使用最小二乘法分析和预测来自临时站点的潮汐测量数据

Andi Rusdin, Hideo Oshikawa, Andi M. A. Divanesia, Muksan P. Hatta
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摘要

这项研究在帕卢湾内的三个地方设置了三个临时潮汐站,并配备了压力式潮汐测量仪。这些潮汐站以 5 分钟的采样间隔(Dt)记录了 4 个月的潮汐系列波动。此外,还采用了简单且广泛使用的最小二乘法(LSM),从观测到的潮汐序列中分离出谐波常数成分,包括振幅(Hi)和相位(gi)。根据潮汐发电势(CE)的最大幅值,共选出了 11 个主要成分,包括 M2、K1、S2、O1、P1、N2、Mf、K2、Mm、Q1 和 Msf,它们分别是昼变成分、半昼变成分和长周期成分。结果表明,半周期成分产生的振幅高于日周期成分,而长周期成分产生的振幅相当小。此外,记录到的振幅比例表明,帕卢湾的潮汐主要与半日成分混合。观测值和预测值之间的差异很小,这表明在临时潮汐站进行的测量是有效的。应用的性能指标也表明,与其他方法相比,潮汐监测仪的精度可以接受。此外,使用峰值法计算了潮汐基准,发现帕卢湾的平均潮差(RA)为 2.39 米:PDF
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Analysis and Prediction of Tidal Measurement Data from Temporary Stations using the Least Squares Method
This research was conducted by equipping three temporary tidal stations located in three places inside Palu Bay with pressure-type tidal gauges. The stations recorded tidal series fluctuations for 4 months with a 5-minute sampling interval (Dt). Moreover, the simple and widely used least squares method (LSM) was applied to separate the harmonic constants of constituents, including amplitudes (Hi) and phases (gi), from the observed tidal series. A total of 11 dominant constituents were selected based on the largest magnitudes of tidal generating potential (CE), and these include M2, K1, S2, O1, P1, N2, Mf, K2, Mm, Q1, and Msf, which were diurnal, semidiurnal, and long-period constituents. The results showed that the semidiurnal constituents generated higher amplitudes than the diurnal constituents, while the long-period constituents produced quite small amplitudes. Furthermore, the ratios of amplitudes recorded showed that tidal in Palu Bay was mainly mixed with semidiurnal constituents. The difference between the observed and predicted values was quite small, and this showed the validity of the measurement conducted at the temporary tidal stations. The performance indicators applied also showed that LSM had acceptable accuracy compared to other methods. Moreover, tidal datums were calculated using the peak approach, and the average tidal range (RA) of Palu Bay was found to be 2.39 m. Doi: 10.28991/CEJ-2024-010-02-03 Full Text: PDF
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