粤东甲子海域潮波异常和南海北部潮波的传播

Traveling of tidal wave in the north part of the South China Sea and the tidal energy divergence appearing in the area off Jiazi Station

从南海潮波数值模拟潮能通量的结果中,勾勒出南海北部潮波的传播路径,显示出众多的路径分支。分析表明南海北部陆架包括北部湾海区,仅获得太平洋传入潮能的一小部分,因而南海北部沿岸的潮汐潮流都表现得比较弱。由于复杂的地形,导致了潮波传播路径指向不同方向。文章通过实测资料以及潮波的传播路径,特别讨论了粤东甲子站附近的潮波异常现象,并指出流向台湾海峡南口的分支和流向珠江口、广州湾的分支之间的潮能辐散,可能是造成甲子站附近潮性系数特别大以及潮汐潮流性质迥异现象的重要原因之一。

The traveling route of tidal wave in the north part of the South China Sea is sketched from the numerical modeling result of the tidal energy flux,which shows several branches. Analysis indicates that the continental shelf area in the north part of the South China Sea including the Beibu Gulf,gets only a small part of tidal energy coming from the Pacific Ocean and passing through the Luzon Strait, and hence the tide and tidal current in that area is weak. The complex topography results in those branches of the traveling route of tidal wave pointing to different directions. In this paper by using the observational data and tidal traveling route analysis the abnormal phenomena of tidal wave in the Jiazi,east Guangdong coast are discussed. These phenomena include specially large tidal charac- teristic coefficient F appearing in that area,and quite different tidal characteristics for tide and tidal current. Analy- sis shows that the tidal energy divergence between the two tidal wave branches traveling to the south entrance of the Taiwan Strait and to the Zhujiang River Estuary as well as Guangzhou Bay might be one of the important rea- sons to cause these phenomena.