Abstract
Based on the beam-displacement ray-mode (BDRM) sound propagation model, the effect of the bottom reflection coefficient on the pulsed waveform structure in shallow water with a thermocline is discussed. Simulated numerical calculations show that in shallow water with a thermocline, the bottom reflection amplitude and the bottom reflection phase can be inverted by the envelope of the pulsed waveform and the pulsed waveform structure, respectively, when the source and/or the receiver are above the thermocline. Using the experimental data from ’96 China–US Far Yellow Sea Experiment, inversions for bottom reflection amplitude and reflection phase are performed. The waveform correlation between the experimental waveform and the inversion waveform is about 0.88 while the envelope correlation between them is about 0.95. The inversion of the experimental data shows that the inversion for the bottom reflection coefficient is effective and the inversion results are stable when the source and/or the receiver are above the thermocline. [Work supported by NSF of China and ONR of USA.]
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