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主要利用地震海洋学方法研究了南海东北部东沙海域内孤立波的结构特征,内孤立波的类型是第一模态下沉型,最大振幅有85.5 m.内孤立波自最大振幅所处深度向下,其振幅大体呈线性减小趋势,振幅随深度的减小率为0.2左右.海底对内孤立波的波形会产生一些影响,一方面海底可能会“切割”内孤立波底部,使之出现间断,另一方面海底的“摩擦”会导致近海底的内孤立波处会发育有较多次一级尺度的波动.横向上看,由地震剖面所得到的内孤立波视宽度,需经过一定的校正才能获得真实宽度,本文所研究的两个内孤立波视宽度分别是4.52和3.36 km,校正后的宽度为0.5~3 km.另外内孤立波处存在的垂向噪音反映出内孤立波具有很强的垂向剪切力.内孤立波水平波数谱与GM模型谱的对比研究表明,其能量在低波数段比GM谱大两个数量级左右.
The seismo-oceanographic method is mainly used to study the structural characteristics of solitary wave in the Dongsha sea area in the northeastern South China Sea. The type of internal solitary wave is the first mode subsidence with a maximum amplitude of 85.5 m. , The amplitude tends to decrease linearly with the rate of amplitude decreasing by about 0.2. The seabed will have some influence on the wave shape of the solitary wave in the sea. On the one hand, the seabed may ’cut’ the bottom of the solitary wave so that On the other hand, the “friction” of the seabed will lead to more fluctuation of the first order scale at the inner solitary wave near the seafloor.In the horizontal view, the width of the inner solitary wave obtained from the seismic profile , A certain correction is needed to get the true width. The two isolated wave widths studied in this paper are 4.52 and 3.36 km respectively, and the corrected width is 0.5-3 km. In addition, the vertical noise reflected in the inner solitary wave The out-of-band solitary wave has a strong vertical shear force.The comparison between the internal solitary wave horizontal spectrum and the GM model shows that the energy is about two orders of magnitude larger than the GM spectrum in the low-wave period.