CORRELATION OF AMBIENT OCEAN NOISE WITH SEA STATE SPECTRAL DENSITY.
Final rept. Dec 65-Sep 67,
DOUGLAS AIRCRAFT CO INC LONG BEACH CALIF AIRCRAFT DIV
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The work is concerned with the measurement of ocean waves and ambient ocean noise by an instrumented free-floating buoy, transmitting of the data to a nearby ship for recording on magnetic tape, and the reduction and analysis of the data. A total of 36 recordings were obtained during the six sea trips conducted off the California coast in 700 fathoms of water. The duration of each measurement is nominally 20 minutes. Both analog and digital techniques were used in the analysis of the data. Analog methods employing an RMS averaging technique is preferred for analysis of ambient noise data. Digital methods are preferred for analysis of ocean wave data. Correlation of the data analyzed to date indicates an average increase in ambient ocean noise level at a 200 foot depth, of 3 db per foot-squared increase in sea state spectral density. Power spectral density plots of waves and ambient noise are included, in addition to a description of the buoy and instrumentation. Author
- Physical and Dynamic Oceanography