Accession Number : AD0757682

Title :   An Analysis of Environmental Data for Use in Updating Low Frequency Propagation Loss Forecasts.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF

Personal Author(s) : Harvey,Phillip Ivan

Report Date : DEC 1972

Pagination or Media Count : 181

Abstract : An acoustic model for low frequency (100-2400 HZ) propagation loss within a surface duct is examined. An analysis of the sensitivity of this model as a function of the governing environmental parameters is performed. The results of this analysis show that the frequency and mixed layer depth are influential over a wide range of environmental conditions and that the below layer thermal gradient becomes important at low frequencies when the layer depth is relatively shallow. Under certain conditions, a change in below layer thermal gradient of 2F/100 FT has the same resultant effect as a 25 FT change in the mixed layer depth. (Author Modified Abstract)

Descriptors :   (*UNDERWATER SOUND GENERATORS, *SOUND TRANSMISSION), (*ANTISUBMARINE WARFARE, UNDERWATER SOUND GENERATORS), UNDERWATER SOUND, PROPAGATION, OCEAN CURRENTS, TRANSITION TEMPERATURE, OCEAN BOTTOM, HYDROPHONES, ACOUSTIC RANGES, THESES

Subject Categories : Electrical and Electronic Equipment
      Undersea and Antisubmarine Warfare
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE