大连老虎滩海域潮汐调和分析

Tidal harmonic analysis in Laohutan sea area of Dalian

利用T_TIDE工具箱对老虎滩验潮站1 a及3 M逐时潮位资料进行调和分析。结果表明:1 a潮位能调和分析出较多的天文分潮和浅水分潮,按振幅大小排列,前6个主要分潮分别为M_(2)、S_(2)、K_(1)、SA、N_(2)和O_(1)。对3 M潮位数据进行调和分析时,为保证获取足够的分潮,需要利用主分潮和随从分潮的差比关系来推算随从分潮,并添加必要的浅水分潮。利用1 a逐时潮位资料计算得出的调和常数进行2019年天文潮预报,实测与预报对比得出的潮高残差整体服从正态分布,残差均值小于10^(-2)m,置信区间长度小于10^(-2)。将天文潮预报值与潮汐表数据进行比较,对比发现两者差异较小,进一步证实利用T_TIDE开展天文潮预报的可行性。

The hourly tidal level data of Laohutan tidal gauge station for one year and 3 months are used for tidal harmonic analysis(HA),respectively,by using T_TIDE toolbox.The results show that the astronomical tidal components and shallow-water tidal components can be obtained by using the one-year tidal level data,and the first six main tidal components with the largest amplitude are M_(2),S_(2),K_(1),SA,N_(2) and O_(1).For the HA of the 3-months tidal level data,in order to obtain sufficient tidal components,it is necessary to use the difference ratio between the main tidal components and the accompanying tidal components to calculate the accompanying tidal components and add necessary shallow-water tidal components.The harmonic constants calculated from the oneyear hourly tidal level data are used to predict the astronomical tide in 2019.The residual noise is normally distributed in general with the residual mean less than 10^(-2)m and the length of 95%confidence interval less than 10^(-2).Comparing the predicted astronomical tide with the tide table,it is found that there is little difference between them,which proves the feasibility of T_TIDE in predicting the astronomical tide.