Results from an autonomous underwater vehicle towed hydrophone array experiment in Nantucket Sound

Shallow water experiments have been conducted in Nantucket Sound with an autonomous underwater vehicle towed hydrophone array system in an area proximate to that of a previous experiment [Frisk and Lynch, J. Acoust. Soc. Am. 86, 1928-1939 (1989)]. Transmission loss was measured, for frequencies between 220 and 1228 Hz in an ocean waveguide, under conditions of an isovelocity water column with an approximate depth of 13 m over a sandy-silty bottom. Results obtained at 415 Hz show classic isovelocity waveguide phenomena that include interference effects, mode stripping due to modal attenuation, and transmission loss proportional 15 to 10 log(10)(R). (c) 2006 Acoustical Society of America.