Experimental and Numerical Studies of Sound Propagation over a Submarine Canyon Northeast of Taiwan
A study of sound propagation over a submarine canyon northeast of Taiwan was made using mobile acoustic sources during a joint ocean acoustic and physical oceanographic experiment in 2009. The acoustic signal levels (equivalently, transmission losses) are reported here, and numerical models of 3-D sound propagation are employed to explain the underlying physics. The data show a significant decrease in sound intensity as the source crossed over the canyon, and the numerical model provides a physical insight into this effect. In addition, the model also suggests that reflection from the canyon seabed causes 3-D sound focusing when the direction of propagation is along the canyon axis, which remains to be validated in a future experiment. Environmental uncertainties of water sound speed, bottom geoacoustic properties, and bathymetry are addressed, and the implications for sound propagation prediction in a complex submarine canyon environment are also discussed
Journal or Conference Title
IEEE Journal of Oceanic Engineering
Y. - T. Lin, Duda, T. F., Emerson, C., Gawarkiewicz, G. G., Newhall, A. E., Calder, Brian R., Lynch, J. F., Abbot, P., Yang, Y. - J., and Jan, S., “Experimental and Numerical Studies of Sound Propagation over a Submarine Canyon Northeast of Taiwan”, IEEE Journal of Oceanic Engineering, vol. 40(1). IEEE, pp. 237-249, 2015.