南海北部内孤立波绕东沙岛传播特性的数值研究
发布时间：2018-08-23 11:33
【摘要】：使用三维非静压环流模式MITgcm探究生成于吕宋海峡并向东沙岛传播的内孤立波。模式结果再现了东沙岛附近内孤立波的垂向振幅变化和到达时间。在不同纬向断面中,经向不对称的等密线起伏表现出内孤立波在南海的三维性特征。东沙岛附近的海表高度梯度变化表明,内孤立波在绕过东沙岛后,分离为2个短波峰线内波,此后两者相互作用。内孤立波在大陆坡浅化过程中相速逐渐减小,并与具有半日周期的理论线性相速度吻合一致。内孤立波与东沙岛碰撞后,在岛东北部会出现反射信号。本文利用斜压潮能通量,分析了反射能与入射之比在大潮期与小潮期的差异,发现小潮期的比值大于大潮期。选取东沙岛附近的3个站点,其垂向振幅表明A波与B波在大小潮转变时有不同的变化特征。在东沙岛西部和西北部的两个站位(WB和WN),A、B波均能被显著观测到;但在东沙岛南部站位(WS)只能观测到振幅具有正弦变化趋势的B波信号。
[Abstract]:The internal solitary waves generated in the Luzon Strait and propagated to Dongsha Island are explored by using a three-dimensional non-hydrostatic circulation model (MITgcm). The model results reproduce the vertical amplitude variation and arrival time of solitary waves near Dongsha Island. In different zonal sections, the meridional asymmetrical isodilinear fluctuations exhibit the three-dimensional characteristics of internal solitary waves in the South China Sea. The variation of sea surface height gradient near Dongsha Island indicates that the internal solitary waves are separated into two short-wave peaks after bypassing the Dongsha Island and then interact with each other. The phase velocity of the internal solitary wave decreases gradually during the shallowening of the continental slope and is consistent with the theoretical linear phase velocity with half-day period. After the internal solitary wave collides with Dongsha Island, the reflected signal will appear in the northeast of the island. Based on the baroclinic tide energy flux, the difference of the ratio of reflection energy to incidence in the spring tide period and the low tide period is analyzed. It is found that the ratio of the low tide period is larger than the spring tide period. The vertical amplitudes of the three stations near Dongsha Island indicate that wave A and wave B have different variation characteristics during tidal transition. Two stations (WB and WN) in the west and northwest of Dongsha Island can be observed significantly, but only B wave signals with sinusoidal amplitude can be observed in (WS) at the southern station of East Sha Island.
【作者单位】： 中国海洋大学海洋与大气学院;
【基金】：国家自然科学基金项目(41276008) 泰山学者计划项目资助~~
【分类号】：P731.24
本文编号：2198959
[Abstract]:The internal solitary waves generated in the Luzon Strait and propagated to Dongsha Island are explored by using a three-dimensional non-hydrostatic circulation model (MITgcm). The model results reproduce the vertical amplitude variation and arrival time of solitary waves near Dongsha Island. In different zonal sections, the meridional asymmetrical isodilinear fluctuations exhibit the three-dimensional characteristics of internal solitary waves in the South China Sea. The variation of sea surface height gradient near Dongsha Island indicates that the internal solitary waves are separated into two short-wave peaks after bypassing the Dongsha Island and then interact with each other. The phase velocity of the internal solitary wave decreases gradually during the shallowening of the continental slope and is consistent with the theoretical linear phase velocity with half-day period. After the internal solitary wave collides with Dongsha Island, the reflected signal will appear in the northeast of the island. Based on the baroclinic tide energy flux, the difference of the ratio of reflection energy to incidence in the spring tide period and the low tide period is analyzed. It is found that the ratio of the low tide period is larger than the spring tide period. The vertical amplitudes of the three stations near Dongsha Island indicate that wave A and wave B have different variation characteristics during tidal transition. Two stations (WB and WN) in the west and northwest of Dongsha Island can be observed significantly, but only B wave signals with sinusoidal amplitude can be observed in (WS) at the southern station of East Sha Island.
【作者单位】： 中国海洋大学海洋与大气学院;
【基金】：国家自然科学基金项目(41276008) 泰山学者计划项目资助~~
【分类号】：P731.24
【相似文献】
相关期刊论文 前2条
1 林镇国;罗森波;梁健;;东沙岛海域近56a热带气旋影响统计分析[J];台湾海峡;2007年04期
2 ;[J];;年期
相关重要报纸文章 前1条
1 陆儒德;东沙群岛缘何静悄悄[N];中国海洋报;2013年
，本文编号：2198959
本文链接：https://www.wllwen.com/kejilunwen/haiyang/2198959.html
