CAJ | 학술논문

内孤立波是陆架陆坡区一种常见的现象.借助于一个2层非静力近似模式(Gerkema)模拟分析了内孤立波在陆架生成及传播特性,并与已有的观测资料进行了比较分析.结果表明,正压潮与地形相互作用激发生成内潮,内潮在向岸传播过程中,由于正压潮流及自身的非线性作用而发生分裂,受频散作用的影响进一步演化成内孤立子波列.而对于离岸传播的内潮,由于较强的频散效应,非线性与频散在较大尺度上达到平衡,从而使得波形呈现椭圆余旋波的特征.
내고립파시륙가륙파구일충상견적현상.차조우일개2층비정력근사모식(Gerkema)모의분석료내고립파재륙가생성급전파특성,병여이유적관측자료진행료비교분석.결과표명,정압조여지형상호작용격발생성내조,내조재향안전파과정중,유우정압조류급자신적비선성작용이발생분렬,수빈산작용적영향진일보연화성내고립자파렬.이대우리안전파적내조,유우교강적빈산효응,비선성여빈산재교대척도상체도평형,종이사득파형정현타원여선파적특정.
Intense internal waves are common phenomena on mid-latitude continental shelves when the water column is stratified. In this paper, a nonlinear nonhydrostatic two-layer model is used to examine the details of the generation and evolution of these waves. This model indicates that the internal waves are generated by the interaction of the barotropie tide with the shelf break topography. The onshore flow of the tides causes an upward displacement of isopycnals. This disturbance splits into a pair of counter propagating waves. The subsequent offshore flow causes a downward displacement which acts in conjunction with advection to steepen the back face of the onshore propagating wave. Thus an internal onshore propagating shock is developed, which eventually disintegrates into a packet of solitary internal waves (SIW) through a process of nonlinear self-interaction. Meanwhile, the model results are compared with available experiment data.