A Polynomial Spectrum Fitting Method for Characterizing Shallow Water Wave Energy Characteristics Near Islands and Reefs

Abstract

A polynomial wave spectrum fitting method for characterizing shallow water wave energy characteristics near islands and reefs belongs to the field of marine engineering. According to the spectral characteristics of shallow water waves, this method proposes corresponding polynomial spectral representation forms for unimodal and bimodal spectra. The proposed polynomial wave spectrum representation form can express the energy distribution of wave spectrum near islands and reefs in the measured data. Compared with the commonly used wave spectrum form, the polynomial form proposed by the present invention fits the high-frequency part of the wave spectrum more in line with the characteristics of the shallow water wave spectrum, and can complete the fitting work of the bimodal spectrum at the same time.

Description

technical field [0001] The invention relates to a polynomial wave spectrum fitting method for characterizing the energy characteristics of shallow water waves near islands and reefs, and belongs to the field of marine engineering. Background technique [0002] The distribution form of wave energy is of great significance to marine scientific research and marine engineering construction. For the short-term wave environment within 20 minutes to 6 hours, the wave height history is usually regarded as a steady-state random process, and the energy spectral density form relative to the wave frequency is obtained according to the wave height history transformation. Common spectral types used to characterize wave energy characteristics include JONSWAP, PM, Newman, and ITTC dual-parameter spectra. These spectral types are generally suitable for single-peak wave spectra in deep water areas, and have been verified by a large number of measured data. [0003] The energy characteristic...

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Problems solved by technology

[0003] The energy characteristics of shallow water waves are different from those in deep water, and the energy characteristics of shallow water waves cannot be well expressed by using the existing spectral shape or its modified form

At the same time, there are a large number of bimodal spectrum forms in the wave environment near islands and reefs. The commonly used spectrum forms are mostly designed for the single-peak spectrum form, and the energy distribution of the bimodal spectrum form is not fully considered.

[0004] For the shallow water wave environment near islands and reefs that is different from the deep water wave environment, the existing common wave spectrum forms cannot express the internal energy distribution well. spectral characterization method

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