正压潮流对南海东北部深水海域大振幅内孤立波影响的数值模拟  

The Impact of Barotropic Tidal Current on the Simulation of Large-Amplitude Internal Solitary Waves in the Deep Sea in the Northeast of South China Sea

作　　者：石新刚[1] 范植松[1] 李培良[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）》2009年第S1期297-302,共6页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(40706055;40506006)资助

摘　　要：分别在由正压涨潮潮流和斜压环流、正压落潮潮流和斜压环流构成背景流场的情况下进行南海东北部深水海域(深水海盆和陆架坡折海域)大振幅内孤立波的数值模拟。分析正压潮流对内波模态结构函数φ(z),GK-dV方程非线性系数α、频散系数β、长内波相速度c、内孤立波振幅和波形的影响。发现正压潮流对φ(z)和β影响较小,而对α和c影响较大。对α的影响随着水深的变浅越来越大,而对c的影响是一致的,且当斜压环流与正压潮流同向时α(绝对值)和c值比较大。同时在诊断模拟内孤立波过程中发现,正压涨落潮潮流对内孤立波主孤立子波形和振幅影响的差别较小,但是对内孤立波的非线性演变过程影响的差别较大。The simulation of large-amplitude internal solitary waves in the deep sea(the sea basin and the continental slope area) in the Northeast South China Sea is made in two conditions: one is that the background current is composed of circulation and flood current,and the other is composed of circulation and ebb current.The impact of barotropic tidal current on internal wave mode structure function φ(z),the nonlinearity coefficient α and the dispersion coefficient β of GK-dV equation,the phase speed c of long internal waves, as well as the amplitude and shape of internal solitary waves are considered.It is found that barotropic tidal current has a small effect on φ(z) and β,but has a great effect on α and c.The effect on α in the shallow sea is larger than that in the deep sea,but on c is consistent.When barotropic tidal current has the same direction as circulation,the magnitudes of α(absolute value) and c are larger.Furthermore the difference of impaction between flood current case and ebb current case on the amplitude and shape of the first soliton is small,but on nonlinear evolution process of internal solitary waves is lager.

关 键 词：正压潮流 内孤立波 数值模拟 南海 

分 类 号：P731.24[天文地球—海洋科学]