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A Method for Improving the Water Level Accuracy of Rare Tide Gauge Data Control

A technology for data control and tide detection, which is used in electrical digital data processing, special data processing applications, instruments, etc.

Active Publication Date: 2016-05-18
THE FIRST INST OF OCEANOGRAPHY SOA
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Problems solved by technology

[0002] Tidal forecasting can only calculate the sea surface height driven by tidal action through tidal parameters. In fact, although the actual rise and fall of the sea surface mainly manifests itself as tidal changes, the changes in short-term signal properties caused by meteorological and other factors also have a non-negligible magnitude.

Method used

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  • A Method for Improving the Water Level Accuracy of Rare Tide Gauge Data Control
  • A Method for Improving the Water Level Accuracy of Rare Tide Gauge Data Control
  • A Method for Improving the Water Level Accuracy of Rare Tide Gauge Data Control

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Embodiment Construction

[0026] (1) Numerical simulation method

[0027] This method uses the hydrodynamic numerical model under the σ coordinate to construct the tidal wave numerical model of the target sea area. The governing equation of the model can be expressed as:

[0028]

[0029]

[0030]

[0031] In order to make this method suitable for deep water areas, the tidal force is considered in the tidal wave model. In order to consider the effect of tidal force, ζ in model control equations (2) and (3) should be rewritten as ζ′, which considers tidal potential, body tide, load tide and self-priming effect. Its principle is explained as follows.

[0032] The height of the sea surface observed by the satellite altimeter is the distance between the sea surface and the reference ellipsoid of the earth, which is called the geocentric tide, denoted as ζ g , which is equal to the sum of the usual ocean tide ζ and the solid earth tide; b and ocean-load tide ζ l composed of the sum. Therefore...

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Abstract

The invention relates to a high-precision water level calculation technology for rare tide station data control. Firstly, tide station data is assimilated by utilizing a data assimilation technology, a high-precision tidal harmonic constant is acquired, an instant tidal level is calculated by building a tide prediction model, then a non-tide water level is detected by tide station observation data, and the non-tide water level is pushed and estimated to the required water level calculation point according to good space consistency characteristic of a residual water level, thus high-precision recovery and representation of the actual water level are realized, and the aim of providing accurate instantaneous water level information for sea reef measurement is achieved.

Description

technical field [0001] The invention belongs to the field of marine monitoring, in particular to a method for improving the water level accuracy of data control of rare tide gauge stations. Background technique [0002] Tidal forecasting can only calculate the sea surface height driven by tidal action through tidal parameters. In fact, although the actual rise and fall of the sea surface mainly manifests itself as tidal changes, the changes in short-term signal properties caused by meteorological and other factors also have a non-negligible magnitude. This method first uses data assimilation technology to assimilate tide station data to obtain high-precision tidal harmonic constants, calculates the instantaneous tide height by establishing a tide forecast model, and then detects non-tidal water levels from the observation data of tide stations, and according to the space with good residual water level Consistency feature, estimate the non-tidal water level to the required wa...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
Inventor 魏泽勋王永刚徐晓庆李淑江高秀敏
Owner THE FIRST INST OF OCEANOGRAPHY SOA
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