In:
Japanese Journal of Applied Physics, IOP Publishing, Vol. 39, No. 5S ( 2000-05-01), p. 3212-
Abstract:
Ocean acoustic tomography (OAT) using sound propagation times in
the o cean is a useful observation system to determine the actual
temperature of water. OAT needs an adequate numerical method of sound propagation to obtain the prior information about the
ocean. We reported about the wide-angle parabolic equation (PE) calculation method for long-range propagation. However, if the
ridges on a seabed exist near the SOund Fixing And Ranging (SOFAR) axis, it blocks sound pulses passing near the SOFAR axis. Sound
pulses are reflected not only in the vertical direction such as sea surface, but also in the horizontal direction because of ridges of
seabed. Two-dimensional (2-D) analysis of the sound pressure distribution many have a slight error behind ridges or
islands. Therefore, it is necessary to consider the sound propagation characteristics using the three-dimensional parabolic
equation (3-DPE) calculation method but the 2-DPE calculation method. We obtained accurate results for sound pressure distribution
on the SOFAR axis using 3-DPE calculation method, when the sound pulse was blocked by the seabed. The calculation results of
underwater characteristics by 3-DPE calculation were compared with those of the 2-DPE calculation method.
Type of Medium:
Online Resource
ISSN:
0021-4922
,
1347-4065
DOI:
10.1143/JJAP.39.3212
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
2000
detail.hit.zdb_id:
218223-3
detail.hit.zdb_id:
797294-5
detail.hit.zdb_id:
2006801-3
detail.hit.zdb_id:
797295-7
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