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  United States 
• Authors:
  • Miles, J W
  • LEE, Y K
• Publication Date: 1974-4-15

Media Info

• Pagination: 20 p.

Subject/Index Terms

• TRT Terms: Harbors; Shore protection; Structural models; Vibration
• Old TRIS Terms: Harbor models; Harbor storm protection; Wave excited vibration
• Subject Areas: Bridges and other structures; Marine Transportation; Terminals and Facilities;

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