Effect of Surface Duct on Pulses Propagating in a Sound Channel in the Ocean
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概要
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In ocean acoustic tomography, unexpected changes in the travel time of acoustic pulses can sometimes be observed. It is considered that the possible causes are internal waves, layered sound speed microstructures and surface ducts. In this paper, we analyze the effect of a surface duct on a pulse that is propagating in a sound channel in the ocean by using the parabolic equation (PE) method. The received pulses change sensitively when a surface duct exists above the sound source or the receiver that is located around the axis of the sound channel. It has little effect on the pulses when it is located in the area between the source and the receiver. Consequently, one should pay attention to the sound speed profile near the surface above the source and the receiver in ocean acoustic tomography.
- 2001-05-30
著者
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TSUCHIYA Toshio
Japan Marine Science and Technology Center
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Futa Kohji
Simulation Systems Division Mitsubishi Precision Co. Ltd. (mpc)
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Ando Keizo
Simulation Systems Division Mitsubishi Precision Co. Ltd. (mpc)
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Kikuchi Toshiaki
Deparment Of Applied Physics The National Defense Academy
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Kikuchi Toshiaki
Department of Applied Physics, National Defense Academy (NDA), 1-10-20 Hashirimizu, Yokosuka-shi, Kanagawa 239-8686, Japan
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Ando Keizo
Simulation Systems Division, Mitsubishi Precision Co., Ltd. (MPC), 345 Kami-Machiya, Kamakura-shi, Kanagawa 247-8505, Japan
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Futa Kohji
Simulation Systems Division, Mitsubishi Precision Co., Ltd. (MPC), 345 Kami-Machiya, Kamakura-shi, Kanagawa 247-8505, Japan
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Tsuchiya Toshio
Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka 237-0061, Japan
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