Naval Res. Lab., Washington, DC 20375
Matched-field processing has recently been applied to the determination of a wide variety of environmental parameters. However, nearly all efforts have been directed toward determining those parameters along a 2-D swath through the environment. The approach developed for the tomographic 3-D calculation of deep ocean sound-speed profiles [Tolstoy et al., J. Acoust. Soc. Am. 89, 1119--1127 (1991); Tolstoy, J. Acoust. Soc. Am. 91, 781--787 (1992)] has now been adapted for the determination of bottom properties, i.e., sediment thicknesses, sound speeds, and densities. The inversion technique will be discussed and calculations in shallow water environments, where bottom properties are of paramount importance, will be presented.