Harmonic analysis in tide analysis
Yifan Wan · 2023
Tide is a natural phenomenon which has important impact on port engineering, earthquake forecasting, shipping and many other fields. But in some complex terrains, tide and tide strain are hard to analyze and anticipate. Harmonic analysis plays an important role when researching tide. This passage uses derivation of math and physics to elaborate the essence of tidal strain observation combination and uses it to analyze tidal strain observation combination from some main gauging station in China. Besides, this passage uses t-tide tide analysis tool to analyze and anticipate the tide along the sea area of the Guangdong Province by harmonic analysis and compares it with the observation. The conclusion shows that our analysis on tidal strain has a high accuracy, and it is precise enough for earthquake scholars to research. In addition, using harmonic analysis to forecast tide is precise and stable. The residue error follows the normal distribution, and its average is less than 0.01. The maximum of variance is 0.2294, the minimum is 0.1732. The length of confidence interval is less than 0.01. Using the information of three months and one year is almost unanimous and shows that different seasons will not influence the conclusion.