rotary tidal systems appear in Bohai Sea, Yellow Sea, and East China Sea, and they are all anti-clockwise; twelve tidal cur- rent-amphidromic points for semidiurnal and diurnal constituents can be found, respectively; the four semidiurnal tidal current-amphidromic points located at the two sides of the Okinawa Island and Amami Island are symmetry, three of them are reported at first time; two diurnal tidal current-amphidromic points located in the west of Kyushu Island of Japan are reported at first time, too. But the existence of them should be validated by observation.