Improved nudging method for ocean tide assimilation study

CN115310295BActive Publication Date: 2026-05-29OCEAN UNIV OF CHINA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
OCEAN UNIV OF CHINA
Filing Date
2022-08-13
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Traditional nudging methods in global tidal assimilation studies suffer from problems such as underestimating tidal amplitude and large deviations in equinox lag angles, and lack reasonable criteria for relaxation coefficients, leading to unscientific integration of observational data and model results.

Method used

An improved nudging method is adopted, which scientifically gives a new relaxation coefficient by weighting the calculation mode and observation error. The tidal numerical model is assimilated using satellite altimeter data, and the model state is updated by combining sequential assimilation method.

Benefits of technology

It improves the accuracy of tidal simulation, reduces amplitude and lag deviations in shallow and deep water areas, improves the accuracy of tidal energy characterization, and avoids the phenomenon of 'over-convergence'.

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Abstract

The application discloses an improved nudging method for ocean tide assimilation research. In view of the defects of the traditional nudging method, the application combines the updating idea of the sequential assimilation method, calculates the model and observation errors first, then uses the model and observation errors to calculate the nudging relaxation coefficient by weighting, and further uses the observation data to update the model state, so that the observation data and the ocean model are combined scientifically, and a new tide assimilation method is formed. The application overcomes the defect that the given relaxation coefficient in the traditional nudging method has no reasonable basis, scientifically gives a new nudging relaxation coefficient based on the updating idea in the sequential assimilation method, overcomes the problem that the tidal amplitude is small at the coast in the global ocean model assimilation research of the traditional nudging method, and causes the large deviation of the split tide angle after the assimilation, and provides a new assimilation method for accurate ocean tide simulation.
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