Application of a modified tidal harmonic analysis method in the analysis of short-term tide levels offshore Zhejiang

Huamin Zhou; Haidong Pan; Yuhan Yan; Liang Liang; Lixiao Chen; Haifeng Gao; Ran Ni

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Huamin Zhou，Haidong Pan，Yuhan Yan, et al. Application of a modified tidal harmonic analysis method in the analysis of short-term tide levels offshore Zhejiang[J]. Haiyang Xuebao，2025, 47(x)：1–12

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Application of a modified tidal harmonic analysis method in the analysis of short-term tide levels offshore Zhejiang

1.
Zhejiang Institute of Hydraulics and Estuary (Zhejiang Institute of Marine Planning and Design), Hangzhou, 310020, China
2.
First Institute of Oceanography, Ministry of Natural Resources, Qingdao, 266061, China
3.
Ningbo ShangHang Surveying and Mapping Co., LTD., Ningbo 315200, China

Received Date: 2024-09-03
Rev Recd Date: 2024-12-25

Available Online: 2025-01-22

Abstract

Abstract

Due to the limitations of the Rayleigh criterion, classical harmonic analysis (CHA) model requires half a year of data records to analyze the eight main tidal constituents, namely, M₂, S₂, N₂, K₂, K₁, O₁, P₁, Q₁. For short-term tidal records, the unresolved constituents typically rely on the ratio differences from nearby long-term tidal stations for estimation. However, there is a scarcity of publicly available long-term tidal data in the coastal areas of Zhejiang, which currently prevents the accurate extraction of the main constituents from short-term records. This paper introduces a modified harmonic analysis model, referred to as the Modified Harmonic Analysis model based on the Credo of Smoothness (MHACS). Based on the smooth functions established by the intrinsic connections between major constituents, it breaks through the Rayleigh criterion, significantly reducing the length of tidal records required, especially suitable for coastal areas with abundant short-term data. This algorithm was applied to the multi-island area of Zhejiang offshore, using tidal records shorter than 15 days. The results show that the harmonic constants of the eight main constituents at the Shipu station are very close to the results obtained by the CHA method, and the required data length is reduced from 8760 hours to 336 hours, which can be used to calculate characteristic parameters such as the theoretical depth datum. For analyzing the eight main constituents along the Zhejiang coast using MHACS, a minimum data length of 5 days is recommended.
- Zhejiang offshore,
- multi-island,
- short-term tidal records,
- harmonic analysis,
- tidal admittance

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References(21)

References

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