Ochi Hubble Wave Spectrum

How to use/model Ochi Hubble wave spectrum in MOSES. Is it possible?

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  • Hi Mohd,
    When inputting a spectrum using the "&data curve f_spectrum/p_spectrum" command, it is necessary to define the Hs (significant wave height) of the entire spectrum. This allows MOSES to scale the spectrum such that the area under the curve equals Hs**2/16.
    If you are using the Ochi formulation, you can find instructions on obtaining Hs for dual-peak spectra in his paper. Assuming that both the low and high-frequency component spectra are narrow-banded, and their sum (the entire spectrum) is also narrow-banded, the following simple relationship holds:
    Hs = sqrt(Hs1**2 + Hs2**2)
    Here, Hs represents the significant wave height of the entire spectrum, Hs1 represents the significant wave height of the low-frequency component, and Hs2 represents the significant wave height of the high-frequency component.
    If the component spectra are not narrow-banded, you can find the derivation for significant wave height in Appendix A of the same paper.
    When using an input spectrum (user-defined) in MOSES, you do not need to define the period. I have attached a document we prepared addressing some user questions related to spectra, which will provide a better understanding of user-defined spectra and important considerations.
    Please feel free to reach out if you have any further questions.
    Regards,
    Rahul

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    Answer Verified By: Mohd Ariff Md Malik 

  • Hi Rahul

    Thanks for the explanation. Its really helpful.