A reformulation of the Lambda-Phi diagram for the prediction of ocean acoustic fluctuation regimes

作者：Colosi John A^*

来源：Journal of the Acoustical Society of America, 2015, 137(5): 2485-2494.

DOI：10.1121/1.4916695

The Lambda - Phi diagram was a tool introduced in the late 1970s to predict ocean acoustic fluctuation regimes termed unsaturated, partially saturated, and fully saturated, where internal wave sound speed fluctuations play a dominant role. The Lambda - Phi parameters reflect, respectively, the strength of diffraction and the root-mean-square phase fluctuation along a ray path. Oceanographic knowledge of the small scale part of the internal wave spectrum and high angle Fresnel zone formulations now allow a more stable and accurate calculation of these parameters. An empirical relation between the variance of log-intensity and Lambda - Phi provides a more accurate border between the unsaturated regime and stronger fluctuations. The diagram is consistent with six short range, deep water experiments in the Pacific, Atlantic, and Arctic oceans with frequencies ranging from 75 to 16 000 Hz. The utility of the Lambda - Phi diagram is that it provides one of the few means to inter-compare experiments at different geographic locations, and at different frequencies and ranges.

• 出版日期2015-5