Effect of Internal Solitary Waves on Underwater Acoustic Propagation

摘要

Internal solitary waves (ISWs) were observed on 07:52-09:36 GMT July 30 2005, in the Philippine Sea near Taiwan from high-resolution temperature sampling. The effect of ISWs on acoustic propagation was identified using the Navy's Comprehensive Acoustic Simulation System through comparison between range-independent and range-dependent sound speed profiles. The ISWs enhance the sound propagation slightly (0-3 dB) in near-range, weaken or enhance the sound propagation evidently in midrange, and always weaken the sound propagation in far range. The ISW's effect on the acoustic propagation varies with sound frequency and sound source depth. This work provides a methodology to anticipate possible errors in transmission loss estimation in an operational framework, if no further additional data are available.