The collection comprises a movie file, two audio track files and a written report, illustrated by photographs, about sounds generated by a tidal bore event in the Baie du Mont Saint Michel in France. A tidal bore is a sharp rise in free-surface elevation propagating upstream in an estuarine system at the leading edge of the flood tide. It generates a powerful noise that has sometimes been compared to the sound of a horse cavalcade.

The data covers three distinct periods:
1. the incoming tidal bore when the sound amplitude increased with the approaching bore front;
2. the passage of the tidal bore in front of the microphone where the impacts of the bore on the bank, rocks or jetty generated powerful noises;
3. the upstream propagation of the bore when the flood flow motion caused additional loud noises.

During the arrival of the tidal bore, the sound levels were weaker and a lower pitch sound was noted than during the subsequent record. For the breaking bore process, the analysis of the sound record indicated a dominant frequency around 76-77 Hz. The low pitch rumble had a frequency comparable to the collective bubble oscillations, suggesting that air entrapment in the bore roller might play a major role in the acoustic signature.

The report and an audio file are available online.

Collectors
Party Professor Hubert Chanson
Mascaret   Roller   Tides   Sée River   Noise   Rumble   Sounds   Microphone   Tidal bores   Ocean waves   Baie du Mont Saint Michel   Acoustic noise   Turbulence   099902   091599   091508   091103   090509  

All materials copyright Professor Hubert Chanson, Division of Civil Engineering, The University of Queensland Any use of the audio file must acknowledge and cite the associated publication

View Source XML

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The data covers three distinct periods:
1.	the incoming tidal bore when the sound amplitude increased with the approaching bore front;
2.	the passage of the tidal bore in front of the microphone where the impacts of the bore on the bank, rocks or jetty generated powerful noises;
3.	the upstream propagation of the bore when the flood flow motion caused additional loud noises. 

During the arrival of the tidal bore, the sound levels were weaker and a lower pitch sound was noted than during the subsequent record. For the breaking bore process, the analysis of the sound record indicated a dominant frequency around 76-77 Hz. The low pitch rumble had a frequency comparable to the collective bubble oscillations, suggesting that air entrapment in the bore roller might play a major role in the acoustic signature.

The report and an audio file are available online.</description>
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      <subject type="local">Roller</subject>
      <subject type="local">Tides</subject>
      <subject type="local">S&#xE9;e River</subject>
      <subject type="local">Noise</subject>
      <subject type="local">Rumble</subject>
      <subject type="local">Sounds</subject>
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      <subject type="local">Tidal bores</subject>
      <subject type="local">Ocean waves</subject>
      <subject type="local">Baie du Mont Saint Michel</subject>
      <subject type="local">Acoustic noise</subject>
      <subject type="local">Turbulence</subject>
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      <subject type="anzsrc-for">091508</subject>
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