Abstract
Techniques for determining modal attenuation coefficients and the compressional wave attenuation profile of the bottom in shallow water are presented. The required input data consist of measurements of the pressure field versus range due to a monochromatic point source. Several methods are described for obtaining modal attenuation coefficients from the pressure field or its Hankel transform (the depth-dependent Green's function versus horizontal wavenumber). These modal attenuation coefficients can be related to the bottom attenuation profile through an integral equation that can be solved using linear inverse theory. The method is demonstrated using synthetic noise-free and noisy data. The results of inverting experimental data from Nantucket Sound at 140 and 220 Hz are also described. Resolution and variance estimates for the bottom attenuation profile are presented. [Work supported by ONR.]
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