Temporal coherence of mode arrivals

Temporal coherencies are compared for individual pulse arrivals of 100 and 800 Hz centered broadband signals propagating through identical shallow channels during periods of low and high internal wave energy. All 100 Hz modes are clean, distinct in time, and remarkably coherent ( t coh > 1 h ) ....

Full description

Saved in:
Bibliographic Details
Published in:The Journal of the Acoustical Society of America 2008-09, Vol.124 (3), p.EL104-EL109
Main Authors: DeFerrari, Harry A., Lynch, James F., Newhall, Arthur
Format: Article
Language:English
Subjects:
Acoustics
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Geologic Sediments
Models, Theoretical
Motion
Oceans and Seas
Physics
Radar
Sound
Sound Spectrography
Temperature
Time Factors
Underwater sound
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Temporal coherencies are compared for individual pulse arrivals of 100 and 800 Hz centered broadband signals propagating through identical shallow channels during periods of low and high internal wave energy. All 100 Hz modes are clean, distinct in time, and remarkably coherent ( t coh > 1 h ) . A near continuum of modes is observed for the 800 Hz signal with much shorter coherence times. Higher order modes are less coherent. Internal wave scattering appears to dominate the 100 Hz signals, whereas bottom scattering also randomizes the 800 Hz signal. Observations are consistent with similar measurements for this and other sites for intermediate frequencies.
ISSN:0001-4966
1520-8524
DOI:10.1121/1.2968304