南海北部流花海域内孤立波特征研究

The characteristics of internal solitary waves at Liuhua in the northern South China Sea

利用南海北部流花海域一套潜标系统2011年4月份的观测数据,通过分析温跃层附近等温线和流场,研究了该区域的内孤立波特征。发现该区域内孤立波主要来源于吕宋岛和富加岛之间的海峡,且产生于当地大潮期,传播方向集中于292°。这些内孤立波主要为a型波,几乎固定出现在每日0时,平均出现时间间隔24h。分析观测期间的最大振幅内孤立波,发现该内孤立波振幅80.9m,传播周期24min,传播速度1.29m·s 1传播方向298°,半波宽度129.4m,出现在21日1时左右,为典型的第一模态下凹型内孤立波。

Using the observed data from a submerged buoy system at Liuhua in the northern South China Sea in April 2011, the characteristics of internal solitary waves （ISWs） have been studied by analyzing the isotherms and current fields near the thermocline. It is found that the ISWs mainly came from the strait between Luzon and Fuga islands, generated during the spring tide period, and that the propagation direction of the ISWs was 292＆#176; mostly. Most of the ISWs were Type a, appeared regularly at 0 o’clock almost everyday, and the average period was 24 hours. In addition, an ISW with the maximum amplitude during the observation was analyzed. It appeared at 1 o’clock on April 21st. It was a typical first-mode depression wave, and its amplitude, period, velocity, direction and half wave width were 80.9 m, 24 min, 1.29 m·s-1, 298°, and 129.4 m, respectively.