A Numerical Simulation Study on Eight Maj or Tidal Components in the Bohai Sea,the Yellow Sea and the East China Sea

SONG Ze-kun; YU Liang-liang; XIANG Yun-yun; SHI Wei-yong; XU Xue-feng; YANG Wan-kang; PAN Chong

doi:10.3969/j.issn.1002-3682.2016.01.002

Abstract：A high resolution grid model is established for the calculated areas including the Bohai Sea,the Yellow Sea,the East China Sea,the East China Sea continental shelf and the Ryukyu Islands by using the MIKE software and a nonstructural triangular mesh,in which the actual water depth and shoreline are considered and the open bound-ary is resulted from the comprehensive Northwest Pacific tidal model.Based on this model,the tidal wave processes in the China seas are simulated,a harmonic analysis is made for the vertical motion processes of the tidal waves and thus the propagation and distribution characteristics of eight tidal components like M2 ,S2 ,K1 ,O1 ,N2 ,K2 ,P1 and Q1 in the Bohai Sea,the Yellow Sea and the East China Sea are obtained.The re-sults from the model have been validated by using the harmonic constants of 14 tide sta-tions located along the coast of China,indicating that the model is more accurate and re-liable.The research results show that the propagation of the 4 maj or semidiurnal tides (also the diurnal tides)are similar in the above seas,that means,the propagation prop-erty of the tidal waves along the coasts of the above seas is similar to that of the coastal Kelvin Wave.Moreover,4 amphidromic points of the semidiurnal tide component and 2 amphidromic points of the diurnal tide component in the calculated areas are reproduced successfully.The diurnal tidal amplitude is minimal around the amphidromic points and maximal at the free zone of the bay.The tidal range amplitude is large towards the coast and small towards the sea in the East China Sea.It is large along the coasts of Zhej iang and Fuj ian and relatively small in the Yellow Sea.In the Bohai Sea,it is maximal at the tops of the Bohai Bay and the Liaodong Bay and smaller in the area around the two am-phidromic points of the diurnal tide component.