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A method for inversion of internal wave amplitude based on multi-dimensional sea surface information

A wave amplitude and inversion technology, which is applied in the field of internal wave amplitude inversion based on multi-dimensional sea surface information, can solve the problem of inability to obtain the fluctuation of sea surface height caused by internal waves and other problems, and achieve the effect of high-precision inversion.

Active Publication Date: 2021-08-31
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] At present, traditional remote sensing methods are used to carry out internal wave amplitude inversion research, and only the information of sea surface convergence and divergence (brightness and darkness interval) is modulated by internal waves. Although the sea surface velocity can be detected, the sea surface height fluctuations caused by internal waves cannot be obtained synchronously. , which limits the use of internal wave-induced multi-dimensional information on the sea surface to carry out research on internal wave detection

Method used

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  • A method for inversion of internal wave amplitude based on multi-dimensional sea surface information
  • A method for inversion of internal wave amplitude based on multi-dimensional sea surface information
  • A method for inversion of internal wave amplitude based on multi-dimensional sea surface information

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Embodiment 3

[0031] Example 3: Influence of Internal Waves on Sea Surface Height

[0032] Such as Figure 5 As shown, both the measured and simulated internal wave experiments have shown that internal waves can cause fluctuations in sea surface height.

[0033] During the actual measurement in the Andaman Sea, it was found that the passage of internal waves would cause the sea surface to bulge, and the empirical formula for the change of sea surface height was given as ~(ρ 2 -ρ 1 )·η 0 , where ρ 1 is the upper water depth density, ρ 2 Lower water depth density, η 0 is the amplitude of the internal wave, indicating that the height of the sea surface fluctuation caused by the internal wave is also closely related to the amplitude of the internal wave.

[0034] Using quasi-synchronous observations of altimeter and SAR images to detect internal waves in the South China Sea, the results show that the sea surface height anomaly caused by internal waves can reach 0.5m. Such as Image 6 As...

Embodiment 2

[0036] Example 2: The influence of internal waves on the sea surface current field

[0037] By analyzing the large-scale internal waves in Dongsha Island, such as Figure 7 As shown, the left picture shows the SAR image of the internal wave, and the right picture shows the information map of the flow velocity caused by the internal wave. The comparison between the two shows that the propagation will cause a strong wave-induced flow. big. The relationship between the amplitude of the internal wave and the wave-induced flow can be expressed as where U x Indicates radial flow velocity caused by internal waves, c 0 Indicates the internal wave linear velocity, h 1 Indicates the upper water depth, η 0 Indicates the amplitude of the internal wave, l represents the characteristic wavelength of the internal wave, and x, t represent the temporal and spatial changes of the internal wave.

[0038] This embodiment shows that the internal wave will have a significant impact on the se...

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Abstract

The invention discloses an internal wave amplitude inversion method based on multi-dimensional sea surface information. The method firstly determines the relevant parameters of the internal wave amplitude inversion: the fluctuation of sea surface height caused by internal waves, the change of sea surface velocity caused by internal waves, the brightness and darkness of internal waves Spacing, water depth and layer depth, density difference, etc.; then choose the artificial neural network as the model, use the determined relevant parameters as the input value, and finally output the amplitude of the internal wave. Based on the remote sensing observation data, the present invention extracts and separates the observation information of internal wave-induced sea surface fluctuations and current velocity changes synchronously, wide swath, etc., and utilizes the extracted multi-dimensional sea surface observation information to realize high-precision inversion of ocean internal wave amplitude .

Description

technical field [0001] The invention belongs to the technical field of ocean observation, and in particular relates to an internal wave amplitude inversion method based on multi-dimensional sea surface information. Background technique [0002] Internal waves are common mesoscale and small-scale dynamic processes in the ocean. Due to the randomness of the generation and propagation of internal ocean waves underwater, it is difficult to predict. The propagation of internal waves is accompanied by large vertical fluctuations and strong shear forces, which pose a serious threat to submarine navigation and offshore operating platforms. Therefore, carrying out internal wave research is of great significance to national defense construction, ocean engineering, and ocean power. The influence of internal waves on the ocean is mainly related to the intensity of internal waves, and the amplitude is an important parameter to measure the intensity of internal waves. [0003] At prese...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C13/00G06N3/04G06N3/08
CPCG01C13/00G06N3/08G06N3/045
Inventor 张旭东李晓峰高乐刘颖洁任沂斌
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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