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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on September 8, 2008
ICES Journal of Marine Science: Journal du Conseil 2009 66(2):227-236; doi:10.1093/icesjms/fsn142
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© 2008 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

The acoustic diversity of the seabed based on the similarity index computed from Chirp seismic data

Gwang H. Lee1, Han J. Kim2, Dae C. Kim1, Bo Y. Yi1, Seong M. Nam1, Boo K. Khim3 and Moon S. Lim4

1 Department of Environmental Exploration Engineering, Pukyong National University, Busan 608-737, Korea
2 Korea Ocean Research and Development Institute, Ansan 426-744, Korea
3 Division of Earth Environmental System, Pusan National University, Busan 609-735, Korea
4 Geo-Marine Technology, Busan 608-020, Korea

Correspondence to G. H. Lee: tel: +82 51 6296558; fax: +82 51 6296553; e-mail: gwanglee{at}pknu.ac.kr

Lee, G. H., Kim, H. J., Kim, D. C., Yi, B. Y., Nam, S. M., Khim, B. K., and Lim, M. S. 2009. The acoustic diversity of the seabed based on the similarity index computed from Chirp seismic data. – ICES Journal of Marine Science, 66: 227–236.

The similarity index (SI), computed from the singular value decomposition of seabed-echo envelopes recorded in Chirp seismic data, was tested in mapping the acoustic diversity of the seabed in Suyong Bay, Busan, Korea. Rocky bottom is characterized by low SI values, indicating acoustic heterogeneity, and sedimentary seabed by high SI values, also indicating acoustic homogeneity. Isolated areas of low SI values, not identified as rocky bottom in Chirp profiles, may suggest a shallow basement. The gradual seaward change of the substratum from coarse-grained to relatively poorly sorted, finer-grained sediments also corresponds to an overall seaward decrease in the SI value. The straightforward and quick computation of the SI makes it possible to assess the gross acoustic diversity of the seabed in almost real time.

Keywords: acoustic seabed classification, Chirp seismic data, similarity index, singular value decomposition

Received 15 March 2008; accepted 30 July 2008; advance access publication 8 September 2008.


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