Abstract
The Acoustic Characterization Test III was performed in the oceanographically complex Strait of Korea to provide accurate measurements of sound transmission and coherence (array signal gain) under known environmental conditions. Bottom sampling and sub-bottom surveys, coupled with archival geophysical information, provided the basis for geoacoustic profiles of sound speed, density, and attenuation versus depth. These profiles and the measured bathymetry and water sound speed were used as input parameters for parabolic equations computations. Very good agreement was obtained between measured and calculated narrow-band transmission loss by employing slightly modified geoacoustic profiles and an attenuation profile with a near-water-sediment interface power-law frequency dependence of 1.8. This power law was determined through the use of an effective attenuation coefficient and a least-square analysis of transmissions from five narrow-band tones between 47 and 604 Hz. These results are consistent with measurements in other sandy–silty areas. Using these parameters, comparisons were made between independent measurements and calculations of broadband transmissions and of signal spread, and excellent agreement was found. [Work supported by ONR.]
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