Acoustic wave propagation and scattering in turbulence and internal waves.

Abstract

Acoustic wave propagation and scattering in turbulence and internal waves in Kanmon Strait and the outer New Jersey shelf are measured in a bistatic source-receiver configuration at frequency 5500 Hz. While internal wave dominates on the open New Jersey shelf, the turbulence dominates in the Kanmon Strait channel. Initially strong internal wave scattering is reduced rapidly due to strong mixing in the shallow strait. On the flat and open continental shelf, internal wave and warm water intrusion dominate while turbulence is near absent. The parabolic equation code predictions agree with data very well. The bistatic scattering data are processed for bistatic angles and the effects of Doppler shift on the mean flow and the broadening of peek spectra on the turbulent fluctuations. The mean flow and turbulence fluctuation obtained from the Doppler shift agreed with the two parameters obtained by the reciprocal acoustic transmission.