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在文[7]中作者在不引进海底摩擦经验公式前提下,直接求解三维运动问题,严格导出了潮波运动方程。在此基础上本文利用谱方法求解了等深渠道中的潮波运动,进而得到了潮流的垂直分布,从而可以计算出海底摩擦和水平流通量及其它们之间“夹角”的时间与空间分布。针对传统海底摩擦经验公式中“夹角”为180°(即海底摩擦与水平流通量方向相反)的假设,该文计算了它们之间夹角在几个空间点上的时间变化,结果表明该夹角均小于180°,是随时间、空间变化的。特别对于全日潮(潮波周期为24小时)该夹角有12小时的变化周期,对于半日潮(潮波周期为12小时)该夹角有6小时变化周期。应该指出的是该变化规律依赖于所选的空间点的位置,同时与外海入侵潮波分布也有关系。总之,对于随时间准周期变化的准地转流,海底摩擦与水平流通量的方向相反的假设是不适宜的。
In [7], the author directly solves the problem of three-dimensional motion without introducing the empirical formula of underwater friction, and strictly deduces the equation of motion of the tide wave. On this basis, we use the spectral method to solve the tidal wave motion in the isthmonic channel, and then obtain the vertical distribution of the tidal current so that the friction and horizontal flux of the ocean bottom and the time between them can be calculated With space distribution. Aiming at the hypothesis that the angle of infiltrations is 180 ° (that is, the friction between seafloor and horizontal flux is opposite) in the empirical empirical formula of submarine friction, the paper calculates the time variation of the angle between them in several space points. The result Show that the angle is less than 180 °, with time and space changes. Especially for the full-day tide (tidal wave cycle is 24 hours) the angle of the 12-hour period of variation, half-day tide (tidal wave cycle of 12 hours) the angle of 6-hour period of variation. It should be pointed out that the law of change depends on the location of the selected spatial point and also on the distribution of invaded tidal waves in the open sea. In summary, the hypotheses that the direction of submarine friction and horizontal flux are opposite are not appropriate for quasi-geostrophic changes with the quasi-periodic changes over time.