A non-Gaussian degree evaluation method of wave field suitable for real oceans

Abstract

The present invention provides a method suitable for evaluating the degree of non-Gaussian state of a wave field in a real ocean, the method comprising: i) a numerical model capable of simulating a real non-Gaussian state wave field; A database of the corresponding relationship between the "wave spectrum and the degree of non-Gaussian state of the wave field" of the marine environment; iii) and a method for extracting the degree of non-Gaussian state of the wave field from the above database based on the evaluated ocean wave spectrum; the present invention can accurately and conveniently obtain the evaluated ocean wave The degree of non-Gaussian state of the wave field represented by the spectrum is helpful to improve the prediction accuracy of disastrous waves such as deformed waves and extreme large waves; this method can be transplanted into any third-generation wave model and applied to operational wave forecasting; The representation of the degree of non-Gaussian state in this method - parameter RP μ3 and RP μ4 It can be converted with the commonly used parameters of skewness and kurtosis, thus further expanding the scope of application of this method.

Description

technical field [0001] The invention relates to the technical field of physical oceanography, in particular to a method for evaluating the degree of non-Gaussian state of a wave field suitable for real oceans. Background technique [0002] Deformed waves are a very destructive wave phenomenon, which poses a serious threat to marine activities such as human navigation, ocean fishing, and oil exploration. [0003] The currently widely accepted (in open ocean) formation mechanisms of deformed waves are all related to the nonlinear interaction between the components of the wave field. The nonlinear focusing of wave energy caused by these mechanisms leads to the formation of deformed waves on the one hand, and the On the other hand, the height of the wave surface deviates from the Gaussian (normal) distribution of the linear wave field statistically, and a non-Gaussian sea state is formed. The probability of occurrence is proportional to each other. Therefore, the probability of...

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Problems solved by technology

Therefore, in the actual calculation of the non-Gaussian state of the wave field, the wave spectrum related characteristic parameters of the real wave field will involve a range that cannot be covered by the current idealized approximation, although the existing technology has taken various measures to correct this "blind area" However, its accuracy in estimating the degree of non-Gaussian state of the wave field in the "blind zone" is still questionable, which will further affect the accuracy of the entire actual forecast

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