Accession Number : ADA293240

Title :   Shallow Water Ambient Noise Caused by Breaking Waves in the Surf Zone.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Stewart, Marc S.

PDF Url : ADA293240

Report Date : DEC 1994

Pagination or Media Count : 101

Abstract : Omnidirectional ambient noise measurements acquired in Monterey Bay, California were applied with modelled Transmission Loss (TL; to calculate the spectral source level of surf-generated noise. A full geoacoustic model of the coastal environment was assembled and used in the Finite Element Parabolic Equation propagation loss model to obtain transmission loss values for this calculation A unitorm 12.5 km linear effective source length was assumed. Estimates of wind and wave noise were subtracted from observed levels to determine the contribution due to surf. TL estimates show that surf noise propagation has some dependence on the geoacoustic environment and on frequency. At 300 Hz a 5 dB difference was noted between estimated TL 5 km from the Ft. Ord beach and estimated TL 5 km from the Pt. Pinos beach. (MM)

Descriptors :   *OCEAN WAVES, *GEOACOUSTICS, *AMBIENT NOISE, *SURF, DENSITY, COASTAL REGIONS, HIGH VELOCITY, THESES, SHALLOW WATER, SPECTRA, WIND VELOCITY, CALIFORNIA, NOISE, AIR WATER INTERACTIONS, DEEP WATER, OCEAN BOTTOM, SHIPPING, TRANSMISSION LOSS, BAYS, OMNIDIRECTIONAL.

Subject Categories : Physical and Dynamic Oceanography
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE