Fig. 14 The inverse result of the experiment
Fig. 14 lists the inverse result and the experiment data. The first picture describes the interval T in the multipath structures of the receive signal. The solid lines are measured by the experiment signal, while the dotted lines are computed by BDRM theory. The second picture describes the thermocline by the thermometer's measurement and by our inversion. The solid lines are the 25 centigrade line and 12 centigrade line. The dotted lines are the inversion result.
In Fig. 14, the solid lines match well with the dotted lines. Thus we get the result:
Result(3) The multipath structures can inverse the fluctuation of the thermocline.
5. CONCLUSION AND FURTHER WORK
Our experiment in Sep. 1997 in Yellow Sea shows that it is possible to use the multipath structures to monitor the tide. We finish the first step to prove the reasonability for our idea.
Further work need to be done in order to finish the research. The tasks of the further work are listed as following. Test our coupled BDRM codes with the experiment data, conduct new experiment for monitoring the internal wave and use coupled BDRM theory to inverse the internal wave in shallow water.
REFERENCE
[1] Ching-Sang Chiu, James H.Miller and James F. Lynch, Inverse Techniques for Coastal Acoustic Tomography, Theoretical and Computational Acoustics, Vol. 2, pp917-931.
[2] Zhang Renhe, Li Fenghua, Beam-Displacement Ray-Mode Theory of Sound Propagation in Shallow Water, Science in China (A), (accepted).
