南黄海非线性内波的数值模拟研究(2)——内潮的非线性演变  

A Numerical Study of Nonlinear Internal Waves in theSouth Yellow Sea(2):Nonlinear Evolution of Internal Tidal Wave

作　　者：司宗尚[1] 范植松[1] 于万春[1] 杜凌[1] 

机构地区：[1]中国海洋大学海洋环境学院,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2011年第5期15-22,共8页Periodical of Ocean University of China

基　　金：国家自然科学基金重点项目(41030855);国家自然科学基金项目(40706055)资助

摘　　要：在本工作的先行部分的基础上,本文中考虑第一模态半日内潮波分别从A站位(34°4′N,125°6′E)和B站位(36°34′N,123°51′E)向西、西南和西北方向的反射和非线性演变过程,使用的数学物理模型为适用于连续层化海洋并且考虑背景正压落潮流与涨潮流不同作用的一般化的KdV模型(简称之为GKdV模型)。模拟结果表明,南黄海的内孤立波集中分布于南黄海的南部,而在其北部极少出现内孤立波的主要原因是在南黄海的南部存在较强的背景斜压环流和很强的背景正压潮流,而且在涨潮时段(相对于朝鲜半岛的西海岸而言)背景斜压环流和背景正压潮流的方向基本相同,而在南黄海的北部这2种背景流都很弱。另外,由于出现高达0.75 m/s的正压潮流,自A站位向西北方向传播的半日内潮波处于不稳定状态。Following the previous work, in this paper the reflection and nonlinear evolution of semidiurnal internal tidal wave for the first mode from Station A （34°4′N,125°6′E） and Station B （36°34′N,123°51′E） in a westward, southwestward and northwestward direction respectively is modeling, by using the generalized KdV model （GKdV model for short） for continuous stratified ocean, in which the different impact between background barotropic ebb and flood current is considered. The results of modeling show that, the main reason that internal solitary waves are collecting in the south of the South Yellow Sea and seldom existing in the north of the South Yellow Sea is the impact of powerful background baroclinic cir- culation and very strong background barotropic current in the south of the South Yellow Sea, and on the flood （relative to the west coast of Korea peninsula） the directions of the two currents are the same basi- cally, otherwise the two currents are weak in the north of the South Yellow Sea. In addition, owing to the impact of very strong background barotropic current of 0. 75 m/s, the semidiurnal internal tidal wave is not stable from Station A in a northwestward direction.

关 键 词：内潮 内孤立波 非线性演变 南黄海 

分 类 号：P731.2[天文地球—海洋科学]