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) W_Tide (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,AΔū + BΔū=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:φ₁=Arctg (A/B),C₁=1/(H₀·√A²+B²).
The calculated results agree,in the main,fairly well with two sets of observations at station L₃.