东海黄海渤海8个主要分潮的数值模拟

Numerical Simulation of Eight Main Tidal Constituents in the East China Sea, Yellow Sea and Bohai Sea

应用球面坐标系下ECOM数值模式,数值模拟了东海黄海渤海的8个主要分潮M2、S2、N2、K2、K1、O1、P1和Q1.采用高分辨率网格,计算区域包括东海黄海渤海、东海陆架坡和琉球以东西北太平洋,考虑实际水深和岸线.开边界条件由全球大洋潮汐模式计算的调和常数给出.较成功地模拟出了8个分潮的传播特征,再现了计算区域内半日分潮的5个无潮点和2个蜕化的半个无潮点、全日分潮的3个无潮点.与65个潮位站的观测资料比较,模式计算的M2、S2、K1和O1分潮振幅和位相的均方差分别为7.85cm和6.81°,5.04cm和8.14°,3.82cm和13.04°,4.34cm和9.33°.与17个潮位站的观测资料比较,N2、K2、P1和Q1分潮振幅和位相的均方差分别为3.64cm和7.89°,8.47cm和10.51°,1.76cm和7.56°,1.50cm和26.34°.模式模拟的结果可为河口海岸小区域模式提供较为可靠的外海开边界潮汐调和常数资料.

The 8 main tidal constituents M2 ,S2 ,N2 ,K2 ,K1 ,O1 ,P1 and Q1 in the East China Sea, Yellow Sea and Bohai Sea were numerically simulated using the numerical ECOM model in the sphere coordinate system. The higher resolution grids were designed in the model, the calculated domain includes the East China Sea, Yellow Sea, Bohai Sea, the continental shelf slope of the East China Sea and the Northwest Pacific on east side of the Ryukyu Island, and the real coast and topography were considered. The model successfully simulated the tidal wave propagation features of the eight main tidal constituents in the East China Sea, Yellow Sea and Bohai Sea, reconstructed the 5 nodes and 2 semi-nodes of the semi-diurnal tidal constituents, and 3 nodes of diurnal tidal constituents in the calculated domain. Compared with the observed data at 65 gauging stations, the RAM of modal predicted amplitude and phase of the M2 ,S2 ,K1 and O1 tidal constituents are 7.85 cm and 6.81°, 5.04 cm and 8.14°, 3.82 cm and 13.04°, 4. 34 cm and 9.33°, respectively. Compared with the observed data at 17 gauging stations, the RAM of modal predicted amplitude and phase of the N2 ,K2 ,P1 and Q1 are 3.64 cm and 7.89°, 8.47 cm and 10. 51°, 1.76 cm and 7.56°, 1.50 cm and 26.34°, respectively. The model calculated results can be used for the tidal harmonic constants at open boundary condition of estuarine and coastal model with smaller calculated domain.