The Fast Field Program (FFP) and Attenuation Loss in Hudson Bay

The Fast Field Program (FFP) was developed to provide rapid, accurate, propagation-loss predictions for a generalized environmental model. This report demonstrates the utility of the FFP, in a different capacity, as a research tool to investigate the sound attenuation in a water column. Hudson Bay w...

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Bibliographic Details
Main Authors: DiNapoli, Frederick R., Powers, Mary R.
Other Authors: NAVAL UNDERWATER SYSTEMS CENTER NEWPORT RI
Format: Text
Language:English
Published: 1972
Subjects:
Acoustics
*SOUND TRANSMISSION
*UNDERWATER SOUND
VELOCITY
MATHEMATICAL MODELS
ANOMALIES
OCEAN BOTTOM
UNDERWATER SOUND SIGNALS
HUDSON BAY
ACOUSTIC PROPERTIES
LOW FREQUENCY
ATTENUATION
SHALLOW WATER
MATHEMATICAL PREDICTION
*UNDERWATER SOUND TRANSMISSION
VELA UNIFORM
MOST PROJECT-2
Hudson
Hudson Bay
Online Access:http://www.dtic.mil/docs/citations/AD0743065
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0743065
Description
Summary:The Fast Field Program (FFP) was developed to provide rapid, accurate, propagation-loss predictions for a generalized environmental model. This report demonstrates the utility of the FFP, in a different capacity, as a research tool to investigate the sound attenuation in a water column. Hudson Bay was selected as the area of application because the results of propagation experiments conducted there during August 1970 were available and interesting. The experimentally determined values of the attenuation coefficient for the frequency band 315 to 1600 Hz were found to exceed the values that would be predicted from existing formulas based on empirical relationships. The possibility that this anomalous behavior could have been due to energy leakage into the bottom is examined, and the values of the attenuation coefficient determined from the FFP analysis are compared with experimental results.

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