Abstract
An experiment is described that was conducted to provide an empirical evaluation of attenuation in sea water in the frequency decade of 354 to 3540 cps. Recordings were made of SOFAR shots detonated every 5 miles along a 500-mile track employing receiving elements located near the axis of the SOFAR channel. An analysis is outlined both in terms of received energy spectrum and transmission loss as a function of range. The experimental data have been statistically fitted by least-squares methods to a number of mathematical models of the general form Nw=H0+10n log R+aR, where H0 represents the transmission loss in excess of a geometrical spreading specified by 10n logR. A selection made from these various results on the basis of significance in terms of ray acoustics is finally compared with other published results.
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