Can acoustic multipath explain finback (B. physalus) 20-Hz doublets in shallow water?

摘要: A broadband acoustic propagation code is combined with an empirically derived geoacoustic seafloor model for the purpose of interpreting finback doublet sequences recorded in northern Gulf California by Thompson et al. 1987 [Thompson al., J. Acoust. Soc. Am. 92, 3051–3057 (1992)]. The result that ranges less than 30 km, it plausible to explain appearance this environment terms multipath through water column and seafloor. For a channel depth as shallow 50 m, detection range subbottom arrival may exceed water-borne arrival. This have important implications accuracy hyperbolic localization algorithms which assume sound speed consistent path. When supported, interpulse delay demonstrated be strongly dependent. With prior knowledge environment, provide practical tool real-time passive ranging finbacks using only single hydrophone or sensor array. Scientists might consider impact multipath-induced has on long distance communication between whales based temporal cues encoded patterned 20-Hz pulse sequences.