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本文对澳大利亚悉尼外海陆架区上历时9天的浅海锚系海流计资料作了谱分析。得出,观测得到的脉动可能是内波,其低频分量以相速0.55m/s垂直于等深线向岸传播。不同于大洋内波谱特性,观测得到的温度谱呈ω~(-3/2)律,并在ω=N处有急剧下降,而水平动能谱在低频段呈ω~(-5/2)律,在高频段呈ω~(-4/8)律。观测得到内波的总能量约为GM谱的1/2,可以认为上述与GM谱之偏离是由于从远处传入之内波的耗散,浅海局地生成的内波以及细结构污染等因素所致。
In this paper, the spectral analysis of shallow sea moorings on a 9-day shallow sea shelf on the Outer Sea shelf area of Sydney, Australia was conducted. It is concluded that the observed pulsation may be an internal wave whose low frequency component propagates perpendicularly to the isobath toward the shore at a phase velocity of 0.55 m / s. Different from the oceanic spectra, the observed temperature spectrum shows the ω ~ (-3/2) law and sharply decreases at ω = N, while the horizontal kinetic energy spectrum exhibits the ω ~ (-5/2) law at low frequencies , In the high frequency was ω ~ (-4/8) law. The observed total energy of the internal wave is about 1/2 of the GM spectrum, and the above deviation from the GM spectrum can be considered as the dissipation of the internal wave introduced from afar, the internal wave generated by the shallow sea, and the fine structure pollution Due to factors.