Y. Y. Wang
E. C. Shang
CIRES, Univ. of Colorado/NOAA/Environmental Technol. Lab., Boulder, CO 80303
Naval Underwater System Ctr., New London, CT 06320
In a previous paper [D. Lee et al., J. Acoust. Soc. Am. 91, 3192--3202 (1992)], a three-dimensional effect on acoustic wave propagation has been examined by using a propagation model with azimuth-coupling capability (FOR3D). It has been found that a significant three-dimensional effect on transmission loss (TL) takes place at the Atlantic shelf area with bottom topography variations given by the Harvard open ocean model (HOOM). In this talk, some results are reported of the investigation of the three-dimensional effect on modal travel time under the same oceanic environment by using the scheme of modal spectrum of the PE field (MOSPEF).