Abstract
The fast sound speed at sea surface in the water surrounding Taiwan causes strong refraction. If the water depth is shallower than 5000 m, the sound ray will reflect at the bottom, causing severe bottom losses. Therefore, geo-acoustic parameters are important for acoustic studies in the water surrounding Taiwan. In the past, researchers used single-pulse sonar of 3.5 kHz to obtain geo-acoustic parameters by the spectral ratio technique. Now the sediment exploration has already advanced and used the Chirp Sonar system on Taiwanese Research Vessels such as Ocean Researcher I (OR I) and Ta-Kuans TOPAS system. This paper presents the results of attenuation coefficients in ocean bottoms using the acoustic inversion technique on the chirp sonar data collected by OR I. The results are compared with the core data, and the error is within 15%.
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