The Effect of Monomolecular Films on Low Sea State Ambient Noise
Abstract
A series of experiments conducted during low sea state conditions show that surface-related ambient noise is significantly reduced beneath monomolecular films. Although the amount of noise reduction varies between experiments, the highest attenuations reach 8 dB for frequencies of 1 kHz and higher. The ambient noise spectra beneath these films generally resemble those of non-filmed lower sea states. Preliminary low sea state experiments, providing simultaneous aural and visual monitoring of the sea surface from a depth of one meter, suggest that, in the absence of whitecapping, films attenuate surface noise by dramatically reducing the number of microbreaks which are associated with bubble entraining noise.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1991
- Accession Number
- ADA240224
Entities
People
- Garr Updegraff
- Jim J. Rohr