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ON THE CRITERION OF ADIABATICITY IN THE COUPLED MODE THEORY |
| SHANG Erchang;WANG Yunyu |
| Institute of Acoustics, Academia Sinica, Beijing |
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| Cite this article: |
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SHANG Erchang, WANG Yunyu 1986 Chin. Phys. Lett. 3 153-156 |
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Abstract In the present paper, it is pointed out that there are two catagories of adiabatic approximation. within the propagation distance the range-dependent variation of the waveguide may be accummulative (1) or nonaccummula-tive (2). The well-known criterion given by Milder is applicable for the first catagory. The criterion for the second catagory has been derived by the present authors. Two example are discussed, (1) a shallow water waveguide with slight surface roughness and (2) a shallow water waveguide with range-dependent sediment properties.
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Published: 01 April 1986
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