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An observational study of coastal trapped wave scattering in the deep ocean of the Suruga Trough: the role of internal lee waves.

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Title: An observational study of coastal trapped wave scattering in the deep ocean of the Suruga Trough: the role of internal lee waves.
Authors: Nagai, Taira1 (AUTHOR) nagai_taira57@fra.go.jp, Hibiya, Toshiyuki2 (AUTHOR), Kutsuwada, Kunio3 (AUTHOR)
Source: Journal of Oceanography. Jun2026, Vol. 82 Issue 3, p199-209. 11p.
Subject Terms: *Internal waves, *Submarine topography, *Oceanic mixing, *Wave diffraction, *Tidal currents, *Oceanographic observations
Geographic Terms: Japan
Abstract: In this study, the scattering and dissipation processes of diurnal coastal trapped waves (CTWs) are investigated using mooring observations and direct microstructure measurements in the Suruga Trough, Japan. First, we perform spectral and harmonic analyses of the observed data, confirming the presence of diurnal CTWs characterized by velocity and temperature perturbations that are most pronounced near the seafloor. The interaction of bottom-intensified CTW currents with a small-scale bathymetric bump generates high-frequency waves, exhibiting spectral peaks at the harmonics of the diurnal tidal constituents. These high-frequency waves are identified as internal lee waves based on the dispersion relationship and are responsible for strong mixing on the lee side of the bathymetric bump, as evidenced by microstructure measurements. Using moored velocity records, we further examine the parameter dependence of internal lee wave generation by CTWs propagating over the bathymetric bump. The results indicate that internal lee wave activity intensifies when the tidal excursion parameter falls within an intermediate range between 1 and the stratification parameter. In contrast, when exceeds , the energy of internal lee waves decreases markedly due to the formation of "evanescent waves" resulting from strong interactions between CTWs and the bathymetric bump. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 194776552
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Label: Title
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  Data: An observational study of coastal trapped wave scattering in the deep ocean of the Suruga Trough: the role of internal lee waves.
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  Data: <searchLink fieldCode="AR" term="%22Nagai%2C+Taira%22">Nagai, Taira</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> nagai_taira57@fra.go.jp</i><br /><searchLink fieldCode="AR" term="%22Hibiya%2C+Toshiyuki%22">Hibiya, Toshiyuki</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kutsuwada%2C+Kunio%22">Kutsuwada, Kunio</searchLink><relatesTo>3</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Oceanography%22">Journal of Oceanography</searchLink>. Jun2026, Vol. 82 Issue 3, p199-209. 11p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Internal+waves%22">Internal waves</searchLink><br />*<searchLink fieldCode="DE" term="%22Submarine+topography%22">Submarine topography</searchLink><br />*<searchLink fieldCode="DE" term="%22Oceanic+mixing%22">Oceanic mixing</searchLink><br />*<searchLink fieldCode="DE" term="%22Wave+diffraction%22">Wave diffraction</searchLink><br />*<searchLink fieldCode="DE" term="%22Tidal+currents%22">Tidal currents</searchLink><br />*<searchLink fieldCode="DE" term="%22Oceanographic+observations%22">Oceanographic observations</searchLink>
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  Label: Geographic Terms
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Japan%22">Japan</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: In this study, the scattering and dissipation processes of diurnal coastal trapped waves (CTWs) are investigated using mooring observations and direct microstructure measurements in the Suruga Trough, Japan. First, we perform spectral and harmonic analyses of the observed data, confirming the presence of diurnal CTWs characterized by velocity and temperature perturbations that are most pronounced near the seafloor. The interaction of bottom-intensified CTW currents with a small-scale bathymetric bump generates high-frequency waves, exhibiting spectral peaks at the harmonics of the diurnal tidal constituents. These high-frequency waves are identified as internal lee waves based on the dispersion relationship and are responsible for strong mixing on the lee side of the bathymetric bump, as evidenced by microstructure measurements. Using moored velocity records, we further examine the parameter dependence of internal lee wave generation by CTWs propagating over the bathymetric bump. The results indicate that internal lee wave activity intensifies when the tidal excursion parameter falls within an intermediate range between 1 and the stratification parameter. In contrast, when exceeds , the energy of internal lee waves decreases markedly due to the formation of "evanescent waves" resulting from strong interactions between CTWs and the bathymetric bump. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1007/s10872-025-00783-7
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 11
        StartPage: 199
    Subjects:
      – SubjectFull: Internal waves
        Type: general
      – SubjectFull: Submarine topography
        Type: general
      – SubjectFull: Oceanic mixing
        Type: general
      – SubjectFull: Wave diffraction
        Type: general
      – SubjectFull: Tidal currents
        Type: general
      – SubjectFull: Oceanographic observations
        Type: general
      – SubjectFull: Japan
        Type: general
    Titles:
      – TitleFull: An observational study of coastal trapped wave scattering in the deep ocean of the Suruga Trough: the role of internal lee waves.
        Type: main
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      – PersonEntity:
          Name:
            NameFull: Nagai, Taira
      – PersonEntity:
          Name:
            NameFull: Hibiya, Toshiyuki
      – PersonEntity:
          Name:
            NameFull: Kutsuwada, Kunio
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          Dates:
            – D: 01
              M: 06
              Text: Jun2026
              Type: published
              Y: 2026
          Identifiers:
            – Type: issn-print
              Value: 09168370
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            – Type: volume
              Value: 82
            – Type: issue
              Value: 3
          Titles:
            – TitleFull: Journal of Oceanography
              Type: main
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