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WAVEGUIDE PROPAGATION ALLOWS RANGE ESTIMATES



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Research article Article de recherche WAVEGUIDE PROPAGATION ALLOWS RANGE ESTIMATES FOR NORTH PACIFIC RIGHT WHALES IN THE BERING SEA Sean M Wiggins1 Mark A McDonald2 Lisa M Munger1 Sue E Moore3 John A Hildebrand1 Scripps Institution of Oceanography 9500 Gilman Drive 0205 La Jolla CA 92093 0205 swiggins ucsd edu 2 Whale Acoustics 11430 Rist Canyon Road Bellvue CO 80512 3 NOAA National Marine Mammal Laboratory 7600 Sand Point Way NE Seattle WA 98115 1 ABSTRACT The shallow and uniform water depth of the eastern Bering Sea shelf results in an acoustic waveguide Propagation within this waveguide produces waveform dispersion which is dependent upon range We present a means for using dispersed waveforms to determine range to calling whales from a single autonomous acoustic recording instrument The predominant North Pacific right whale Eubalaena japonica call is frequency upswept from about 90 Hz to around 160 Hz and lasts approximately 1 s The regional bathymetry of the eastern Bering Sea middle shelf is relatively uniform and shallow 70 meters deep This geometry provides a plane layered waveguide in which right whale upswept calls can be detected at ranges over 50 km and have multiple modal arrivals that become dispersed displaying different propagation velocities for different frequencies Dispersion characteristics of modal arrivals are dependent on the calling whale s depth the receiver s depth the water depth the range from caller to receiver and various environmental parameters including water and sediment density and sound velocity A model of sound propagation for the eastern Bering Sea middle shelf is developed from right whale call dispersion recorded on sonobuoys and seafloor acoustic recording packages using individual calls recorded at multiple instruments After development of the model waveform dispersion allows estimation of caller range based on single instrument recordings Estimating range between instrument and calling whales provides a means to estimate



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