The effect of depth on the target strength of a humpback whale (Megaptera novaeangliae)
| Autor: | Ruben Patel, Geir Pedersen, Leif Nøttestad, Andrew S. Brierley, Matteo Bernasconi |
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| Rok vydání: | 2015 |
| Předmět: |
Sound Spectrography
Time Factors Acoustics and Ultrasonics Acoustics Diving Oceans and Seas Fish species Research vessel Humpback whale Automation Motion Echo sounding Arts and Humanities (miscellaneous) biology.animal Animals Scattering Radiation Target strength Humpback Whale biology Whale Acoustic energy Signal Processing Computer-Assisted biology.organism_classification Oceanography Sound Geology Environmental Monitoring |
| Zdroj: | The Journal of the Acoustical Society of America. 134(6) |
| ISSN: | 1520-8524 |
| Popis: | Marine mammals are very seldom detected and tracked acoustically at different depths. The air contained in body cavities, such as lungs or swimbladders, has a significant effect on the acoustic energy backscattered from whale and fish species. Target strength data were obtained while a humpback whale (Megaptera novaeangliae) swam at the surface and dove underneath a research vessel, providing valuable multi-frequency echosounder recordings of its scattering characteristics from near surface to a depth of about 240 m. Increasing depth dramatically influenced the backscattered energy coming from the large cetacean. This study is tightly linked to the ultimate goal of developing an automated whale detection system for mitigation purposes. |
| Databáze: | OpenAIRE |
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