Abstract
Data from the ASIAEX East China Sea (ECS) experiment is used to estimate sediment attenuation coefficients as a function of frequency and depth. Modal amplitude ratios for modes in the frequency range 10 to 300 Hz are used to obtain the attenuation profiles. These inversions use broad-band data from wide band sources (WBSs) deployed in the area. The modes are detected, identified and their amplitudes measured using a time-frequency wavelet analysis. A joint inversion for attenuation coefficient profile, water depth, source and receiver depths, range and empirical orthogonal functions in the water column is performed. This inversion differs from our earlier technique in that instead of modal attenuation coefficients we treat the attenuation coefficient profile as the primary unknown. This enables us to reduce the number of unknowns and hence allows us to use higher modes in the inversion. Data from many WBS charges will be used to estimate an average value for attenuation and its standard deviation. The results will be compared with core data and frequency and depth dependence will be examined. [Work supported by ONR.]
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