不完整逐时潮汐观测记录的分析

通常,只有当观测时段的长度不短于任意两个分潮的会合周期时,这些分潮才能彼此分离。因为属于不同亚群的分潮之间的会合周期最长为一个回归年,所以当观测时段的长度显著短于一年时,我们就认为记录是不完整的。此外,现有的方法通常要求记录是没有间断的。如果出现间断,我们也认为它是不完整的。本文提供一种方法,用以分析这种不完整的观测记录。

AN ANALYSIS OF INCOMPLETE HOURLY TIDAL RECORDS

A method is proposed for calculating harmonic constants from hourly tidal observations which may be incomplete and have breaks.It is pointed out that among a set of constituents,between which the synodical periods are appreciably longer than the time length of the record,only one can be chosen as a main constituent and the phase-lag-differences and amplitude-ratios of the others to the main constituent (called difference-ratio relations) must be given as a presupposition.A least square fit to the record is given to determine the harmonic constants,and the errors of computations for some interesting cases are shown.