| Autor: |
Mitchell, Stephen K., Focke, Karl C. |
| Zdroj: |
Journal of the Acoustical Society of America; 1983, Vol. 73 Issue 2, p465-473, 9p |
| Abstrakt: |
The effect of the seabottom upon acoustic propagation in the frequency range from 20 to 2000 Hz in shallow water is analyzed. In particular, the role of depth and frequency variations of attenuation is considered. The point of view that attenuation in the seabottom varies linearly with frequency and changes with depth is taken. Normal mode calculations which demonstrate the interplay between depth variations of attenuation and the frequency dependence of propagation loss and mode attenuation coefficients are presented. It is shown that, if in the course of data analysis, attenuation were erroneously constrained to be constant with depth, then a nonlinear estimate for frequency dependence of attenuation could result. Calculations based upon attenuation profiles from the geophysical literature are compared with reported propagation loss data from the acoustics literature. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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