| Low-frequency sound speed and attenuation in sandy seabottom from long-range broadband acoustic measurements. | |
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MedLine Citation:
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PMID: 20707427 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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A joint China-U.S. underwater acoustics experiment was conducted in the Yellow Sea with a very flat bottom and a strong and sharp thermocline. Broadband explosive sources were deployed both above and below the thermocline along two radial lines up to 57.2 km and a quarter circle with a radius of 34 km. Two inversion schemes are used to obtain the seabottom sound speed. One is based on extracting normal mode depth functions from the cross-spectral density matrix. The other is based on the best match between the calculated and measured modal arrival times for different frequencies. The inverted seabottom sound speed is used as a constraint condition to extract the seabottom sound attenuation by three methods. The first method involves measuring the attenuation coefficients of normal modes. In the second method, the seabottom sound attenuation is estimated by minimizing the difference between the theoretical and measured modal amplitude ratios. The third method is based on finding the best match between the measured and modeled transmission losses (TLs). The resultant seabottom attenuation, averaged over three independent methods, can be expressed as alpha=(0.33+/-0.02)f(1.86+/-0.04)(dB/m kHz) over a frequency range of 80-1000 Hz. |
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Authors:
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Lin Wan; Ji-Xun Zhou; Peter H Rogers |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: The Journal of the Acoustical Society of America Volume: 128 ISSN: 1520-8524 ISO Abbreviation: J. Acoust. Soc. Am. Publication Date: 2010 Aug |
Date Detail:
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Created Date: 2010-08-16 Completed Date: 2011-01-27 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7503051 Medline TA: J Acoust Soc Am Country: United States |
Other Details:
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Languages: eng Pagination: 578-89 Citation Subset: IM |
Affiliation:
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School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0405, USA. lin.wan@gatech.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Acoustics* Algorithms Geologic Sediments Models, Theoretical Motion Oceans and Seas Radar* Signal Processing, Computer-Assisted Sound* Sound Spectrography Time Factors |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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