Accession Number:

ADA247578

Title:

The Curtain Effect in a Shallow Water Environment

Descriptive Note:

Technical document

Corporate Author:

NAVAL UNDERSEA WARFARE CENTER NEWPORT DIV NEW LONDON CT NEW LONDON DETACHMENT

Personal Author(s):

• Browning, D. G.
• Christian, R. J.
• Herstein, P. D.
• Monti, J. M.

Report Date:

1992-03-03

Pagination or Media Count:

19.0

Abstract:

The curtain effect that controls sound propagation in a sound channel Browning, et al., J. Acoust. Soc. Am. Suppl. 1 88, S132 1990 is shown to exist in modified form for severely bottom-limited propagation conditions that can exist in shallow water during the summer. The initially dominant loss component, whose rate decreases with range, is now angular-dependent multiple bottom bounce propagation loss. The range-independent component is an effective attenuation that includes low-angle bottom loss. The transition between these components is equivalent to the crossover of the components in the sound channel case. An effective range can be obtained by extending the effective attenuation component back to the intersection with the rate of spreading loss component. Illustrations are given for several shallow water areas.

Descriptors:

• *SHALLOW WATER
• *WAVE PROPAGATION
• *UNDERWATER ACOUSTICS
• ANGLES
• PROPAGATION
• SOUND
• BOTTOM
• SUMMER
• LOW ANGLES
• BOTTOM BOUNCE
• BOTTOM LOSS
• TRANSMISSION LOSS
• CHANNELS
• TRANSITIONS
• ATTENUATION
• WATER
• ACOUSTIC WAVES
• RATES

Subject Categories:

• Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE