AMBIENT NOISE STUDIES. BIMINI, BAHAMAS - 1967-1968.
Abstract
During a 72 day period, 18 February to 2 May 1967, ambient noise and in situ environmental parameters were sampled at 12 minute intervals off the coast of Bimini, Bahamas. The resulting time series were analyzed by spectral and cross spectral methods. There was no significant correlation between noise data at frequencies of 25 and 100 Hz, with wind speed up to 28 knots or wave height up to 6 feet. At frequencies of 400 and 1600 Hz, the ambient noise levels shows a strong correlation with wind speed and wave height. Wind speed is shown to be the predominant factor and wave height is secondary in the production of higher frequency noise. Wave height is found to be strongly correlated to wind speed and current and temperature measurements exhibit some weak correlation with wind speed for low frequency fluctuations, i.e., below three days. High frequency periodicities of 8, 6, 4.8, 4 and 3 hours were found in the 400 and 1600 Hz records. These are thought to be harmonics of the 24 hour occurrence of a large rise in ambient noise level occurring at 2100 hours, which is produced by biological sources of unknown origin. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1968
- Accession Number
- AD0694038
Entities
People
- Harry A. Deferrari
- W. C. Green
Organizations
- University of Miami