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Based on the shear effect of internal wave currents in stratified fluid, the necessary condition for the possible existence of an internal wave and the sufficient condition under which there will be no internal wave are deduced starting from the continuity equation of incompressible fluid. The above two conditions are verified by the measured results from vertical current meter arraies at some observation stations in the Bohai Sea and the South Huanghai Sea. In the treatment of measured results, first of all, the tidal period components are separated from the measured currents by Fourier-analysis method, and then the internal wave currents of tidal period from the tidal period components in the light of some considerations. The analytical results of observed currents are well consistent with theoretical analysis. Furthermore, one can also deduce some features of internal waves therefrom. Consequently, it is concluded that the observation from a vertical current meter array is an important means to verif 相似文献
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本文基于分层流体中内波流的切变效应,从不可压缩流体的连续方程出发,导出了流体中可能存在内波的必要条件和不存在内波的充分条件,作者利用某些测站海流计垂直阵列的观测结果,对上述条件进行了验证,在观测资料的处理中,首先用福里哀分析方法将实测海流中的潮周期成分分离出来,然后又依据某些考虑将潮周期内波流从实测海流的潮周期成分中分离出来,观测结果与理论分析相当一致,并由此得出内波的一些性质,从而得出结论:海流计垂直阵列的观测资料是检验近海内波的重要手段. 相似文献
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近海潮成内波波包结构的分析 总被引：1，自引：0，他引：1
在文献[1]中,采用波包的观点给出了确定内波包的方向和群速的方法。本文基于1984年7月在L3站所作的87.5小时的观测资料,研究了内波包的结构。结果表明,沿单一方向传播的潮成内波包是不连续的,存在四个波包,其间间以三个噪声区。四个波包的平均传播方向和速度相应为-90°和50cm/s。波包的频率特征与等温线及上、下层平均流的变差流的频谱特性相一致。通过模式对比证明,我们的二层模式与孤立子理论的二层模式的物理意义完全一致,即两者都反映出,在沿波传播的方向上,潮成内波的切变效应与其波幅成正比,不过我们的模式更为适用。 相似文献
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DETERMINATION OF THE DIRECTION AND VELOCITY OF INTERNAL TIDE WAVE BY MEANS OF MEASUREMENTS AT SINGLE STATION 总被引：1，自引：0，他引：1
In this paper, the method for determining the direction and velocity of internal tide wave is proposed. The main points are as follows: (1) starting with the continuity equation of incompressible fluid and taking the isotherm whose balance position is situated in the middle of the thermocline as the interface of two-layer ocean, one can get an equation of variations of average total current in the lower and upper layers; (2) WTide (Z) in the above-mentioned equation is expressed in first-order approximation; (3) the internal tide waves are treated as wave packets. Thus, one finds out a statistical relation, AΔu BΔv =ζ, which correlates the average shear effect caused by the internal tide wave with the isothermal fluctuation. The direction and velocity of the wave can be drawn from the formulae: (((1=Arctg (A/B), C1=1/(H0(A2 B2)~1/2).The calculated results agree, in the main, fairly well with two sets of observations at station L3. 相似文献
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一、引言内波,如果按其周期划分,可以分成短周期内波和潮周期(长周期)内波两类。前者的典型周期介于5—10分钟之间,后者的典型周期约为12小时或24小时。潮周期的内波又叫内潮。这种内波大多数发现于近岸水域。例如 Reid(1956)和 Ce-rsola(1967)在加里福尼亚近海,Keunecke(1971—1972)在挪威的陆坡均发现过这种内潮。通常认为,这种内潮是层化海洋中,主要由于潮流和急剧起伏的海底地形之间的相 相似文献
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本文从不可压缩流体连续方程出发,提出一种确定近海内潮波的方向和速度的方法,并根据单站的海流计阵列及测温链的测量进行了检验。本文限于潮流占主导的近海水域,在强温度层结条件下展开讨论,将海洋分为上、下等温层,层间以其平衡位置位于温跃层中央处的等温线为界,得出下、上层全流平均值的差Δu、Δv,基于潮波是透底长波,Δu、Δv中应不再含潮流成分,WT(z)取一级近似和内潮波按波包处理,得出内潮波引起的切变效应与等温线起伏之间的统计关系式AΔuI+BΔvI=ζ,波向及波速,由φⅠ=arctgA/B,cⅠ=H1H2÷(H(A2+B2)1/2)求得,经L3站两次实测证明:单站测量确定内潮波是可行的,所算出的φⅠ与Slick走向大体一致。 相似文献
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