Significant wave height retrieval from synthetic radar images

Andreas Parama Wijaya, Embrecht W.C. van Groesen

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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    Abstract

    In many offshore activities radar imagery is used to observe and predict ocean waves. An important issue in analyzing the radar images is to resolve the significant wave height. Different from 3DFFT methods that use an estimate related to the square root of the signal-to-noise ratio of radar images, in this paper we present a completely different approach. This approach is based on the intuitive observation that the shadowing of waves leads to a visibility that depends on the distance from the radar. We will show that for irregular waves the visibility depends in a characteristic way on the distance normalized by the peak wavelength, and on the ratio of radar height and significant wave height and only slightly on the details of the wave spectrum. By comparing the visibility of a specific sea with results of Monte Carlo simulations of sea states with various significant wave heights, the best LSM fit then determines the significant wave height. In this paper we restrict to long-crested waves and illustrate the method with various cases.
    Original languageUndefined
    Title of host publicationProceedings of the 11th International Conference on Hydrodynamics, ICHD 2014
    Place of PublicationSingapore
    PublisherMaritime Research Centre, Nanyang Technological University
    Pages44
    Number of pages7
    ISBN (Print)978-981-09-2175-0
    Publication statusPublished - 19 Oct 2014

    Publication series

    Name
    PublisherMaritime Research Centre, Nanyang Technological University

    Keywords

    • EWI-25700
    • METIS-309882
    • IR-94245

    Cite this

    Wijaya, A. P., & van Groesen, E. W. C. (2014). Significant wave height retrieval from synthetic radar images. In Proceedings of the 11th International Conference on Hydrodynamics, ICHD 2014 (pp. 44). Singapore: Maritime Research Centre, Nanyang Technological University.
    Wijaya, Andreas Parama ; van Groesen, Embrecht W.C. / Significant wave height retrieval from synthetic radar images. Proceedings of the 11th International Conference on Hydrodynamics, ICHD 2014. Singapore : Maritime Research Centre, Nanyang Technological University, 2014. pp. 44
    @inproceedings{37c3d96b30414c5097390510d1263b4c,
    title = "Significant wave height retrieval from synthetic radar images",
    abstract = "In many offshore activities radar imagery is used to observe and predict ocean waves. An important issue in analyzing the radar images is to resolve the significant wave height. Different from 3DFFT methods that use an estimate related to the square root of the signal-to-noise ratio of radar images, in this paper we present a completely different approach. This approach is based on the intuitive observation that the shadowing of waves leads to a visibility that depends on the distance from the radar. We will show that for irregular waves the visibility depends in a characteristic way on the distance normalized by the peak wavelength, and on the ratio of radar height and significant wave height and only slightly on the details of the wave spectrum. By comparing the visibility of a specific sea with results of Monte Carlo simulations of sea states with various significant wave heights, the best LSM fit then determines the significant wave height. In this paper we restrict to long-crested waves and illustrate the method with various cases.",
    keywords = "EWI-25700, METIS-309882, IR-94245",
    author = "Wijaya, {Andreas Parama} and {van Groesen}, {Embrecht W.C.}",
    year = "2014",
    month = "10",
    day = "19",
    language = "Undefined",
    isbn = "978-981-09-2175-0",
    publisher = "Maritime Research Centre, Nanyang Technological University",
    pages = "44",
    booktitle = "Proceedings of the 11th International Conference on Hydrodynamics, ICHD 2014",

    }

    Wijaya, AP & van Groesen, EWC 2014, Significant wave height retrieval from synthetic radar images. in Proceedings of the 11th International Conference on Hydrodynamics, ICHD 2014. Maritime Research Centre, Nanyang Technological University, Singapore, pp. 44.

    Significant wave height retrieval from synthetic radar images. / Wijaya, Andreas Parama; van Groesen, Embrecht W.C.

    Proceedings of the 11th International Conference on Hydrodynamics, ICHD 2014. Singapore : Maritime Research Centre, Nanyang Technological University, 2014. p. 44.

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

    TY - GEN

    T1 - Significant wave height retrieval from synthetic radar images

    AU - Wijaya, Andreas Parama

    AU - van Groesen, Embrecht W.C.

    PY - 2014/10/19

    Y1 - 2014/10/19

    N2 - In many offshore activities radar imagery is used to observe and predict ocean waves. An important issue in analyzing the radar images is to resolve the significant wave height. Different from 3DFFT methods that use an estimate related to the square root of the signal-to-noise ratio of radar images, in this paper we present a completely different approach. This approach is based on the intuitive observation that the shadowing of waves leads to a visibility that depends on the distance from the radar. We will show that for irregular waves the visibility depends in a characteristic way on the distance normalized by the peak wavelength, and on the ratio of radar height and significant wave height and only slightly on the details of the wave spectrum. By comparing the visibility of a specific sea with results of Monte Carlo simulations of sea states with various significant wave heights, the best LSM fit then determines the significant wave height. In this paper we restrict to long-crested waves and illustrate the method with various cases.

    AB - In many offshore activities radar imagery is used to observe and predict ocean waves. An important issue in analyzing the radar images is to resolve the significant wave height. Different from 3DFFT methods that use an estimate related to the square root of the signal-to-noise ratio of radar images, in this paper we present a completely different approach. This approach is based on the intuitive observation that the shadowing of waves leads to a visibility that depends on the distance from the radar. We will show that for irregular waves the visibility depends in a characteristic way on the distance normalized by the peak wavelength, and on the ratio of radar height and significant wave height and only slightly on the details of the wave spectrum. By comparing the visibility of a specific sea with results of Monte Carlo simulations of sea states with various significant wave heights, the best LSM fit then determines the significant wave height. In this paper we restrict to long-crested waves and illustrate the method with various cases.

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    KW - METIS-309882

    KW - IR-94245

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    BT - Proceedings of the 11th International Conference on Hydrodynamics, ICHD 2014

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    Wijaya AP, van Groesen EWC. Significant wave height retrieval from synthetic radar images. In Proceedings of the 11th International Conference on Hydrodynamics, ICHD 2014. Singapore: Maritime Research Centre, Nanyang Technological University. 2014. p. 44