Bubble size distribution for waves propagating over a submerged breakwater

Tsung Mo Tien, Ching Jer Huang, Tai Wen Hsu, Chien Hsun Lee, Shi Sheng Hsu

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Experiments are carried out to study the characteristics of active bubbles entrained by breaking waves as these propagate over an abruptly topographical change or a submerged breakwater. Underwater sounds generated by the entrained air bubbles are detected by a hydrophone connected to a charge amplifier and a data acquisition system. The size distribution of the bubbles is then determined inversely from the received sound frequencies. The sound signals are converted from time domain to time-frequency domain by applying Gabor transform. The number of bubbles with different sizes are counted from the signal peaks in the time-frequency domain. The characteristics of the bubbles are in terms of bubble size spectra, which account for the variation in bubble probability density related to the bubble radius r. The experimental data demonstrate that the bubble probability density function shows a -2.39 power-law scaling with radius for r > 0.8 mm, and a -1.11 power law for r < 0.8 mm.

Original languageEnglish
Pages (from-to)227-240
Number of pages14
JournalChina Ocean Engineering
Issue number2
Publication statusPublished - 2008 Jun

All Science Journal Classification (ASJC) codes

  • Oceanography
  • Renewable Energy, Sustainability and the Environment
  • Ocean Engineering
  • Mechanical Engineering


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