### ASA 129th Meeting - Washington, DC - 1995 May 30 .. Jun 06

## 2pUW34. Some general properties of ray arrival sequences in an underwater
sound channel.

**Anatoly L. Virovlyansky
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*Inst. of Appl. Phys., 46 Ulyanov St., 603600 Nizhny Novgorod, Russia
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Some properties of ray arrival sequences valid in a waveguide with an
arbitrary sound-speed profile are ascertained using the simple approximate
formula connecting differences in ray travel times and adiabatic invariants of
their trajectories. It is noted that the following conservation law takes
place: The mean difference in travel times of rays having their launch angles
inside the fixed narrow angular interval does not depend upon the distance
between the source and the receiver. This law holds true not only in the
range-independent waveguide but in the adiabatically varying waveguide as well.
Some general conclusions concerning the relationship between travel times and
launch angles of rays reaching the receiver are made.