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Application of a modified tidal harmonic analysis method in the analysis of short-term tide levels offshore Zhejiang
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Huamin Zhou1, Haidong Pan2, *, Yuhan Yan1, Liang Liang1, Lixiao Chen1, Haifeng Gao1, Ran Ni3
Haiyang Xuebao | 2025, 47(2) : 29 - 40
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Haiyang Xuebao | 2025, 47(2): 29-40
Application of a modified tidal harmonic analysis method in the analysis of short-term tide levels offshore Zhejiang
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Huamin Zhou1, Haidong Pan2, *, Yuhan Yan1, Liang Liang1, Lixiao Chen1, Haifeng Gao1, Ran Ni3
Affiliations
  • 1Zhejiang Institute of Hydraulics and Estuary (Zhejiang Institute of Marine Planning and Design), Hangzhou, 310020, China
  • 2First Institute of Oceanography, Ministry of Natural Resources, Qingdao, 266061, China
  • 3Ningbo ShangHang Surveying and Mapping Co., LTD., Ningbo 315200, China
Published: 2025-02-28 doi: 10.12284/hyxb2025011
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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
Huamin Zhou, Haidong Pan, Yuhan Yan, Liang Liang, Lixiao Chen, Haifeng Gao, Ran Ni. Application of a modified tidal harmonic analysis method in the analysis of short-term tide levels offshore Zhejiang[J]. Haiyang Xuebao, 2025 , 47 (2) : 29 -40 . DOI: 10.12284/hyxb2025011
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Article Info
doi: 10.12284/hyxb2025011
  • Receive Date：2024-09-03
  • Online Date：2025-10-27
  • Published：2025-02-28
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History
  • Received：2024-09-03
  • Revised：2024-12-25
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Affiliations
    1Zhejiang Institute of Hydraulics and Estuary (Zhejiang Institute of Marine Planning and Design), Hangzhou, 310020, China
    2First Institute of Oceanography, Ministry of Natural Resources, Qingdao, 266061, China
    3Ningbo ShangHang Surveying and Mapping Co., LTD., Ningbo 315200, China
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多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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