基于不同潮汐类型的不同时间尺度分潮结果精度分析

The Different Time Scales Tidal Constituents Precision Results Analysis Based on Different Tidal Types

选取4种不同潮汐类型的验潮站实测潮位资料,对验潮零点在一定范围内变动对调和分析结果的影响进行分析,结果表明,一年的潮位数据中若后续6个月的数据发生10 cm、20 cm、30 cm零点漂移,各分潮振幅最大变化量为0.47 cm,迟角为0.16°。采用1~12个月不同中期尺度的实测数据,对调和结果的精度进行分析,结果表明,当潮位观测数据时间尺度小于6个月时,其4个主要分潮O_1、K_1、M_2、S_2振幅综合中误差在2 cm以上,迟角中误差在2°以上,具有显著的不稳定性;相同时间尺度的不同潮汐类型的潮位站潮位资料调和分析得到的主要分潮的振幅精度差异较大,迟角分布相似。当潮位观测数据时间尺度达到或多于6个月时,澳门站、汕尾站的分潮综合中误差分别为1.16 cm、0.61 cm,厦门站、北海站分别为2.90 cm和2.51 cm;各分潮迟角中误差均在2°内。当时间尺度超过9个月后,4个验潮站分潮振幅综合中误差均在2 cm以内,各分潮迟角中误差均在1°左右。

Based on the measured tide data of four different types of tidal station, firstly, we analysis the changes of harmonic analysis results within a certain range of the tide origin zero. The results showed that if the one year of tide data subsequent six months occurred 10cm, 20cm, 30cm zero drift, the constituent amplitude is 0.47cm in maximum variation, phase is 0.16°. We analysis the precision of harmonic results by the different mid - scale 1 - 12 months measured data. It shows that the time scales of less than 6 months tidal data obtain the four main tidal O1, K1, M2, S2 amplitude synthesis＇ s error 2cm above, phase＇ s error 2° above, indicating the signifi- cant instability. The same time scale of different types of tide stations＇ s harmonic analysis main tidal constituent accuracy is in big difference, however phase＇ s distribution is similar. For the Macao and Shanwei station, a 6 - month scale tidal data obtained the four main constituents amplitude synthesis error is 1.16cm and 0.61cm; the Xiamen and Beihai station vary about 2.90cm and 2.51cm. Each tide phase error is within 2°. When the time of nine months or more, four tide stations tidal amplitude synthesis error is less than 2cm, the tide phase error of about 1°.