VERIFICATION OF INTERNAL WAVES IN OFFSHORE AREAS BY MEANS OF CURRENT OBSERVATIONS

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     

利用海流观测资料检验近海内波

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.     

高空变压计算法的建议

Rossby^*在“从局地高空纪录估计天气”一文中引用高空变压与地面变压的关系     

根据基培尔基本假设的天气预报新法

基培尔用了些假设得出局地压力变化的近似公式,他先由“对流项条件”得出局地温度变化公式     

DETERMINATION OF THE DIRECTION AND VELOCITY OF INTERNAL TIDE WAVE BY MEANS OF MEASUREMENTS AT SINGLE STATION

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.     

用单站测量确定近海内潮波的方向和速度

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,W_T(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AΔu_I+BΔv_I=ζ,波向及波速,由φ_Ⅰ=arctgA/B,c_Ⅰ=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φ_Ⅰ与Slick走向大体一致。