HELMHOLTZ RESONANCE OF HARBOURS

The resonant response of a harbour H of depth scale d and area A to excitation of frequency omega through a mouth of width a is calculated. The results are relevant to the tsunami response of narrow-mouthed harbours. It is assumed that an adequate approximation to the radiation impedance of the external domain is available. Several examples are considered, including a model of Long Beach Harbor, for which the calculated resonant frequency of the dominant mode is within 1% of the measured value. The effects of entry-separation and bottom-friction losses are considered; the latter are typically negligible, whereas the former may be comparable with, or dominate, radiation losses.

  • Supplemental Notes:
    • Also published in Journal of Fluid Mechanics, V67, Pt 3, pp 445-464, 1975.
  • Corporate Authors:

    University of California, San Diego

    La Jolla Institute of Geophysics and Planetary Physics
    La Jolla, CA  USA 
  • Authors:
    • Miles, J W
    • LEE, Y K
  • Publication Date: 1974-4-15

Media Info

  • Pagination: 20 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00098785
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Contract Numbers: N00014-69A-0200-6005, NSF-GA-35396X
  • Files: TRIS
  • Created Date: Aug 13 1975 12:00AM