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Transformation Of Infragravity Waves During Hurricane Overwash

Supporting Files


Details

  • Journal Title:
    Journal of Marine Science and Engineering
  • Personal Author:
  • NOAA Program & Office:
    Sea Grant
  • Sea Grant Program:
    TAMU (Texas Sea Grant)
  • Description:
    Infragravity (IG) waves are expected to contribute significantly to coastal flooding and sediment transport during hurricane overwash, yet the dynamics of these low-frequency waves during hurricane impact remain poorly documented and understood. This paper utilizes hydrodynamic measurements collected during Hurricane Harvey (2017) across a low-lying barrier-island cut (Texas, U.S.A.) during sea-to-bay directed flow (i.e., overwash). IG waves were observed to propagate across the island for a period of five hours, superimposed on and depth modulated by very-low frequency storm-driven variability in water level (5.6 min to 2.8 h periods). These sea-level anomalies are hypothesized to be meteotsunami initiated by tropical cyclone rainbands. Estimates of IG energy flux show that IG energy was largely reduced across the island (79-86%) and the magnitude of energy loss was greatest for the lowest-frequency IG waves (<0.01 Hz). Using multitaper bispectral analysis, it is shown that, during overwash, nonlinear triad interactions on the sea-side of the barrier island result in energy transfer from the low-frequency IG peak to bound harmonics at high IG frequencies (>0.01 Hz). Assuming this pattern of nonlinear energy exchange persists across the wide and downward sloping barrier-island cut, it likely contributes to the observed frequency-dependence of cross-barrier IG energy losses during this relatively low surge event (<1 m).
  • Keywords:
  • Source:
    Journal of Marine Science and Engineering, 8(8), 545
  • DOI:
  • Document Type:
    Journal Article
  • Funding:
    Grant no. NA14OAR4170102
  • Place as Subject:
    Texas
  • License:
  • Rights Information:
    CC BY
  • Compliance:
    Library
  • Main Document Checksum:
    urn:sha256:9c196c64892ff22b94f56d9df55b59653d523b157503b86706ea713b84ad962c
  • Download URL:
  • File Type:
    Filetype[PDF - 7.83 MB ]
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